After decades of the US government generally avoiding discussion of UFOs, NASA and the Department of Defense have embarked on investigations into mysterious, unexplained sightings, aerial or otherwise: what are now being dubbed unidentified anomalous phenomena, or UAPs. NASA launched a nine-month UAP investigation in October. In the spirit of the space agency’s goal of transparency for that work, on Wednesday it live-streamed a public meeting of its independent UAP study team. The panel concluded it needed quality data, noting the fragmentary nature of what was available to analyze has restricted research into UAPs.  

The subject of UAPs “has captured the attention of the public, the scientific community, and the government alike,” said Daniel Evans, assistant deputy associate administrator for research at NASA’s Science Mission Directorate, at the meeting’s outset. “It’s now our collective responsibility to investigate these occurrences with a rigorous scientific scrutiny that they deserve.” 

The 16-person study group includes planetary scientist David Grinspoon, former NASA astronaut Scott Kelly, and science journalist Nadia Drake. It’s chaired by David Spergel, an astrophysicist and president of the nonprofit science organization the Simons Foundation.

[Related: Is the truth out there? Decoding the Pentagon’s latest UFO report.]

The NASA team will write a final report by sometime in July. The study team’s mission is not to render a verdict on the nature of UAPs, Spergel said, but to set the stage for later research. They aim to clarify how NASA can go about scientifically investigating UAPs. To that end, in Wednesday’s meeting, they discussed the current knowledge about UAPs (these are not extraterrestrial), standards of evidence for determining just what they might be, and the difficulty of obtaining high-quality human reports. 

“Our role here is not to resolve the nature of these events, but rather to give NASA guidance to provide a roadmap of how it can contribute to this area,” Spergel said. 

The team has sifted through available UAP data and found that many reports can be pinned down to known sources, such as distant aircraft, sensor artifacts, high altitude balloons, or atmospheric events. When it comes to learning more about the persistently unidentifiable phenomena on record, though, the team found the information lacking. 

“The current data collection efforts regarding UAPs are unsystematic and fragmented across various agencies, often using instruments uncalibrated for scientific data collection,” Spergel said. “Existing data and eyewitness reports alone are insufficient to provide conclusive evidence about the nature and origin of every UAP event.”

[Related: The truth about Area 51 UFO sightings, according to a local expert]

It’s possible that more direct, targeted observations of UAPs could help, using everything from FAA radar installations to sensors on commercial aircraft to government spy installations. But as Sean Kirkpatrick, the director of the Department of Defense’s All-domain Anomaly Resolution Office (AARO) told the team, “Most people, including the government, don’t like it when I point our entire collection apparatus to your backyard.”

“We’ve got to figure out how to do this only in the areas that I can get high confidence there’s going to be something there,” Kirkpatrick continued, “and high confidence I’m not going to break any laws.”

While AARO may deal with some classified UAP data, the NASA team is only working with unclassified information so that its report can be made fully public. But that doesn’t necessarily mean that the data NASA has to work with is inferior to the Department of Defense’s information—many times, the classification of a UAP sighting has nothing to do with UAPs, according to Nicola Fox, associate administrator of NASA’s Science Mission Directorate, and everything to do with what snapped the photo.

“Unidentified anomalous phenomena sightings themselves are not classified. It’s often the sensor platform that is classified,” she said, to prevent foreign adversaries from understanding those sensor’s capabilities. “If a fighter jet took a picture of the Statue of Liberty then that image will be classified, not because of the subject in the picture, but because of the sensors on the plane.”

There are drawbacks for the NASA investigators working in public, however. Although he did not specify exactly what happened, Evans noted that members of study team “have been subjected to online abuse due to their decision to participate on this panel,” adding that “any form of harassment towards our panelists only serves to detract from the scientific process, which requires an environment of respect and openness.”

Harassment of NASA study team members also highlights another problem with seriously studying UAPs, according to Spergel: the stigma associated with reporting a UAP sighting, especially among some professionals. ”Despite NASA’s extensive efforts to reduce the stigma, the origin of the UAPs remain unclear, and we feel many events remain unreported,” he said. “Commercial pilots, for example, are very reluctant to report anomalies, and one of our goals in having NASA play a role is to remove stigma and get high quality data.”

The post UFO data is honestly a mess, NASA panel says appeared first on Popular Science.

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Those of us in the Northern Hemisphere are enjoying the longest daylight hours of the year ahead of the summer solstice, and across the world many may even be able to see a unique sunspot on the surface of our favorite star.  Summer stargazing season is quickly approaching, but summer skies can be hazy which makes  some celestial events difficult to see. But there is still plenty to see in the mild night skies this June. Here are some events to look out for and if you happen to get any stellar sky photos, tag us and include #PopSkyGazers.

[Related: The Strawberry Moon, explained.]

June 1 and 2- Mars passes through Beehive star cluster

To kick off the month, Mars will be passing through a star cluster called the Beehive cluster or M44. It’s located in the crabby constellation Cancer, and Mars will appear as a brilliant red ruby surrounded by sparkly diamonds.  

To find Mars, first look for the bright planet Venus in the western sky. The two bright stars that are strung out to one side of Venus are the constellation Gemini’s twin stars Castor and Pollux. Mars should be the reddish light just above Venus, Pollux, and Castor. Binoculars and a dark sky will help you see a smattering of stars just beside Mars. 

The Beehive cluster is about 557 light-years away from Earth and is home to at least two planets. 

June 3 and 4- Full Strawberry Moon

June’s full moon will reach peak illumination at 11:43 PM EDT on June 3. Just after sunset, look in the southeastern sky to watch the moon rise above the horizon. June’s full moon is typically the last full moon of the spring or the first of the summer. 

The name Strawberry Moon is not a description of its color, but instead a reference to the ripening of “June-bearing” strawberries that are ready to be gathered and gobbled. For thousands of years, the  Algonquian, Ojibwe, Dakota, and Lakota peoples used this term to describe a time of great abundance. Some tribal nations in the northeastern US, including the Wampanoag nation, celebrate Strawberry Thanksgiving to show appreciation for the spring and summer’s first fruits. 

Other names for June’s full moon include the Gardening Moon or Gitige-giizis in Anishinaabemowin (Ojibwe), the Moon of Birthing or Ignivik in Inupiat, and the River Moon or Iswa Nuti in the Catawba Language of the Catawba Indian Nation in South Carolina.

[Related: See hot plasma bubble on the sun’s surface in powerful closeup images.]

June 21- Summer Solstice

Summer officially begins in the Northern Hemisphere at 10:58 AM EDT on June 21 which marks the summer solstice. This is when the sun travels along its northernmost path in the sky. At the solstice, Earth’s North Pole is at its maximum tilt of roughly 23.5 degrees towards the sun. It is also the longest day of the year, and you can expect roughly 16 hours of daylight on June 21 in some spots in the Northeast.

After June 21, the sun appears to reverse course and head back in the opposite direction, towards the south, until the next solstice in December. 

June 27- Bootid Meteor Shower Maximum

June’s Bootid meteor shower begins on June 22, but it is expected to reach its peak rate of meteors around 7 PM EDT on June 27. The Bootid meteors should be visible when the constellation Bootes is just above the horizon. The moon will be in its first quarter phase at the shower’s peak, and will set at about 1:30 in the morning, making for minimal light interference later in the night. 

June’s Bootid meteor shower was created by the comet 7P/Pons-Winnecke and expected to last until July 2.

The same skygazing rules that apply to pretty much all space-watching activities are key this month: Go to a dark spot away from the lights of a city or town and let the eyes adjust to the darkness for about a half an hour. Then, just sit back and let the summer skies dazzle.

The post A Strawberry Moon, solstice, and meteor shower will dance across the skies this June appeared first on Popular Science.

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Best overall		Celestron Inspire 100AZ		SEE IT	This lightweight telescope is also easy to assemble and comes with a carrying case.
Best for travel		Gskyer 70mm Aperture 400mm AZ Mount Astronomical Refractor Telescope		SEE IT	This telescope lets kids take pictures with their phones and is great for camping.
Best budget		MaxUSee Kids Telescope 400x40mm with Tripod & Finder Scope		SEE IT	Comes with a moon filter and maps of the moon and stars—at a wallet-friendly price.

While trips to the Moon may not be commonplace yet, you can foster curiosity about the universe by letting kids see the lunar surface and the rings of Saturn up close with a telescope for kids. It’s one thing to learn about the Moon in school, and it’s another thing to see it up close. The best telescopes for kids are designed for amateur astronomers, and can provide night after night of out-of-this-world entertainment.

• Best overall: Celestron Inspire 100AZ
• Best for young kids: Celestron FirstScope 76 Tablestop Telescope 
• Best for older kids: Celestron Astro Fi 102 WiFi Maksutov Wireless Reflecting Telescope
• Best for travel: Gskyer 70mm Aperture 400mm AZ Mount Astronomical Refractor Telescope
• Best for smartphone photography: POPULAR SCIENCE AstroMaster 80mm – Portable Refractor Telescope
• Best budget: MaxUSee Kids Telescope 400x40mm with Tripod & Finder Scope

How we chose the best telescopes for kids

Popular Science covers the latest developments in astronomy, from stunning images from the James Webb Space Telescope’s discovery of its first exoplanet to meteor showers you can see from your backyard. Telescopes are a great way to help kids explore the galaxy and see the planets up close. But they can also be complicated instruments with many moving parts for the uninitiated.

In compiling our list of recommendations for the best telescopes for kids, we considered models from trusted brands like Celestron, optical quality and magnification, ease of set up and use, supplemental educational tools that explain what to look for in the night sky, durability, and portability. We also weighed user reviews, what kids look for at different ages, and prices.

The best telescopes for kids: Reviews & Recommendations

Looking for a telescope for the first time can be a daunting experience. Many of the considerations are the same finding telescopes for adults. Figuring out what type of telescope is best for your needs, what aperture you should look for, and the relationship between focal length and magnification are all important factors to consider. The best telescopes for kids should also be durable and easy to use. We break down what you should look for and our picks so you can compare telescopes and find the best option for your family.

Best overall: Celestron Inspire 100AZ

Celestron

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Specs

• Weight: 12.4 pounds
• Eyepieces: 10mm and 20mm
• Aperture: 100mm
• Type: Refractor

Pros

• Good for both stargazing and birdwatching
• Wide aperture for better focus
• Comes with smartphone adapter
• Plenty of training resources

Cons

• Some users say the build quality is not great

Celestron has been making telescopes for nearly 60 years. Its Inspire AZ100 is a great tool for older kids (and adults) to start stargazing at night and observing objects on Earth during the day. 

This short refractor telescope is a good telescope for beginners as it’s easy to set up and doesn’t require any special tools. Its short optical tube of 436mm provides a wide field of view, while its higher 100mm aperture allows aspiring astronomers to focus on the planets, moons, and stars. At 12.4 pounds, this telescope is relatively lightweight, and it comes with a tripod that’s easy to adjust. The AZ1000’s alt-az mount allows users to move the telescope up and down and pan left and right. 

The 10mm and 20mm eyepieces increase magnification by 33 times and 66 times, respectively. A finderscope makes it easier for beginning astronomers to spot the surface of the Moon. And your purchase also gives you access to Celestron’s Starry Night software, which teaches kids about what they see in the night sky. This telescope is also equipped with a smartphone adapter that allows kids to capture images of both the planets and wildlife.

Best for young kids: Celestron FirstScope

Celestron

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Specs

• Weight: 4.5 pounds
• Eyepieces: 4mm and 20mm
• Aperture: 76mm
• Type: Dobsonian/Newtonian

Pros

• Easy to use
• Portable
• Less expensive

Cons

• Small aperture

Designed for kids from ages 4 to 8, Celestron’s FirstScope is an ideal introductory telescope. Inspired by Galileo, this telescope features the names of he and other esteemed astronomers through the ages on its optical tube. This telescope comes with 20mm and 4mm eyepieces that result in magnification of 15 times and 75 times, respectively. The FirstScope is also light and easy to transport at 4.5 pounds. Its tabletop design makes it simple to set up on level surfaces outdoors. It’s a good telescope for a 5-year-old kid, and when the child is done stargazing, it looks great on a bookshelf.

Best for older kids: Celestron Astro Fi 102 WiFi Maksutov Wireless Reflecting Telescope

Celestron

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Specs

• Weight: 16.8 pounds
• Eyepieces: 25mm, 10mm
• Aperture: 125mm
• Type: Schmidt-Cassegrain

Pros

• Works with smartphones and iPads
• WiFi-enabled
• Lens cap doubles as a smartphone adapter

Cons

• Challenging to use if WiFi connection is spotty
• Some users report difficulty focusing

To get kids who are always on their devices interested in the Andromeda Galaxy, consider the Celestron Astro Fi 102 WiFi Maksutov Wireless Reflecting Telescope. Kids can control the WiFi-enabled telescope using an iPhone, iPad, or Android device and Celestron’s SkyPortal app, making this a good teen telescope. Instead of searching the night sky for planets, teens can use this telescope’s interactive sky map to tap the object they want to see on their screen. Then the telescope will move to find the object and focus upon it.

Set up is easy, and at 16 pounds with an adjustable tripod, this telescope is quite portable. Its two eyepieces (25mm and 10mm) provide magnification of 50 times and 125 times, respectively. That power will help kids locate the rings of Saturn, the red spot on Jupiter, the craters on the Moon at night, and wildlife and birds during the day. And the lens cap doubles as a smartphone adapter so that kids can show off images of their cosmic and terrestrial explorations.

Best for travel: Gskyer 70mm Aperture 400mm AZ Mount Astronomical Refractor Telescope

Gskyer

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Specs

• Weight: 5.73 pounds
• Magnification: 25mm, 10mm
• Aperture: 70mm
• Type: Refractor

Pros

• Lightweight
• Strong magnification
• Comes with smartphone adapter

Cons

• Some users say its poorly made
• May not locate celestial objects as well as other telescopes

This beginner’s telescope from Gskyer is designed for portability. This compact model weighs just under 6 pounds and comes with a travel case and an adjustable tripod so kids can take it on the go. The magnification power of the two eyepieces (25mm and 10mm) increase magnification by 16 times and 40 times, respectively, which can then be tripled using the included 3x Barlow lens. The Gskyer also comes with a smartphone eyepiece adapter so your kids can take photos of their discoveries, making it a solid telescope for 10-year-olds and other kids around that age.

Best for smartphone photography: POPULAR SCIENCE AstroMaster 80mm – Portable Refractor Telescope

Celestron

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EDITOR’S NOTE: Popular Science has teamed up with Celestron on a line of products. The decision to include this model in our recommendations was made by our reviewer independently of that relationship, but we do earn a commission on its sales—all of which helps power Popular Science.

Specs

• Weight: 10 pounds 
• Magnification: 20mm and 10mm
• Aperture: 70mm
• Type: Refractor

Pros

• High-quality optics
• Can operate it remotely
• Comes with educational software

Cons

• Some users said components arrived broken

If your kid is a budding photographer who’s looking to capture images of the planets, the AstroMaster 80mm is a great option.  A collaboration between Celestron and Popular Science, this telescope combines high-quality optics, including an 80mm objective lens, with a smartphone adapter that allows users to take photos and videos of the Moon, planets, and birds through the eyepiece. This refractor model comes with two eyepieces (20mm and 10mm) and a Barlow lens that doubles its magnification power. It also features an erect image diagonal that allows you to use it to spot wildlife and other terrestrial objects during the day. 

This telescope allows you to connect via Bluetooth and control the shutter release remotely on both iOS and Android phones. It’s also easy to assemble and super portable at 10 pounds. And kids can get a primer on the night sky with Celestron’s Starry Night Astronomy software, which provides sky maps and details about thousands of celestial objects.

Best budget: MaxUSee Kids Telescope 400x40mm with Tripod & Finder Scope

MaxUSee

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Specs

• Weight: 1.9 pounds
• Eyepieces: 20mm, 12.5mm, 6mm
• Aperture: 40mm
• Type: Refractor

Pros

• Lightweight
• Inexpensive
• Comes with viewfinder scope

Cons

• Lenses not powerful 
• No connectivity

The maps of the moon and stars are a big hit with kids, and adults will love the price of these budget-friendly telescopes. With easy assembly and included moon filter, the MaxUSee telescope is a good tool to get your child stargazing. That said, its eyepieces are not very powerful and it doesn’t come with a lot of features, so if having a good quality telescope that you can use for years is important, this may not be the best option.

Things to consider before purchasing a telescope for kids

If you’ve purchased cameras before, some terminology around lenses and light will be familiar. While telescopes can be incredibly intricate, when it comes to finding the best telescopes for kids, look for options that are easy to set up and use, durability, and lightweight for easy portability.

Type of telescope

There are three main types of telescope: refracting, reflecting, and catadioptric.

Refractor: These telescopes use both an objective lens and an eyepiece to display an image. Light enters the telescope and is bent or refracted as it travels through the optical tube. The eyepiece then magnifies the light and straightens out the image for the viewer.

Reflector: Reflecting telescopes use mirrors to bring an image into focus. These telescopes typically have a primary mirror opposite the aperture, where light comes into the telescope, and a secondary mirror. The light is reflected from the second mirror toward the eyepiece for the viewer to see the image. 

Catadioptric: These telescopes are designed with both lenses and mirrors to show an image, combining refraction and reflection. One of the categories of this type of telescope is known as Schmidt-Cassegrain.

Focal length, magnification, and aperture

The focal length of a telescope is the distance between where the telescope’s main lens or mirror and where light enters the telescope. It can range between 300 and 4,000 millimeters. The shorter the focal length, the wider the field of view. Conversely, higher focal lengths provide greater magnification to focus on a specific object.

To find out the magnification of a telescope using a specific eyepiece, divide the focal length of the optical tube by the eyepiece.  

Aperture: A telescope’s aperture indicates the diameter of the objective lens or mirror in millimeters. The larger the aperture, the more light the telescope can let in, making images brighter and easier to see.

Mounts

The three categories of mounts of telescopes are Altazimuth, Dobsonian, and Equatorial. Alt-az mounts, as they are also known, refer to the horizontal and vertical axes. They allow users to move the telescopes left and right and up and down on a tripod. Dobsonian mounts are a type of alt-az mount that are designed to support heavy telescopes with large apertures. 

Equatorial mounts are used with more sophisticated telescopes. One of their axes aligns with Earth’s rotation axis. These mounts are designed for long-term observation and astrophotography.

Ease of use

When considering what telescope to buy, look for options that will be easy for them to operate. Keep an eye out for models that are easy to set up and come with tripods. Many options are also lightweight and come with a carrying case or backpack for easy portability, such as the Gskyer 70mm Aperture 400mm AZ Mount Astronomical Refractor Telescope.

Age of your child

Kids age 4 to 8 starting stargazing will do well with a tabletop model with simple controls, such as the Celestron FirstScope. Meanwhile, older kids with some experience will appreciate the flexibility of telescopes with smartphone adapters that let them take photos and images of their cosmic finds, or they can use to take photos with their smartphone and the Celestron Astro Fi 102 WiFi Maksutov Wireless Reflecting Telescope, which they can operate remotely using their smartphone or an iPad.

FAQs

Final thoughts on the best telescopes for kids

• Best overall: Celestron Inspire 100AZ
• Best for young kids: Celestron FirstScope 76 Tablestop Telescope 
• Best for older kids: Celestron Astro Fi 102 WiFi Maksutov Wireless Reflecting Telescope
• Best for travel: Gskyer 70mm Aperture 400mm AZ Mount Astronomical Refractor Telescope
• Best for smartphone photography: POPULAR SCIENCE AstroMaster 80mm – Portable Refractor Telescope
• Best budget: MaxUSee Kids Telescope 400x40mm with Tripod & Finder Scope

If you’re looking to give your children an appreciation for the galaxy, these telescopes for kids can help them see the stars and the planets close up. These models are easy to assemble and are designed with features that kids will appreciate, such as the ability to take photos with their phones. You’ll be glad you have one of the best telescopes on hand for the next cosmic event.

Why trust us

Popular Science started writing about technology more than 150 years ago. There was no such thing as “gadget writing” when we published our first issue in 1872, but if there was, our mission to demystify the world of innovation for everyday readers means we would have been all over it. Here in the present, PopSci is fully committed to helping readers navigate the increasingly intimidating array of devices on the market right now.

Our writers and editors have combined decades of experience covering and reviewing consumer electronics. We each have our own obsessive specialties—from high-end audio to video games to cameras and beyond—but when we’re reviewing devices outside of our immediate wheelhouses, we do our best to seek out trustworthy voices and opinions to help guide people to the very best recommendations. We know we don’t know everything, but we’re excited to live through the analysis paralysis that internet shopping can spur so readers don’t have to.

The post The best telescopes for kids in 2023 appeared first on Popular Science.

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Million of years ago, before land connected Earth’s North and South American continents, about 21 million light years away an aged and bloated star gave up the ghost in dramatic fashion, dying in a cataclysmic supernova explosion.

On Friday, May 19, the light from that massive explosion finally reached the telescope of Japanese amateur astronomer Koichi Itagaki, who alerted the larger astronomical community: The supernova is now officially named SN2023ixf. 

”Those photons that left that exploding star 20 million years ago have just now washed upon our shores from this long, long voyage through the cosmos,” says Grant Tremblay, an astrophysicist at the Harvard and Smithsonian Institute Center for Astrophysics, who has been actively spreading the word of the supernova on social media. “It’s happening now, in that we’re watching this thing finally explode, but the star has been dead for 20 million years.”

SN2023ixf is the closest supernova of its kind to Earth to pop off in five years, and the second closest in the past decade, according to NASA. That makes SN2023ixf a rare opportunity for astronomers to study the fiery death of a star. While too faint to be seen by the naked eye, the supernova should be visible to modest hobbyist telescopes, according to Tremblay. 

Because the supernova will fade rapidly, stargazers have to seize the opportunity to observe it, including at multiple wavelengths.“The whole global community has rallied, from community astronomers to big multibillion-dollar space telescopes,” Tremblay says. 

How to spot supernova SN2023ixf 

SN2023ixf exploded in M101, also known as the Pinwheel galaxy, which is located in the night sky near the constellation Ursa Major. M101 is a bright spiral galaxy that lies face-on from the perspective of Earth and is a member of the Messier catalog of celestial objects, making it a common target for backyard astronomers. A 4.5-inch telescope should be sufficient to view the supernova, which will appear as a bright point of light, according to Sky and Telescope. You can find M101 by first finding Mizar, the star at the bend in Ursa Major’s tail, and following the five stars that lead away from it. Or, to be more precise, you want to point your telescope at a right ascension of 14:03:38.580 and a declination of +54:18:42.10. 

[Related: Astronomers just confirmed a new type of supernova]

Alternatively, the Virtual Telescope Project, a worldwide network of quality amateur telescopes, will livestream an observation of the supernova beginning at 6:30 p.m. Eastern on May 26. 

“M101 is imaged by human beings every single night, all around the world, from hobbyists to all sky observatories like [The Sloan Digital Sky Survey], and so it was inevitable that this thing would be found eventually. But I just loved that Itagaki found yet another supernova,” Tremblay says. Itagaki is not a professional scientist, but he is the co-author of more than a dozen scientific papers based on his supernova observations. Tremblay says Itagaki has a “legendary” ability to spot supernovas, and he’s collecting these “discoveries like Thanos and infinity stones.” Itagaki’s findings include the 2018 supernova SN 2018zd, which proved to be an entirely new type of supernova in the universe. 

Catching the bright burst of SN2023ixf on May 19, Itagki submitted his discovery to the International Astronomical Union’s transient name server website. From there, professional astronomers picked up the call, and within a few days, researchers began pointing major ground and space telescopes at the supernova, including the Hubble and James Webb Space Telescopes and the Chandra X-ray observatory.

All those telescopes will be measuring SN2023ixf’s light curve, “meaning the brightening and fading of this target in multiple wavelengths,” Tremblay says, on the spectrum from X-rays to optical light to infrared.

Lessons from an exploded sun

Those observations will help scientists characterize the star that exploded to create SN2023ixf, and more precisely define the type of supernova it is. Astronomers can already tell that SN2023ixf is a Type II, or “core collapse” supernova. This occurs when a massive star exhausts its nuclear fuel. The nuclear fusion reactions in its core can no longer push outward against the force of the star’s own gravity. The star’s core collapses in on itself, and then explodes outward in less than a second. 

“This shock wave propagates outward, and it plows up gas in the ambient surroundings that can light up in all different wavelengths,” Tremblay says. Studying how that afterglow evolves over time will tell scientists about the mass and make up of the late star.

And the makeup of the star is connected to life on Earth—and life anywhere else in the cosmos, if it exists. Stars increase chemical complexity throughout their life cycles: They formed from primordial hydrogen after the Big Bang, fusing it first into helium and then into heavier elements right up to iron. When those stars die in supernovas, the intense heat and pressure form all of the known elements heavier than iron, and seed them throughout the cosmos, providing the raw material for rocky planets and life itself. “The story of life in the universe can be reduced, in many ways, to the story of increasing complexity,” Tremblay says.

The explosion of SN2023ixf is literally shedding light on the process that brought human beings into existence. Though the supernova will rapidly fade, it will remain an object of study for years to come, according to Tremblay. In the meantime, he says, the worldwide excitement around the supernova “is a beautiful illustration of the fact that the global public so effortlessly shares in our wonderment of the cosmos. An exploding star in a distant galaxy just lights up people’s hearts.”

The post An amateur astronomer spotted a new supernova remarkably close to Earth appeared first on Popular Science.

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What is life? It’s a fuzzy concept without a single answer. If you asked a philosopher, they might quote Plato and tell you it’s the ability to support yourself and reproduce, though that would make sterile donkeys non-living objects. Ask a biologist and they’ll likely hit you with a textbook definition of life as organized matter with genes—as diverse as a paramecium and an elephant.  

Oliver Trapp, a professor of chemistry at the Ludwig Maximilian University of Munich in Germany, offers a different description. He says life is a “self-sustainable reaction network,” in which organisms have the processes necessary to survive and adapt. This is in line with the definition NASA uses when looking for extraterrestrial life. Having a clear idea of what makes up life, and the conditions needed to sustain it, helps astronomers get a better picture of what to look for when searching for life on other planets. 

Specifically, they could look for the environments that have collected the essential ingredients. Prerequisites to making life, based on what happened during early Earth, are materials for organic chemical reactions. In a new study published today in Scientific Reports, Trapp and his colleagues simulated how our planet received the supplies for life-producing chemical reactions 4.4 billion years ago. They suggest that no special or lucky conditions were necessary. Instead, life on Earth was created from volcanic particles and iron-rich meteorites. These carried the building blocks essential to living things: amino acids, lipids, nucleosides, and sugars.

[Related: Here’s how life on Earth might have formed out of thin air and water]

“Understanding the origins of biology is one of the greatest unsolved scientific questions. It has important implications for understanding how common life may be beyond Earth and for understanding humanity’s place in the universe,” says Henderson (Jim) Cleaves, a chemistry professor at Tokyo Institute of Technology and president of the International Society for the Study of the Origins of Life, who was not involved in the study.

Previous theories suggested that Earth’s volcanoes were the starting points. Lava shaped the continents, and volcanic gases helped create oceans and atmosphere. Early Earth may have had another important boost, too, in the form of chemical-rich meteors falling from the sky. 

Trapp’s new study suggests it was the iron from fallen asteroids that helped convert atmospheric carbon dioxide into organic molecules such as hydrocarbons, aldehydes, and alcohol. “The meteorites entered the dense atmosphere, heated up and then you have this ablation of nanoparticles,” he explains. The natural minerals found on volcanoes would have helped support these chemical reactions.

To determine the interplay of space rocks and Earthly eruptions, the authors simulated the conditions of our young planet in the lab. They purchased chunks of two iron and stony meteorites and dissolved them in acid to create a solution, and soaked in crushed samples of volcanic ash and minerals assumed to have been present billions of years ago. The result was a model of meteorites crash landing on volcanic islands. The team also simulated atmospheric conditions on early Earth by combining carbon dioxide gas with hydrogen gas or water under a high-pressure and high-heat system. 

[Related: A new finding raises an old question: Where and when did life begin?]

Observing the reactions in this pressurized model, the team noticed an increase in the production of aldehydes, formaldehydes, alcohol, hydrocarbons, and acetaldehyde. These organic compounds would then be used in further chemical reactions to make amino acids, lipids, DNA, and RNA molecules. “Even at lower temperatures, the particles were highly reactive and quite robust,” Trapp says. The authors suggest that as Earth’s atmosphere cooled down and became more reactive, it was probably easier for iron to speed along the conversion of carbon dioxide into oxygen-containing organic compounds. 

“It is very interesting to see a demonstration of how micrometeorites could have contributed to prebiotic organic synthesis during their infall,” notes Cleaves. While he says the work provides ample evidence for this theory of how life first emerged, he warns this simulation is dependent on the composition of the early atmosphere. It’s unclear if those conditions existed exactly how the lab simulated them, he says.

Trapp says the findings are a start to uncover what makes up life. As long as the right materials are present, the conditions to sustain living things may not be unique to Earth. This could help space explorers decide if a planet is worth exploring. For example, inactive volcanoes have already been spotted in other places like Jupiter’s moon Io and Europa—a strong contender for extraterrestrial life since it holds a liquid water ocean underneath its icy surface.  

Alternatively, these simulations could rule out otherwise promising worlds. “If a planet is cooling down too quickly and no longer able to convert carbon dioxide into organic compounds, this process would completely stop and essentially cause life to die.” Even if we do stumble on a planet with the optimal environment for life, whether we actually find aliens is another matter entirely.

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Our solar system has a suite of eight planets—rocky Mars and Earth, the ice giants, and massive gas planets—but other stars often have a much smaller group. Some suns have just one exoplanet orbiting around them. These loner worlds are often one specific type: A huge gas giant that orbits very close to its star, known as a hot Jupiter.

A newly discovered exoplanet, however, has challenged this view, showing that maybe not all hot Jupiters go solo. Last week, astronomers announced that a hot Jupiter orbiting a star 400 light years away has a pal: It shares its solar system with WASP-84c, a rocky planet so large it’s known as a super-Earth. This discovery was made public as a preprint, a research paper that has yet to undergo peer review, and submitted to the journal Monthly Notices of the Royal Astronomical Society for official publication.

Hot Jupiters are a weird kind of planet. We don’t have any in our own solar system. Until the first was spotted, astronomers never expected them to exist. Gas giants like Jupiter usually only form far away from their stars, where things are cool enough for gas to stay safe from blazing solar heat. If a Jupiter-like planet has to be born at a distance, then, how can it get so close to its star? 

Astronomers have three main theories for how this happens. Two are gentle, and one is catastrophic. First, a hot Jupiter could move inward from its birthplace due to little gravitational nudges from the protoplanetary disk, a collection of dust and gas used to form planets in a star’s youth. Second, maybe we’re wrong about the theory that Jupiter-like planets must form far from stars. Instead, these planets are simply born where we see them. Both of these scenarios would allow hot Jupiters to have smaller friend planets hanging out nearby.

[Related: Ridiculously hot gas giant exoplanet is about to be swallowed by its dying sun]

But the third option is the most dynamic. Jupiters could form far out, but then encounter other planets that change the gas giants’ orbits. The gravity of the other planets would force a hot Jupiter into a stretched out, elliptical path, and then the gravity of the star would pull the gas giant in close, resulting in a circular, super-short orbit. In this violent dance, any low mass planets would be destroyed—creating the lonely hot Jupiter.

The best theory for the origin of this particular hot Jupiter, named WASP-84b, is the first—that a disk helped shepherd the planet through the solar system. Previous observations showed that the gas giant’s spin is aligned with the star’s, a sign that the large planet migrated within the protoplanetary disk instead of pinballing around with other planets. The discovery of super-Earth WASP-84c now adds more evidence to the case that this hot Jupiter formed with a nudge, not a planet-destroying bang—and that scenario may be more common than previously thought.

WASP-84c joins a growing list of smaller planetary buddies to hot Jupiters: WASP-47 b, Kepler 730 b, and WASP-132 b, to name a few. “The discovery of low-mass planetary companions like WASP-84c suggests that not all hot Jupiter systems formed under violent scenarios, as previously thought,” says lead author Gracjan Maciejewski from the Institute of Astronomy of the Nicolaus Copernicus University in Torun, Poland.

Maciejewski and his colleagues used NASA’s Transiting Exoplanet Survey Satellite (TESS) to spot WASP-84c. TESS hunts for exoplanets using the transit method, where a telescope watches a star for teensy dips in its brightness, caused by a dark planet passing in front. 

[Related: A deep-space telescope spied an exoplanet so hot it can vaporize iron]

WASP-84c “was too small in radius to have been discovered by the original WASP survey, who discovered the hot Jupiter,” according to Caltech astronomer Juliette Becker, who is not affiliated with the new discovery. “It’s a great example of what TESS can do,” she adds.

With the transit method, astronomers can figure out a planet’s dimensions. However, to find out how much it weighs, they need different data, from another exoplanet-detecting technique known as the radial velocity method. When WASP-84c’s discoverers gathered this extra data, they determined that the planet has about 15 times the mass of Earth. Like our Blue Marble, it’s probably made of iron and rocks, too.

Jonathan Brande, a University of Kansas astronomer not involved in the discovery, thinks such discoveries will become even more common as the James Webb Space Telescope brings in new exoplanet data, deepening our understanding of how these planet pairs came to be. “I would not be surprised if we see further results on this system in the near future,” he says.

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High altitude balloons have drawn a lot of fire lately. In February, the US military shot down a spy balloon potentially operated by the Chinese government and an “unidentified aerial phenomenon” that was later revealed to likely be a hobbyist balloon.

So, when people caught sight of another large balloon in the southern hemisphere in early May, there was concern it could be another spy device. Instead, it represents the future of astronomy: balloon-borne telescopes that peer deep into space without leaving the stratosphere.

“We’re looking up, not down,” says William Jones, a professor of physics at Princeton University and head of NASA’s Super Pressure Balloon Imaging Telescope (SuperBIT) team. Launched from Wānaka, New Zealand, on April 15, the nearly 10-foot-tall telescope has already circled the southern hemisphere four times on a football stadium-sized balloon made from polyethylene film. Its three onboard cameras also took stunning images of the Tarantula Nebula and Antennae galaxies to rival those of the Hubble Space Telescope. The findings from SuperBIT could help scientists unravel one of the greatest mysteries of the universe: the nature of dark matter, a theoretically invisible material only known from its gravitational effects on visible objects.

[Related: $130,000 could buy you a Michelin-star meal with a view of the stars]

Scientists can use next-level observatories like the James Webb Space Telescope to investigate dark matter, relying on their large mirrors and positions outside Earth’s turbulent atmosphere to obtain pristine views of extremely distant celestial objects. But developing a space telescope and launching it on a powerful rocket is expensive. Lofting Hubble into orbit cost around $1.5 billion, for instance, and sending JWST to Lagrange point 2 cost nearly $10 billion.

SuperBIT took just $5 million to launch—a price cut stemming from the relative cheapness of balloons versus rockets and the lower barrier of entry for skilled workers to build the system.

“The whole thing is run by students. That’s what makes projects such as these so nimble and able to do so much with limited resources,” Jones says, referring to the SuperBIT collaborative between Princeton, the University of Durham in the UK, and the University of Toronto in Canada. “We have no professional engineers or technicians working on this full time—only the grad students have the luxury of being able to devote their full-time attention to the project.”

SuperBIT is not the first telescope carried aloft with a balloon: That honor goes to Stratoscope I, which was built in 1957 by another astronomy group at Princeton. But SuperBIT is one of a handful of new observatories made possible by 20 years of NASA research into so-called super pressure balloons. That work finally culminated in tests flights beginning in 2015 and the groundbreaking launch of SuperBIT.

Traditional balloons contain a lifting gas that expands as the sun heats it and as atmospheric pressure changes with altitude. That changes the volume of the envelope and, in turn, the balloon’s buoyancy, making it impossible to maintain a constant altitude over time.

Superpressure balloons keep the lifting gas, typically helium, pressurized inside a main envelope so that volume and buoyancy remain constant across day and night. The balloon then uses a smaller balloon—a ballonet—inside or beneath the main envelope as a ballast, filling or emptying the pocket of compressed air to change altitude and effectively steer the ship.

The super pressure balloon carrying SuperBIT can maintain an altitude of 108,000 feet (higher than 99.2 percent of Earth’s atmosphere) while carrying the 3,500-pound payload of scientific instruments. Unlike JWST and other missions, the purpose of the SuperBIT telescope isn’t to see farther or wider swaths of the universe or to detect exoplanets. Instead, it’s hunting for signs of a more ubiquitous and enigmatic entity.  

“Dark matter is not made of any of the elements or particles that we are familiar with through everyday observations,” Jones says. That said, there’s a lot of it around us: It might make up about 27 percent of the universe. “We know this through the gravitational influence that it has on the usual matter—stars and gas, and the like—that we can see,” which make up around 5 percent of the universe, Jones explains.

Scientists estimate that the remaining 67 percent of the cosmos is made of dark energy, another largely mysterious material not to be confused with dark matter. Whereas the gravity of dark matter may help pull galaxies together and structure the way they populate the cosmos, dark energy may be responsible for the accelerating expansion of the entire universe.

Researchers probe extreme forces where dark matter might exist and calculate its presence by observing galactic clusters so massive their gravity bends the light that passes by them from more distant objects—a technique known as gravitational lensing. Astronomers can use this approach to turn galaxies into a sort of magnifying lens to see more distant objects than they normally could (something JWST excels at). It can also reveal the mass of the galactic clusters that make up the “lens,” including the amount of dark matter around them.

“After measuring how much dark matter there is, and where it is, we’re trying to figure out what dark matter is,” says Richard Massey, a member of the SuperBIT science team and a professor of physics at Durham University. “We do this by looking at the few special places in the universe where lumps of dark matter happen to be smashing into each other.”

Those places include the two large Antennae galaxies, which are in the process of colliding about 60 million light-years from Earth. Massey and others have studied the Antennae galaxies using Hubble, but it “gives it a field of view too small to see the titanic collisions of dark matter,” Massey says. “So, we had to build SuperBIT.”

Like Hubble, SuperBIT sees light in the visible to ultraviolet range, or 300- to 1,000-nanometer wavelengths. But while Hubble’s widest field of view is less than a tenth of degree, SuperBIT’s field of view is wider at half a degree, allowing it to image wider swaths of the sky at once. That’s despite it having a smaller mirror (half a meter in diameter compared to Hubble’s 1.5 meters).

SuperBIT has another advantage over space telescopes. With less time from development to deployment and without complex accessories needed to protect it from radiation, extreme temperatures, and space debris, the SuperBIT team was able to use far more advanced camera sensors than those on existing space telescopes. Where Hubble’s Wide Field Camera 3 contains a pair of 8-megapixel sensors, Jones says, SuperBIT contains a 60-megapixel sensor. The balloon-carried telescope is also designed to float down on a parachute after the end of each flight, which means scientists can update the technology regularly from the ground.

“We’re currently communicating with SuperBIT live, 24 hours a day, for the next 100 days,” Massey says. “It has just finished its fourth trip around the world, experiencing the southern lights, turbulence over the Andes, and the quiet cold above the middle of the Pacific Ocean.” The team expects to retrieve the system sometime in late August, likely in southern Argentina, according to Jones.

[Related on PopSci+: Alien-looking balloons might be the next weapon in the fight against wildfires]

SuperBIT may just be the beginning. NASA has already funded the development of a Gigapixel class Balloon Imaging Telescope (GigaBIT), which will sport a mirror as wide as Hubble’s. Not only is it expected to be cheaper than any space telescope sensing the same spectrum of light, GigaBIT would also be “much more powerful than anything likely to be put into space in the near term,” Jones says.

As to whether SuperBIT will crack the mystery of just what dark matter is, it’s too early to tell. After a few flights, the grad students will have to pore over the project’s findings.

“What will the [data] tell us? Who knows! That’s the excitement of it—and also the guilty secret,” Massey says. “After 2,000 years of science, we still have absolutely no idea what the two most common types of stuff in the universe are, or how they behave.”

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Just in time for the light-filled days before the summer solstice in the Northern Hemisphere, the National Science Foundation’s Daniel K. Inouye Solar Telescope (DKIST) has released some stellar new images of the sun. Observations from the biggest and most powerful solar telescope on Earth show the movement of plasma in the solar atmosphere, intricate details of the sunspot regions, and the sun’s roiling convective cells. One of DKIST’s first-generation instruments, called the Visible-Broadband Imager, obtained these snaps of the sun that were released to the public on May 19.

The sunspots in the images are cool and dark regions on the sun’s “surface,” called the photosphere. Although sunspots are short-lived, strong magnetic fields persist here. The sunspots vary in size, but many are about the size of Earth, if not even bigger. Groups of sunspots can erupt in explosive events such as solar flares or coronal mass ejections (CME), which generate solar storms. Flares and CMEs influence the sun’s outermost atmospheric layer called the heliosphere, and these disturbances have a long reach, even messing with Earth’s infrastructure.

[Related: The sun’s chromosphere is shades of golden in these new images.]

Sunspot activity is also tied to cycles of about 11 years. During a cycle, sunspot and flare activity will rise to a peak solar maximum, when the sun’s poles switch places. Then the activity recedes, falling to almost zero at solar minimum. Our most recent solar cycle, Solar Cycle 25, began in 2019, and is on the upswing: The next solar maximum is expected to take place in 2025.

Astronomers and solar physicists don’t know what creates sunspots or drives these solar cycles, but understanding more can help Earth prepare for CMEs. These ejections can hurl giant clouds of charged particles that slam into our planet’s magnetic field, affecting satellites, radio communications, and even the power grid. 

Not all CMEs wreak havoc, though. Some cause the colorful aurora borealis (or northern lights) in the Northern Hemisphere and aurora australis in the Southern Hemisphere. In April, a CME generated a severe geomagnetic storm. While this geomagnetic storm was not disruptive, the northern lights it made were visible as far south as Arizona. 

[Related: How hundreds of college students are helping solve a centuries-old mystery about the sun.]

The images also show convection cells, which measure up to 994 miles across, in the sun’s quiet regions down to a resolution of about 12 miles. The convection cells give the protosphere, or the visible surface of the sun, a speckled popcorn-like texture, as piping hot plasma rises up from the cells’ center and then travels out to the edges before cooling and falling. 

In the layers of the solar atmosphere, the chromosphere sits above the photosphere. The chromosphere sometimes has dark hair-like threads of plasma called fibrils or spicules. They range from 125 to 280 miles in diameter and erupt up to the chromosphere from the photosphere and last only for a few minutes. 

We can expect to see more stunning images of the cells and other solar features in the coming years, as the solar telescope becomes fully operational. DKIST is named in honor of the late Hawaiian Senator Daniel K. Inouye, is the largest solar telescope in the world at 13 feet-wide. It rests on the peak of the mountain and volcano Haleakalā (or “House of the Sun”) on the island of Maui. It is currently in Operations Commissioning Phase, the observatory’s learning and transitioning period. Scientists will use the solar telescope’s unique ability to capture data in unprecedented detail to better understand the sun’s magnetic field and drivers behind solar storms.

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On Friday, NASA awarded Blue Origin a contract to provide a lunar lander for the Artemis V moon mission scheduled for 2029—two years after they lost a bid to build similar vehicles for the Artemis III and IV missions.

Blue Origin will lead a consortium that also includes Lockheed Martin and Boeing to design and build the lander, with NASA contributing $3.4 billion in funding. According to The New York Times, Blue Origin’s VP for lunar transportation also confirmed their company would also add “well north” of that number for the project.

[Related: SpaceX’s Starship launch caused a ‘mini earthquake’ and left a giant mess.]

“We are in a golden age of human spaceflight, which is made possible by NASA’s commercial and international partnerships,” NASA Administrator Bill Nelson said on Friday. “Together, we are making an investment in the infrastructure that will pave the way to land the first astronauts on Mars.”

Now comes the hard part: Blue Origin will soon begin designing, building, and testing a new lander that meets NASA’s mission requirements, such as the ability to dock with Gateway, a planned space station that will transfer crew into lunar orbit. The contract encompasses both an uncrewed moon landing demo, as well as the crewed Artemis V mission on track for 2029.

In 2021, Blue Origin and another company lost out to SpaceX on a contract to supply vehicles for Artemis III and IV, which both aim to put humans back on the moon’s surface for the first time in over half a century. SpaceX turned in a proposal estimated to cost $2.9 billion, while Blue Origin’s was tallied at $6 billion.

[Related: Watch SpaceX’s giant Starship rocket explode.]

Blue Origin then attempted to sue NASA in federal court over the bidding process, claiming their proposal had been unfairly evaluated. A 76-page report subsequently issued by the Government Accountability Office (GAO) laid out all the reasons NASA had every legal right to choose a contract with SpaceX, which cost around half as much as Blue Origin’s $6 billion proposal. NASA’s other concerns included the fact that Blue Origin’s proposal vehicle did not reportedly include proper safeguards for landing in the dark. As Business Insider noted at the time, “The GAO contended that NASA was not required to lay out all minute details, and Blue Origin should take into account the conditions on the moon or space itself—which is dark.”

Jeff Bezos’ company eventually lost the legal fight. “Not the decision we wanted,” Bezos tweeted afterwards, adding that he would respect the court’s judgment while wishing “full success for NASA and SpaceX on the contract.” Two years later, however, it appears Blue Origin has properly revised its proposal process—hopefully including plans for landing in the dark.

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In its two years and three months of exploring the Red Planet, NASA’s Perseverance Rover has been one busy moving Martian science lab. It has detected signs of past chemical reactions, begun building  a Martian rock depot, and recorded audio of a dust devil for the first time.

[Related: Mars’s barren Jezero crater had a wet and dramatic past.]

Here are a few of the “six-wheeled scientist’s” most recent highlights this month.

New Belva Crater images

Perseverance’s Mastcam-Z instrument collected 152 images while looking deep into Belva Crater. Belva is a large impact crater that lies within the far larger Jezero Crater, which is where Perseverance landed in 2021. The new images are dramatic to look at, but also provide the science team with new insights into Jezero crater’s interior. 

“Mars rover missions usually end up exploring bedrock in small, flat exposures in the immediate workspace of the rover,” deputy project scientist of Perseverance at NASA’s Jet Propulsion Laboratory Katie Stack Morgan said in a statement. “That’s why our science team was so keen to image and study Belva. Impact craters can offer grand views and vertical cuts that provide important clues to the origin of these rocks with a perspective and at a scale that we don’t usually experience.”

According to NASA, it is similar to a geology professor on Earth taking their students to visit highway “roadcuts.” These are places where rock layers and other geological features are visible after construction crews have sliced vertically into the rock. Belva Crater represents a natural Martian roadcut. 

The rover took the images on April 22– the mission’s 772nd Martian day, or “sol”. It was parked just west of Belva Crater’s rim on a light-toned rocky outcrop that Perseverance’s science team calls “Echo Creek.” This 0.6-mile-wide crater was created by a meteorite impact eons ago, and shows multiple locations of exposed bedrock and a region where the sedimentary layers angle downward. 

These steep “dipping beds” potentially indicate the presence of a large Martian sandbar that was deposited by a river channel flowing into the ancient lake that Jezero Crater once held. The science team believes that the large boulders in the crater’s foreground are either chunks of bedrock that the meteorite impact exposed, or the rocks were potentially carried to the crater by a long gone river system.

NASA says the team will continue to search for answers by comparing the features found in the bedrock near the rover with the larger larger-scale rock layers that are visible in the distant crater walls.

Ancient and wild Martian river

Perseverance’s Mastcam-Z instrument also took some new images that possibly show signs of an ancient Martian river. Some evidence shows that this rocky river was possibly very deep and incredibly fast. This now-dry river was part of a network of waterways that flowed into Jezero Crater.

[Related: Name a better duo than NASA’s hard-working Mars rover and helicopter.]

Better understanding of these watery environments could help scientists find signs of ancient microbial life that may have been preserved in the reddish-hued rocks of Mars.

The rover is exploring the top of an 820 feet tall fan-shaped pile of sedimentary rock, with curving layers that suggest water once flowed there. Scientists want to answer whether the water flowed into relatively shallow streams like one that NASA’s Curiosity rover found evidence of in Gale Crater or if Jezero Crater’s was a more powerful river system.

When stitched together, the images come together like a patchwork quilt with evidence of a more raging river because of the coarse sediment grains and cobbles. 

“Those indicate a high-energy river that’s truckin’ and carrying a lot of debris. The more powerful the flow of water, the more easily it’s able to move larger pieces of material,” postdoctoral researcher at NASA’s Jet Propulsion Laboratory Libby Ives, said in a statement.

Ives has a background in studying Earth’s rivers, and spent the last six months analyzing images of Mars’ surface. “It’s been a delight to look at rocks on another planet and see processes that are so familiar,” Ives said.

Both of these discoveries will help Perseverance’s astrobiology mission that includes the search for signs of ancient microbial life. The rover will continue to characterize and study Mars’ geology and past climate, while paving the way for human exploration of the Red Planet, and will also be the first mission to collect and cache Martian rock and regolith.

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Pilots can experience forces while flying that punish their bodies, and they can also find themselves in disorienting situations. A military pilot in a fighter jet will endure G-forces as they maneuver, resulting in a crushing sensation that causes the blood to drain downwards in their bodies, away from the brain. And someone at the controls of a plane or helicopter, even in more routine flights, can have their senses become discombobulated. One of the causes of the crash that killed Kobe Bryant in 2020 was “spatial disorientation” on the pilot’s part, according to the NTSB. 

Then there’s being launched in a rocket up into space. One astronaut recalled to PopSci that when flying in the space shuttle, the engines shut down, as planned, 8.5 minutes after launch. “It felt like the shuttle stopped, and I went straight through it,” he said. “I got a tremendous tumbling sensation.” Another astronaut noted in a recent NASA press release that he felt like he “was on a merry-go-round as my body hunted for what was up, down, left, and right,” in the shuttle as well.

And of course, anyone down on Earth who has ever experienced vertigo, a sensation of spinning, or nausea, knows that those are miserable, even frightening sensations. 

To better understand all the uncanny effects that being up in the air or in space has on humans, NASA is going to employ a Navy machine called the Kraken, which is also fittingly called the Disorientation Research Device—a supersized contraption that cost $19 million and weighs 245,000 pounds. Pity the poor person who climbs into the Kraken, who could experience three Gs of force and be spun around every which way. NASA notes that the machine, which is located in Ohio, “can spin occupants like laundry churning in a washing machine.” It can hold two people within its tumbling chamber. As tortuous as it sounds, the machine provides a way to study spatial disorientation—a phenomenon that can be deadly or challenging in the air or in space—safely down on dry land. 

[Related: I flew in an F-16 with the Air Force and oh boy did it go poorly]

The NASA plan calls for two dozen members of the military to spend an hour in the Kraken, which will be using “a spaceflight setting” for this study. After doing so, half of them, the space agency says, “will perform prescribed head turns and tilts while wearing video goggles that track their head and eye movements.” The other half will not. All of them will carry out certain exercises afterwards, like balancing on foam. Perhaps, NASA thinks, the head movements can help. “Tests with the Kraken will allow us to rigorously determine what head movements, if any, help astronauts to quickly recover their sense of balance,” Michael Schubert, an expert on vestibular disorders at Johns Hopkins University and the lead researcher on this new study, said in the NASA release on the topic.

The study will also involve civilians who have pre-existing balance challenges (due to having had tumors surgically removed), who thankfully won’t have to endure the Kraken. They will also perform the head movements and carry out the same balance exercises. The goal of all this research is to discover if these head movement techniques work, so that “astronauts could adopt specific protocols to help them quickly adapt to gravitational changes during spaceflight,” NASA says. 

Additionally, the same techniques could help regular people who aren’t going to be launched into space but do struggle with balance or dizziness down on Earth. Watch a video about the Kraken, below. 

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Humans might fear the nuclear bomb, but it is not even a blip against what the cosmos can unleash. Take, for example, the gamma ray burst: a stark flash of light and radiation erupting from a colossal star in its death throes. Earlier this year, astronomers spotted a gamma ray burst that they’ve labeled “the brightest of all time.”

Yet a gamma ray burst is only a single exploding star. When far more mass is involved, the universe can set off even larger bangs. In a paper published May 11 in the journal Monthly Notices of the Royal Astronomical Society, astronomers announced what, in their words, is the most energetic astronomical event ever seen.

Still ongoing, this event isn’t as bright as a gamma ray burst—but, lasting far longer, it has unleashed far more energy into the universe. Although this explosion, an event named AT2021lwx, defies easy explanation, the astronomers who found it have an idea involving lucky black holes. If they’re right, their observatories may have sighted something like this event more than once before.

In a bit of irony, this “largest explosion ever seen” evaded astronomers’ detection for nearly a year. The Samuel Oschin Telescope, nestled at Palomar Observatory in the mountains northeast of San Diego, California, first picked up a brightening blip in June 2020. But as often happens in astronomy, a field inundated with data from a sky constantly bursting with activity, the event remained unnoticed.

Only in April 2021 did an automated system called Lasair bring AT2021lwx to human astronomers’ attention. By then, the blip in the sky had been steadily brightening for more than 300 days. While the blip was peculiar, astronomers thought little of it, until they estimated the object’s brightness by calculating how far away the event was: 8 billion light-years.

“That’s, suddenly, when we realized: ‘Hang on, this is something very, very unusual,’” says study author Philip Wiseman, an astronomer at the University of Southampton in the UK.

[Related: Astronomers now know how supermassive black holes blast us with energy]

“I haven’t seen anything changing brightness and becoming this bright on such a short timescale,” says Tonima Ananna, a black hole astrophysicist at Dartmouth College, who wasn’t an author.

At first, the authors didn’t know what to make of AT2021lwx. They asked their colleagues. Some thought it was a tidal disruption event, where a black hole violently tears apart a captured star. But this event was far, far brighter than any known star-eating episode. Others thought it was a quasar, a young galaxy with an active nucleus: a supermassive black hole churning out bright jets of radiation. But this event’s hundredfold surge in brightness was far greater than anything astronomers had seen in quasars.

“You have the tidal disruption people saying, ‘No, I don’t think it’s one of ours.’ You’ve got the quasar people saying, ‘No, I don’t think it’s one of ours.’ That’s where you have to start coming up with a new scenario,” Wiseman says.

Their new scenario also involves a black hole: a supermassive one, more than a million times the mass of the sun, at the heart of a galaxy. Normally, a supermassive black hole is surrounded by a gas accretion disc, drawn in by the immense gravity. Some supermassive black holes, like those in quasars, actively devour that gas; as they do, they glow in response. Others, like the one in the center of the Milky Way, are dormant, quiet, and dark.

Wiseman and his colleagues believe that, abruptly, a dormant black hole might suddenly find itself inundated by a very large quantity of gas—potentially thousands of times the mass of the sun. The black hole would respond to its newfound banquet by brilliantly awakening, bursting far more brightly than even an active counterpart.. 

Wiseman and his colleagues believe that such a windfall triggered AT2021lwx, causing a dormant supermassive black hole to light up the night.

“I think they make a compelling case that this is a supermassive black hole … suddenly being ‘switched on,’” says Ananna.

Astronomers might have seen accretion events like AT2021lwx before. Wiseman and his colleagues pored through past observations and found multiple needles in the haystack of astronomical data that resembled the record event. None of them were even close to this one’s brightness, but they also increased in luminosity along a similar pattern. These events occurred in galaxies known to have black holes at their centers, showering in streams of gas that fall inward.

[Related: Astronomers just caught a ‘micronova’—a small but mighty star explosion]

“There’s a chance that [the record event] is the same, but just the amount of gas that has been dumped on is much, much, much, much larger,” says Wiseman.

Wiseman and his colleagues plan to put their ideas to the test in the form of computer simulations. By doing this, they can learn if accretion events could have caused this record explosion and the other bright patterns they’d found.

Meanwhile, they’re planning to follow the trail they’ve found. AT2021lwx’s brightness has peaked and begun to steadily decline. They’ve begun watching the object’s X-ray emissions and plan to follow up with radio waves. Once the object has faded to black, they plan to zoom in with something like the Hubble Space Telescope, which can see if there’s a galaxy behind the burst—and what it looks like.

The need for more observations underscores that astronomers still have many unanswered questions about some of the universe’s most extreme events.

“There may be things out there already that have been larger and brighter, but because they are so slow, our detection algorithms never actually flagged them as being an explosion themselves—and they kind of just got lost,” Wiseman says.

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A team of more than 1,000 astronomers and college students just took a step closer to solving one of the long-lasting mysteries of astronomy: Why is the sun’s outer layer, known as the corona, so ridiculously hot? The solar surface is 10,000°F, but a thousand miles up, the sun’s corona flares hundreds of times hotter. It’s like walking across the room to escape an overzealous space heater, but you feel warmer far away from the source instead of cooler, totally contrary to expectations.

The research team used hundreds of observations of solar flares—huge ejections of hot plasma from our star’s surface—to determine what’s heating up the sun’s corona, in results published May 9 in The Astrophysical Journal. What’s really striking about this result, though, is how they did it: with the help of hundreds of undergrads taking physics classes at the University of Colorado, totaling a whopping 56,000 hours of work over multiple years.

Lead author James Paul Mason, research scientist and engineer at the Johns Hopkins Applied Physics Laboratory, calls this a “win-win-win scenario.” He adds, “We were able to harness a ton of brainpower and apply it to a real scientific challenge, the students got to learn firsthand what the scientific process looks like.”

[Related: Volunteer astronomers bring wonders of the universe into prisons]

The classroom project began in 2020, when University of Colorado physics professor Heather Lewandowski found herself teaching a class on experimental physics, which suddenly had to pivot online due to the COVID-19 pandemic—quite the challenge, especially for a hands-on science course. Luckily, Mason had an idea for a solar flare project that needed a lot of hands, and Lewandowski, who usually researches a totally different topic in quantum mechanics, saw that as an opportunity for her students. 

“The question of why the sun’s corona is so much hotter than the ‘surface’ of the sun is one of the main outstanding questions in solar physics,” says Lewandowski. There are two leading explanations for this dilemma, known as the coronal heating problem. One theory suggests that waves in the sun’s mega-sized magnetic field push heat into the corona. The other claims that small, unseen solar flares called nanoflares heat it up, like using a thousand matches instead of one big blow torch. 

Nanoflares are too small for our telescopes to spot, but by studying the sizes of other larger flares, scientists can estimate the prevalence of these little radiation bursts. And, although artificial intelligence is improving every day, automated programs can’t yet do the kind of analysis that Mason and Lewandowski needed. Groups of students in Lewandowski’s class each used data on a different solar flare, getting into nitty-gritty detail to measure how much energy each one dumped into the corona. Together, their results suggest nanoflares might not be powerful enough to heat up the corona to the wild temperatures we see.

[Related: Small ‘sparks’ on the sun could be key to forecasting dramatic solar weather]

The scientific result is only half of the news, though. Lewandowski and Mason pioneered a new way to bring real research into the classroom, giving students a way to not only learn about science, but do it themselves. This type of large-scale student research effort is more common in biology and chemistry, but was pretty much unheard of in physics—until now. “The students participated in all aspects of the research from literature review, meetings with the principal investigator, a proposal phase, data analysis, and peer review of their analysis,” says Lewandowski. The involvement of many students, and their work in groups, is also a reminder that “science is inherently a collaborative endeavor,” she adds.

“I hope that we inspire some professors out there to try this with their classes,” says Mason. “I’m excited to see what kinds of results they’re able to achieve.”

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A golden, tissue box-sized satellite has set a new record for the fastest data transfer rate ever achieved by orbital laser light communications—breaking its own previous milestone set less than a year ago. According to a recent announcement from NASA, the agency’s TeraByte InfraRed Delivery (TBIRD) system achieved a 200 gigabit per second (Gbps) space-to-ground optical link speed on April 28 during a six-minute pass high above its corresponding ground station.

Within that time frame, NASA estimates TBIRD can transmit multiple terabytes of test data back to Earth. That’s equivalent to thousands of hours of HD video data. “This capability will change the way we communicate in space,” said Beth Keer, TBIRD’s mission manager at the Goddard Space Flight Center in Maryland.

[Related: NASA’s newest office is all about putting humans on Mars.]

Since 1958, radio waves have transmitted the majority of all space communications via the Deep Space Network, a global antenna array capable of sending and receiving information for satellites and astronaut crews. As NASA explains, switching to “ultra-high-speed” optical communications crams more data into each lasers’ infrared light waves that are invisible to the naked eye. This alternative—as showcased in TBIRD’s recent record breaking demonstrations—will prove vital to future space research and exploration, particularly as humans look to return to the moon, and eventually attempt to make their way to Mars.

The TBIRD system was first delivered into space last year via NASA’s Pathfinder Technology Demonstrator 3 (PTD-3) as a tiny satellite (also known as a CubeSat) roughly the size of two stacked cereal boxes. CubeSats are popular for both their relative simplicity and cost-effectiveness. After launching aboard SpaceX’s Transporter-5 rideshare mission in May 2022, PTD-3 synchronized with the Earth’s solar orbit so that the CubeSat entered a “fixed” position relative to the sun. Once established, the TBIRD satellite could begin transmitting data twice a day as it passed over its space-to-ground command center link. Within less than a year, its capabilities have broken records twice over.

[Related: This tiny, trailblazing satellite is taking on a big moon mission.]

“Just imagine the power of space science instruments when they can be designed to fully take advantage of the advancements in detector speeds and sensitivities, furthering what artificial intelligence can do with huge amounts of data,” Kerr added. “Laser communications is the missing link that will enable the science discoveries of the future.”

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This year marks the 250th anniversary of the first human hopping aboard a hot air balloon. But Jean-Francois Pilatre de Rozier only hovered about 85 feet above the ground, so it’s safe to say he would be stunned at what his country’s modern denizens are planning. As CNN reported on Thursday, a French company called Zephalto aims to begin “edge of space” hot air balloon tourist sojourns as early as next year—for $130,000 a seat.

After ponying up the hefty price tag, passengers will board Zephalto’s pressurized capsule, Celeste, which is attached to a massive, helium-filled stratospheric balloon. Over the course of roughly ninety minutes, the balloon will ascend at 4 meters per second to an altitude of 25 kilometers (about 15.5 miles). Once at the edge of space, tourists will enjoy a fancy meal during their three-hour hover time in front of 7-square-meter window views of the Earth’s curvature before descending back down to terra firma.

[Related: How will NASA keep up with space tourism?]

Other high-profile space tourism ventures such as Blue Origin and Virgin Galactic travel much higher than the capabilities of even a high-end hot air balloon such as Zephalto’s. In July 2021, Virgin Galactic’s founder, Richard Branson, soared 86 km above Earth. Just one week later, Blue Origin took its co-founder and Amazon CEO Jeff Bezos above the Karman Line, the internationally recognized (if somewhat disputed) boundary for outer space.

Unlike those high-profile space tourism ventures, however, Zephalto bills itself as being a much more eco-friendly alternative. According to its official description page, only 26.6 kg of CO2 are purportedly needed for a single journey—the lowest amount required for a space flight, says the company, or akin to “as little as the production of a pair of denim trousers.” By comparison, a single suborbital rocket launch can put out as much as 300 tons of CO2 into the upper atmosphere during its journey.

[Related: Blue Origin brought the first official tourists to space.]

As reservations quickly fill for the trips—Zephalto told CNN it’s already booked out until mid-2025. The company’s founder recently explained they were working closely with France’s space agency, CNES, alongside partners at Airbus to ensure all safety and logistical regulations are met. Once in full swing, Zephalto aims to launch as many as 60 flights per year, each with six passengers alongside two pilots.

And if the six-hour-total journey and fancy meal aren’t enough to sell you on a $130,000 ticket, Zephalto says it’s throwing in complementary psychological counseling ahead of the outing to help deal with what’s known as the “overview effect,” the existential weight that reportedly comes from viewing the entirety of Earth from high above its surface.

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It turns out that Saturn’s signature rings are a relatively new accessory. A study published May 12 in the journal Science Advances found that the planet’s colorful rings are no more than 400 million years old, while Saturn itself is about 4.5 billion years old.

[Related: Hubble telescope spies Saturn’s rings in ‘spoke season.’]

Saturn’s rings have captivated astronomers for over four centuries. In 1610, famed Italian astronomer Galileo Galilei first observed the rings using a telescope, but he did not know what they were. By the 19th century, a Scottish scientist named James Clerk Maxwell concluded that the rings couldn’t be solid, but were actually made up of many individual pieces. 

Throughout the 20th century, it was assumed that the rings came about at the same time as Saturn. This raised some questions, particularly why the rings were sparkling clean. To figure out why, the team on this study looked closely at an object that annoys allergy sufferers and neatniks alike–dust. Tiny grains of rocky material constantly wash through the solar system and this flux of material can leave behind a thin layer of dust on planetary bodies– including Saturn’s icy rings. Like running your finger along the dusty surface of an old house, the team used these dust layers to see how quickly the layer builds on Saturn’s rings.

“Think about the rings like the carpet in your house,” study co-author and physicist at the University of Colorado Boulder Sascha Kempfsaid Kempf said in a statement. “If you have a clean carpet laid out, you just have to wait. Dust will settle on your carpet. The same is true for the rings.”

From 2004 to 2017, the team used an instrument aboard NASA’s late Cassini spacecraft called the Cosmic Dust Analyzer. The bucket-shaped Cosmic Dust Analyzer scooped up small particles as they whizzed by. 

The team collected 163 grains over 13 years that had all originated from beyond Saturn’s close neighborhood. Using the grains, they calculated that Saturn’s rings have likely been gathering dust in space for only a few hundred million years–making them relatively new in space terms. 

[Related: NASA hopes its snake robot can search for alien life on Saturn’s moon Enceladus.]

“We know approximately how old the rings are, but it doesn’t solve any of our other problems,” Kempf said. “We still don’t know how these rings formed in the first place.”

The team estimated that this interplanetary grime would add far less than a single gram of dust to each square foot on Saturn’s rings every year. This is not a lot of dust, but would still add up over millions of years. 

Scientists now know that the seven rings are made of countless ice chunks, most of which are about the size of a boulder. The ice of the rings weighs about half as much as Saturn’s moon Mimas and stretches close to 175,000 miles from the planet’s surface. 

Future studies into the space dust could reveal more about planetary age, thanks to a more sophisticated dust analyzer that will be aboard NASA’s upcoming Europa Clipper mission. This mission is scheduled to launch in October 2024 and will explore Jupiter’s moon Europa and if this icy moon could harbor conditions suitable for life.

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For more than 22 years, astronauts and cosmonauts have continuously inhabited the International Space Station, making the orbital laboratory the longest flying spacecraft ever. But it’s an achievement that would be impossible if not for an earlier space station, NASA’s Skylab, launched 50 years ago on May 14, 1973. 

Born out of the disappointment and leftovers over the canceled Apollo moon missions, Skylab never captured the public imagination the way the space race had during the decade prior. But the mission was crucial to all human spaceflight that came after, teaching NASA valuable lessons about how to build spacecraft safe for long-term habitation, and how to design missions around the humans that would fly them. 

“Every corner of the ISS has a lesson that’s grounded in Skylab,” says NASA’s Chief Historian Brian Odom. “Skylab is the turning point where humanity says, ‘We’re going to become a species that lives off of Earth for long periods of time.” 

Moonshots and space stations

NASA had always wanted a space station. The plan, according to Odom, was to learn to get off Earth with Project Mercury—in which Alan Shepard became the first American to fly in space—then to rendezvous and dock in orbit with Gemini, and “the next stop from that would be to build a space station,” he says. That space station would be the waypoint from which humans could venture farther out to the moon, and later to Mars. 

But everything changed with President John F. Kennedy’s 1961 speech announcing a race against the Soviet Union to land on the moon.

“Some people talk about Apollo as leapfrogging what was expected, as the natural process or the natural progression in spaceflight,” says Teasel Muir-Harmony, a space historian curator of the Apollo collection at the National Air and Space Museum. “Instead of building a space station, we went right to the moon.”

Immense amounts of money and political capital were spent so Americans got to the moon first. But public support—and congressional funding—began to wane almost immediately after the July 20, 1969, Moon landing. Apollo missions 18, 19 and 20 were canceled by 1971, and the crew of Apollo 17 would be the last humans to touch the moon for decades to come. 

The idea for Skylab originated in 1965, when NASA budgets were plump. The agency decided the program could go forward even after money tightened up, in part because the satellite would use existing Apollo infrastructure. A Saturn V rocket, originally intended to launch the Apollo 12 mission, could place Skylab in orbit. And the space station itself would be constructed out of a rocket’s third stage. 

“It was a really ingenious and practical approach to creating a space station,” Muir-Harmony says. 

[Related: A brief history of space stations before the ISS]

The architecture of Skylab wasn’t the only creative use of materials. During the May 14 launch, Skylab’s micrometeorite shield, which also functioned as a sun shade, was shorn off, leaving the newly orbital space station to roast in the direct sunlight. NASA’s “Mr. Fix It,” Jack Kinzler, officially the chief of the Technical Services Center at Johnson Space Center, used telescoping fishing rods to develop a prototype parasol-like sunshield astronauts could deploy through an airlock on Skylab. They did this in just six days, saving the space station. It was one of the first important lessons of Skylab, according to Odom. 

“It’s one of these remarkable moments that teaches us that you can respond in a crisis” Odom says. 

The lessons of Skylab 

Skylab hosted three crews from 1973 through 1974. The Skylab I crew flew for 28 days, while the Skylab II mission lasted 59 days. 

But Skylab 3, the third and final crew to fly aboard the space station, lasted 84 days, launching on November 16, 1973 and returning to Earth on February 8, 1974. 

This was a huge deal at the time. Later NASA astronauts, such as Scott Kelly and Peggy Whitson, would work for hundreds of days aboard the ISS, but in 1973, no one knew if humans could actually live in space for such a period. The Skylab III crew’s stay was longer “than all of earlier spaceflight combined,” Odom says. 

Skylab affirmatively answered the question of whether humans could endure long-term spaceflight, but it also made clear there were costs. 

“They noticed increased calcium in the urine of the astronauts, tied to bone loss,” Muir-Harmony says, which highlighted the importance of movement while in space. Exercise is now considered a key part of an ISS astronaut’s schedule. 

Skylab also identified small quality-of-life changes that could make orbit more comfortable, such as the cuisine. “The food was generally considered a bit too bland,” Muir-Harmony says. “Your ability to taste is limited by how the fluid in your body blocks your nasal cavity [in microgravity], so it’s important to have more flavorful food in space.” 

And Skylab’s supposedly water-tight microgravity shower, a cylindrical tent-like contraption, will likely be the last shower on a space station, according to Muir-Harmony. “It didn’t work all that well,” she says. “That was an important lesson to learn, that it was better to use wet wipes as opposed to trying to shower in space.” 

Another lasting lesson was that all the clever engineering in the world won’t help you if you don’t pay attention to your crew’s human needs. The Skylab III crew nearly burned out, with barely any time between tasks or to rest, forcing NASA to reassess their work schedule. “You can’t task people with just working themselves full on and then falling asleep, sleeping eight hours, waking up, and immediately going back to work,” Odom says. “They learned those lessons the hard way on Skylab by putting people to some degree through the wringer.”

[Related: 11 of NASA’s most out-of-this-world illustrations]

Skylab’s final teaching might be the most important for anyone operating in space today, particularly as the number of satellites and other spacecraft in low Earth orbit increase. Unlike the ISS, Skylab was not equipped with thrusters. It could not manage its own altitude, because it was assumed that the Space Shuttle would be operational by 1977 and could boost the station higher when necessary. But the development program dragged, and the first shuttle didn’t fly until 1981. With Skylab’s orbit degrading, NASA decided to allow the station to reenter Earth’s atmosphere on July 11, 1979, hoping the station would burn up over the Indian Ocean. Pieces of debris ended up scattered over parts of Western Australia, though no one was hurt. 

The NASA of today would consider such a reentry reckless. It’s a problem, Odom says, if you don’t know exactly where your spacecraft is going to come down. “NASA has definitely learned that lesson from 1979, in a big way.”

Skylab’s enduring legacy

Without regular rides to space, Skylab crews had only what they brought with them. Astronauts flying aboard the ISS today face fewer constraints than Skylab crews did. The ISS recycles most of its water, for instance, and regular cargo resupply missions deliver food to the astronauts there. There are now exercise facilities and more thoughtfully planned out work schedules. 

“Skylab was just a massive step forward from what anyone had experienced before,” Odom says. “Somebody’s got to be the pioneer and put the risk on. And Skylab was all about risk.”

The ISS has hosted astronauts for more than 350 days at a time—a remarkable achievement, and one that would not be possible without Skylab’s experience. 

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Best overall		Celestron StarSense Explorer DX 130AZ		SEE IT	A solid build and specs, paired with smartphone-guided sky recognition technology, makes this telescope perfect for starry-eyed explorers.
Best for viewing planets		Sky-Watcher Skymax 102mm Maksutov-Cassegrain Telescope		SEE IT	This telescope punches above its weight class in size and power, making it an ideal scope for checking out neighboring orbs.
Best for kids		Orion Observer II 60mm AZ Refractor Telescope Starter Kit		SEE IT	The entire package is designed to inspire kids during the window where they stare curiously out of the windows.

Telescopes under $500 can provide a passport to the universe without emptying your wallet. In their basic function, telescopes are our connection to the stars. For millennia, humankind has gazed skyward with wonder into the infinite reaches of outer space. And as humans are a curious bunch, our ancestors devised patterns in the movements of celestial bodies and gave them names and built stories around them. The ancient Egyptians, Babylonians, and Greeks indulged in star worship. But you don’t have to follow those lines to geek out over the vastness of the night sky. It’s just so cool. Fortunately, whatever your motivation for getting under the stars, there is an affordable option for you on our list of the best telescopes under $500.

• Best overall: Celestron StarSense Explorer DX 130AZ
• Best for viewing planets: Sky-Watcher Skymax 102mm Maksutov-Cassegrain Telescope
• Best for astrophotography: William Optics Guide Star 61
• Best for kids: Orion Observer II 60mm AZ Refractor Telescope Starter Kit
• Best budget: Popular Science by Celestron Travel Scope 70 Portable Telescope

How we chose the best telescopes under $500

The under-$500 telescope market is crowded with worthy brands and models, so we looked at offerings in that price range from several well-known manufacturers in the space. After narrowing our focus based on personal experience, peer suggestions, critical reviews, and user impressions, we considered aperture, focal length, magnification, build quality, and value to select these five models.

The best telescopes under $500: Reviews & Recommendations

To get the best views of the stars, planets, and other phenomena of outer space, not just any old telescope will get the job done. There are levels of quality and a wide range of price points and features to sort through before you can be sure you’re making the right purchase for what you want out of your telescope, whether it’s multi-thousands or one of the best telescopes for under $1,000, or one of our top picks under $500.

Best overall: Celestron StarSense Explorer DX 130AZ

Celestron

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Why it made the cut: Solid build and specs, paired with the remarkable StarSense Explorer app, make this telescope a perfect introduction to celestial observation.

Specs

• Focal length: 650mm
• Aperture: 130mm, f/5
• Magnification: 65x, 26x

Pros

• App aids in finding stars
• Easy to operate
• Steady altazimuth mount

Cons

• Eyepieces are both low power

Newbies to astronomy today can have a decidedly different experience than beginners who started stargazing before smartphones were a thing. Instead of carting out maps of the night sky to find constellations, the StarSense Explorer series from Celestron, including the DX 130AZ refractor, makes ample use of your device to bring you closer to the stars. 

With your smartphone resting in the telescope’s built-in dock, the StarSense Explorer app will find your location using the device’s GPS and serve up a detailed list of celestial objects viewable in real time. Looking for the Pleiades cluster? This app will tell you how far away it is from you and then lead you there with on-screen navigation. The app also includes descriptions of those objects, tips for observing them, and other useful info. 

The StarSense Explorer ships with an altazimuth mount equipped with slow-moving fine-tuning controls for both axes so you can find your target smoothly. And for those times you want to explore the night sky without tethering a smartphone, the scope’s red dot finder will help you zero in on your targets. The two eyepieces, measuring 25mm and 10mm, are powerful enough to snag stellar views of the planets but not quite enough to see the details a high-powered eyepiece would deliver.

Best for viewing planets: Sky-Watcher Skymax 102mm Maksutov-Cassegrain Telescope

Sky-Watcher

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Why it made the cut: This telescope punches above its weight class in size and power, making it an ideal scope for viewing planets.

Specs

• Focal length: 1300mm
• Aperture: 102mm, f/12.7
• Magnification: 130x, 52x

Pros

• Great for viewing planets and galaxies
• Sharp focus and contrast
• Powerful

Cons

• Not ideal for deep-space viewing

Let’s be real—most consumers in the market for a moderately priced telescope are in it to gain spectacular views of the planets and galaxies, but probably not much else. And it’s easy to see why. Nothing makes celestial bodies come alive like viewing them in real time, in all their colorful glory.

If that sounds like you, allow us to direct you to the Sky-Watcher Skymax 102, a refracting telescope specializing in crisp views of objects like planets and galaxies with ample contrast to make them pop against the dark night sky. The Skymax 102 is based on a Maksutov-Cassegrains design that uses both mirrors and lenses, resulting in a heavy-hitting scope in a very compact and portable unit. A generous 102mm aperture pulls in plenty of light to illuminate the details in objects, and the 1300mm focal length results in intense magnification.

Two included wide-angle eyepieces measuring 25mm and 10mm deliver 130x and 52x magnification, respectively. The package also includes a red-dot finder, V-rail for mounting, 1.25-inch diagonal viewing piece, and a case for transport and storage. Look no further if you’re looking for pure colors across a perfectly flat field in a take-anywhere form factor.

Best for astrophotography: William Optics GuideStar 61 

William Optics

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Why it made the cut: Top-notch specs and an enviable lens setup make this telescope ideal for astrophotography.

Specs

• Focal length: 360mm
• Aperture: f/5.9
• Magnification: 7x (with 2-inch eyepiece)

Pros

• Well-appointed specs
• Sturdy, durable construction
• Carrying case included

Cons

• Flattener is an extra purchase

Sometimes you want to share more than descriptions of what you see in the night sky, and that’s where this guidescope comes in, helping you to focus on the best full-frame image. You can go as deep into the details (not to mention debt) as your line of credit will allow in your quest to capture the most impressive images of space. Luckily, though, this is a worthy option at a reasonable price. 

The Williams Optics Guide Star 61 telescope is a refracting-type scope with a 360mm focal length, f/5.9 aperture, and 61mm diameter well-suited to capturing sharp images of planets, moon, and bright deep-sky objects. The GS61 shares many specs with the now-discontinued Zenith Star 61, including focal length, aperture, and diameter, as well as the FPL53 ED doublet lens for high-contrast images.

The scope’s optical tube is about 13 inches long and weighs just 3 lbs.—great for traveling with the included carrying case—with a draw-tube (push-pull) focuser for coarse focusing and a rotating lens assembly for fine focus. Attaching a DSLR camera to the Guide Star 61 is a fairly easy job, but note that the flattener for making that connection is a separate purchase.

Best for kids: Orion Observer II 60mm AZ Refractor Telescope Starter Kit

Orion

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Why it made the cut: The entire package is designed to get kids exploring space right out of the box.

Specs

• Focal length: 700mm
• Aperture: 60mm, f/11.7
• Magnification: 70x, 28x

Pros

• Capable of detailed views of moon and planets
• Lightweight construction
• Lots of handy accessories

Cons

• Not enough optical power to reach deep space

Parents have a limited window of time to recognize and develop their kids’ interests. That’s what makes the Orion Observer II such a great buy. Seeing the craters on the moon or the rings of Saturn for the first time can affirm your kids’ curiosity about space and expand their concept of the universe—and they can get those goosebumps while learning through this altazimuth refractor telescope.

The Orion Observer II is built to impressive specifications, with a 700mm focal length that provides 71x magnification for viewing the vivid details of planets in our solar system. True glass lenses (not plastic) are a bonus at this price point, and combined with either included Kellner eyepieces (25mm and 10mm), the telescope delivers crisp views of some of space’s most dazzling objects. 

Kids and parents can locate celestial objects with the included red-dot finder. The kit also includes MoonMap 260, a fold-out map that directs viewers to 260 lunar features, such as craters, valleys, ancient lava flows, mountain ranges, and every U.S. and Soviet lunar mission landing site. An included copy of Exploring the Cosmos: An Introduction to the Night Sky gives a solid background before they go stargazing. And with its aluminum tube and tripod, the entire rig is very portable, even for young ones, with a total weight of 4.3 pounds.

Best budget: Popular Science by Celestron Travel Scope 70 Portable Telescope

Celestron

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EDITOR’S NOTE: Popular Science has teamed up with Celestron on a line of products. The decision to include this model in our recommendations was made by our reviewer independently of that relationship, but we do earn a commission on its sales—all of which helps power Popular Science.

Why it made the cut: With its feature set, portability, and nice price point, this scope is ready for some serious stargazing without a serious investment.

Specs

• Focal length: 400mm
• Aperture: 70mm, f/5.7
• Magnification: 168x

Pros

• Bluetooth remote shutter release
• Ships with two eyepieces
• Pack included

Cons

• Lacks optical power for deep space

Getting out of town, whether you’re camping in the wilderness or taking a drive in the countryside, is one of the attractions of stargazing. Out in the great wide open, far away from streetlights, the stars explode even to the naked eye. Add a handy telescope like the Popular Science Celestron Travel Scope 70 Portable Telescope—our pick for the best portable telescope under $500—and you’ll see much farther into space. The fact that it’s as affordable as it is moveable just adds to the value.

The Popular Science Celestron Travel Scope 70 Portable Telescope is a well-equipped refractor telescope built for backpacking and adventuring but without skimping on cool gadgets. Whether you’re gazing at celestial or terrestrial objects, the smartphone adapter will aid you in capturing images with your personal device, with an included Bluetooth remote shutter release.

Designed with portability and weight in mind, the entire package fits into an included pack with a total of 3.3 pounds—that includes the telescope, tripod stand, 20mm and 10mm eyepieces, 3x Barlow lens, and more. Download Celestron’s Starry Night software to help you get the most from your astronomy experience. 

Here are some other options from the Celestron and Popular Science collaboration:

• Popular Science StarSense Explorer DX 100AZ Smartphone App-Enabled Telescope
• Popular Science AstroMaster 80mm – Portable Refractor Telescope
• Popular Science StarSense Explorer DX 5” Smartphone App-Enabled Telescope 
• Popular Science by Celestron Outland X 12x50mm Monocular with Tripod, Smartphone Adapter, and Bluetooth remote

What to consider when buying the best telescopes under $500

Optics

There are three types of optics available on consumer telescopes, and they will help you achieve three different goals. Refractor telescopes use a series of glass lenses to bring celestial bodies like the moon and near planets into focus easily. Reflector telescopes—also known as Newtonian scopes for their inventor, Sir Isaac Newton—swap lenses for mirrors and allow stargazers to see deeper into space. Versatile compound telescopes combine these two methods in a smaller, more portable form factor, with results that land right in the middle of the pack. 

Aperture

Photographers will recognize this: The aperture controls the amount of light entering the telescope, like on a manual camera. Aperture is the diameter of the lens or the primary mirror, so a telescope with a large aperture draws more light than a small aperture, resulting in views into deeper space. F-ratio is the spec to watch here. Low f-ratios, such as f/4 or f/5, are usually best for wide-field observation and photography, while high f-ratios like f/15 can make deep-space nebulae and other bodies easier to see and capture. Midpoint f-ratios can get the job done for both.

Mounts

All the lens and mirror power in the world won’t mean much if you attach your telescope to a subpar mount. In general, the more lightweight and portable the tripod mount, the more movement you’ll likely get while gazing or photographing the stars. Investing in a stable mount will improve the viewing experience. The two common mount types are alt-az (altitude-azimuth) and equatorial. Altazimuth mounts operate in the same way as a camera tripod, allowing you to adjust both axes (left-right, up-down), while equatorial mounts also tilt to make it easier to follow celestial objects.

FAQs

Final thoughts on the best telescopes under $500

• Best overall: Celestron StarSense Explorer DX 130AZ
• Best for viewing planets: Sky-Watcher Skymax 102mm Maksutov-Cassegrain Telescope
• Best for astrophotography: William Optics Guide Star 61
• Best for kids: Orion Observer II 60mm AZ Refractor Telescope Starter Kit
• Best budget: Popular Science by Celestron Travel Scope 70 Portable Telescope

Although this group of sub-$500 scopes is fairly diverse, the Celestron StarSense Explorer DX 130AZ stands out in our best telescopes under $500 as the best place to start your interstellar journey due to its versatility and sky recognition app, which make for a fun evening of guided tours through the star patterns, no experience necessary. 

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Popular Science started writing about technology more than 150 years ago. There was no such thing as “gadget writing” when we published our first issue in 1872, but if there was, our mission to demystify the world of innovation for everyday readers means we would have been all over it. Here in the present, PopSci is fully committed to helping readers navigate the increasingly intimidating array of devices on the market right now.

Our writers and editors have combined decades of experience covering and reviewing consumer electronics. We each have our own obsessive specialties—from high-end audio to video games to cameras and beyond—but when we’re reviewing devices outside of our immediate wheelhouses, we do our best to seek out trustworthy voices and opinions to help guide people to the very best recommendations. We know we don’t know everything, but we’re excited to live through the analysis paralysis that internet shopping can spur so readers don’t have to.

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At least 83 moons orbit Saturn, and experts believe its most reflective one could harbor life underneath its icy surface. To find out, NASA scientists hope to send a massive serpentine robot to scour Enceladus, both atop its frozen ground—and maybe even within a hidden ocean underneath.

As CBS News highlighted on Monday, researchers and engineers are nearing completion of their Exobiology Extant Life Surveyor (EELS) prototype. The 16-foot-long, 200-pound snakelike bot is capable of traversing both ground and watery environments via “first-of-a-kind rotating propulsion units,” according to NASA’s Jet Propulsion Laboratory. These repeating units could act as tracks, gripping mechanisms, and underwater propellers, depending on the surrounding environment’s need. The “head” of EELS also includes 3D mapping technology alongside real-time video recording and transmission capabilities to document its extraplanetary adventure.

[Related: Saturn’s rings have been slowly heating up its atmosphere.]

In theory, EELS would traverse the surface of Enceladus towards one of the moon’s many “plume vents,” which it could then enter to use as a passageway towards its oceanic source. Over 100 of these vents were discovered at Enceladus’ southern pole by the Cassini space probe during its tenure around Saturn. Scientists have since determined the fissures emitted water vapor into space that contained amino acids, which are considered pivotal in the creation of lifeforms.

To assess its maneuverability, NASA researchers have already taken EELS out for test drives in environments such as an ice skating rink in Pasadena, CA, and even an excursion to Athabasca Glacier in Canada’s Jasper National Park. Should all go as planned, the team hopes to present a finalized concept by fall 2024. But be prepared to wait a while to see it in action on Enceladus—EELS’ journey to the mysterious moon would reportedly take roughly 12 years. Even if it never makes it there, however, the robotic prototype could prove extremely useful closer to Earth, and even on it. According to the Jet Propulsion Lab, EELS could show promise exploring the polar caps of Mars, or even ice sheet crevasses here on Earth.

[Related: Saturn has a slushy core and rings that wiggle.]

Enceladus’ fascinating environment was first unveiled thanks to NASA’s historic Cassini space probe. Launched in 1997, the satellite began transmitting data and images of the planet and its moons back to Earth after arriving following a 7 year voyage. After 13 years of service, a decommissioned Cassini descended towards Saturn, where it was vaporized within the upper atmosphere’s high pressure and temperature. Although NASA could have left Cassini to cruise sans trajectory once its fuel ran out, they opted for the controlled demolition due to the slim possibility of crashing into Enceladus or Titan, which might have disrupted the potential life ecosystems scientists hope to one day discover. 

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Our asteroid belt is home to more than a million space rocks, varying in size from a dwarf planet to dust particles, which float between Jupiter and Mars. Astronomers have just discovered another such belt—but this one circles a different star, not our sun.

NASA’s James Webb Space Telescope (JWST) detected this asteroid belt around the star Fomalhaut, only 25 light-years away. For years, scientists have studied Fomalhaut’s debris disk, a collection of rocky, icy, dusty bits from all the collisions that happen while planets are being created. This new data, published today in Nature Astronomy, shows the system in unprecedented detail, uncovering fingerprints of hidden worlds and evidence for planets smashing together.

Many telescopes have pointed to Fomalhaut over the years: the Spitzer Space Telescope, the Atacama Large Millimeter Array (ALMA) in the high desert of Chile, and even the Hubble Space Telescope. Fomalhaut, which is much younger than our sun, may be a good likeness of our solar system near birth; since astronomers can’t time travel back to our sun’s formation, they instead observe other young stars, using these still-forming planetary systems as examples of what the process of making planets can look like.

Fomalhaut is an appealing choice to astronomers because it’s nearby, meaning it’s easier for astronomers to notice fine details. “This system was definitely one of the first we wanted to observe with JWST,” says co-author Marie Ygouf, research scientist at NASA’s Jet Propulsion Lab.

Before JWST, other observations revealed that Fomalhaut is surrounded by a ring of dust analogous to our own solar system’s Kuiper Belt, which contains all the little bits of ice and rock beyond Neptune. The new data from NASA’s superlative space telescope spot not only this outer ring, but also an inner ring more analogous to the asteroid belt. There’s a third feature, too—a giant clump of dust, lovingly referred to as the Great Dust Cloud. 

[Related: These 6 galaxies are so huge, they’ve been nicknamed ‘universe breakers’]

Between Fomalhaut’s outer Kuiper-Belt-like ring and its inner asteroid-belt-like ring is a gap. “The new gap that we see hints at the presence of an ice-giant mass planet, which would be an analog of what we see in the solar system,” like Neptune or Uranus, says lead author András Gáspár, astronomer at the University of Arizona. This unseen planet could be “carving out the gaps” via gravity, explains fellow Arizona astronomer and co-author Schuyler Wolff.

Fomalhaut’s asteroid belt has a curious tilt, appearing at a different angle from the outer ring, as though something knocked it off kilter. A knock, in fact, might explain the misalignment, the researchers say—a major collision could have tilted the asteroid belt, creating the massive dust cloud, too. 

All signs in Fomalhaut “point to a solar system that is alive and active, full of rocky bodies smashing into each other,” says co-author Jonathan Aguilar, staff scientist at Space Telescope Science Institute, home of JWST’s mission control.

JWST was uniquely suited to take these photos of Fomalhaut’s dust. The dust glows brightest in the mid-infrared, at long wavelengths unreachable by most other observatories. A particularly powerful telescope is necessary, too, to resolve enough details—and JWST is the only scope with both these features. The space telescope’s Mid-Infrared Instrument (MIRI) also has a coronagraph, a small dot to block out a bright star and reveal the surrounding dust.

“Mid-infrared wavelengths are so important for debris disk observations because that’s where you observe dust emission, and the distribution of dust tells you a lot about what’s going on,” says Aguilar. The new view of Fomalhaut “showcases the scientific power of JWST and MIRI even just a year into operations,” he adds.

[Related: NASA sampled a ‘fluffy’ asteroid that could hold clues to our existence]

It’s certainly interesting to see what our solar system may have looked like in its infancy—but Fomalhaut isn’t an exact clone. Fomalhaut’s Kuiper Belt and asteroid belt doppelgangers are more spread out and contain more material than those features in our solar system. Although Fomalhaut has more movement and smashing than our solar system does now, our planets had a similar phase in the distant past, known as the Late Heavy Bombardment. Astronomers hope debris disks seen by JWST will help them figure out the details of how solar systems are born, and how they grow up to look like our own set of planets.

“We are at this frontier of unexplored territory, and I’m especially excited to see what JWST finds towards planet-forming disks,” says University of Michigan astronomer Jenny Calahan, who was not involved in the new findings. “Looking at these JWST images I was reminded of the moment that I got glasses for the first time,” adds Calahan. “It just changes your whole perspective when the world (or a debris disk) comes into focus at a level that you aren’t used to.”

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Uranus’ four largest moons could very likely be home to an ocean layer dozens of miles deep between their icy crusts and deep cores. A new analysis from NASA published in the Journal of Geophysical Research, could help determine how a future mission to Uranus might investigate the seventh planet from the sun’s moons, but also has implications that go beyond Uranus.

[Related: Expect NASA to probe Uranus within the next 10 years.]

At least 27 moons circle Uranus. The four largest are about two to three times smaller than  Earth’s moon, with Ariel at about 720 miles across and the largest, Titania, at 980 miles across. Titania’s size has long led scientists to believe that it is the most likely satellite to retain internal heat that is caused by radioactive decay. Uranus’ other moons were believed to be too small to retain the head that is necessary to keep an internal ocean from freezing since the heating created by Uranus’ gravitational pull is only a minor source of heat.  

This new analysis uses data from the Voyager 2 spacecraft and some new computer modeling looked at all of the planet’s five large moons: Ariel, Umbriel, Titania, Oberon, and Miranda. Of these large moons, Titania and Oberon orbit the farthest from Uranus, and these possible oceans could be dwelling 30 miles below the surface. Ariel and Umbriel may have oceans 19 miles deep. 

“When it comes to small bodies – dwarf planets and moons – planetary scientists previously have found evidence of oceans in several unlikely places, including the dwarf planets Ceres and Pluto, and Saturn’s moon Mimas,” co-author and planetary scientist at NASA’s Jet Propulsion Laboratory Julie Castillo-Rogez said in a statement.  “So there are mechanisms at play that we don’t fully understand. This paper investigates what those could be and how they are relevant to the many bodies in the solar system that could be rich in water but have limited internal heat.”

The new study revisited the data from Voyager 2 flybys of Uranus during the 1980s and from more recent ground-based observations. The authors then built computer models using additional findings from NASA’s Galileo, Cassini, Dawn, and New Horizons missions (which all discovered ocean worlds), and insights into the chemistry and the geology of Saturn’s moon Enceladus, Pluto and its moon Charon, and Ceres. These Plutonian and Saturnian moons are all icy bodies about the same size as the Uranian moons.

The team used the modeling to gauge how porous the surface of the Uranian moons are, and found that they are likely insulated enough to retain that internal heat needed to host an ocean. Additionally, the models found a potential heat source in the moons’ rocky mantles. These sources release hot liquid that would help an ocean maintain a warm environment. This warming scenario is especially likely in the moons Titania and Oberon, where the oceans could  even be warm enough to support some sort of lifeforms. 

[Related: Ice giant Uranus shows off its many rings in new JWST image.]

Investigating the composition of these oceans can help scientists learn about the materials that may be found on the icy surfaces of the moons as well, depending on whether or not the substances underneath were pushed up from below by internal geological activity. Evidence from telescopes shows that at least one of the moons (Ariel) has material on it that flowed onto its surface relatively recently, possibly from icy volcanoes. 

Miranda, the innermost and fifth largest Uranian moon, also hosts surface features that may be of recent origin, which suggests it may have held enough heat to maintain an ocean at some points. However, recent thermal modeling found that Miranda likely didn’t host that water for very long, since the moon loses heat too quickly and the ocean is probably frozen now.

Another key finding in the new study suggests that chlorides and ammonia are likely abundant in the oceans. Ammonia can act as an antifreeze, and the author’s modeling suggests that the salts that are likely present in the water would be another source of temperature regulation  that maintains the bodies’ internal oceans.

Digging down into the inner workings of a moon’s surface could help scientists and engineers choose the best instruments to survey them in future missions, but there are still many questions about Uranus’ large moons and work to be done.

“We need to develop new models for different assumptions on the origin of the moons in order to guide planning for future observations,” Castillo-Rogez said.

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NASA officials have talked for years about using the moon as a stepping stone to explore Mars. But now the space agency is finally reorganizing its administration to crystallize that aim in its bureaucratic structure. At the end of March, NASA established the new Moon to Mars Program Office at its Washington, D.C., headquarters. 

This office will unify an array of programs already under way: This includes the goals of NASA’s Artemis Moon mission, such as creating spacesuits for lunar astronauts as well as the Orion spacecraft and Space Launch System (SLS) rocket, which successfully flew the uncrewed Artemis I test flight in November. These projects will be more formally linked to developing technologies and operations for future human journeys to Mars. 

“This new office will help ensure that NASA successfully establishes a long-term lunar presence needed to prepare for humanity’s next giant leap to the Red Planet,” NASA Administrator Bill Nelson said in a statement. 

In the 2022 NASA Authorization Act, Congress mandated that NASA create the Moon to Mars Program Office to ensure that each Artemis lunar mission “demonstrates or advances a technology or operational concept that will enable human missions to Mars.” Following the successful Artemis I test flight, NASA aims to launch four astronauts on a lunar flyby mission for Artemis II in late 2024, and return humans to the moon’s surface in 2025 with Artemis III. Subsequent Artemis missions, at a pace of every other year, should allow astronauts to build a lunar habitat on the moon’s South Pole—with plans to stay for a while. 

[Related: NASA finally got comfier spacesuits, but astronauts still have to poop in them]

“We are going to the moon, we are demonstrating and executing a more sustained presence than we did back on Apollo, historically,” Lakiesha Hawkins, deputy manager of the new office, tells Popular Science. “The demonstrations that we’re doing are setting us up so that we can stay for a long duration; we can, in essence, live off the land.”

NASA astronauts will run experiments to obtain water from ice in lunar craters and to melt lunar regolith, or rocky material, to extract oxygen. They’ll also practice operations and procedures as if they are on Mars, with intentionally prolonged delays in communications to Earth and help all but unavailable. On the moon, these explorers will test the reliability of life support and other systems with an eye toward the Red Planet. “The further we go, the less and less we’ll be able to look back to any capabilities of the home planet in order to help us,” Hawkins says. 

At the moment, the Moon to Mars Program Office is still getting set up and hiring for key roles, according to Hawkins, but some changes have already begun. 

[Related: Meet the first 4 astronauts of the ‘Artemis Generation’]

“One of the things that I think is an obvious change is, we used to have three different divisions,” she says, one division for SLS, Orion, and ground systems; another for a planned lunar space station called Gateway, a lunar lander spacecraft, spacesuits, and lunar surface technologies; and then a third division focused on Mars technologies and capabilities. Those are now merged under the Moon to Mars Program Office. Aligning these offices is “going to help set us up for future success,” Hawkins says.

And while the changes so far are largely administrative, Hawkins sees the Congressional mandate as vindication of NASA’s approach to our nearest extraterrestrial neighbors. “We seem to have a clear strategy that has survived and works. It worked its way through now multiple presidential administrations,” she says. “We are no kidding, returning to the moon.” And after that, eventually, on to Mars. 

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The peak of the Eta Aquarids shower, a flurry of up to 30 meteors an hour, will happen soon: The best time to catch this year’s display is between May 5 and May 6. It’s the result of Earth barging through a cloud of space debris—imagine driving on the highway behind a sloppy gravel truck—but the stuff that’s disintegrating above our heads is actually dust and flakes left behind by Halley’s Comet, aka 1/P Halley.

Halley’s Comet is named after English astronomer Edmond Halley, who in 1705 used Isaac Newton’s theories of physics to calculate the its orbit. The ball of dirty ice cruises around the sun, orbiting opposite Earth’s motion to pass beyond Neptune’s path, and swings back into Earthlings’ view every 75 or so years.

[Related: The biggest comet ever found is cruising through our solar system’s far reaches]

This happens with such regularity that Mark Twain, born in 1835, wrote that he “came in with Halley’s Comet“; the author expected “to go out with it” when it returned in 1910. (Sure enough, Twain died in April of that year.) The last time humans could spy the object in the sky, unaided, was in 1986. Those of us around in mid-2061 will have the chance to see it again.

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This article was original featured on MIT Press.This article is excerpted from Dario Floreano and Nicola Nosengo’s book “Tales From a Robotic World.”

In the early 2010s, a new trend in robotics began to emerge. Engineers started creating robotic versions of salamanders, dragonflies, octopuses, geckos, and clams — an ecosystem of biomimicry so diverse the Economist portrayed it as “Zoobotics.” And yet Italian biologist-turned-engineer Barbara Mazzolai raised eyebrows when she proposed looking beyond animals and building a robot inspired by a totally different biological kingdom: plants. As fluid as the definition of the word robot can be, most people would agree that a robot is a machine that moves. But movement is not what plants are famous for, and so a robotic plant might at first sound, well, boring.

But plants, it turns out, are not static and boring at all; you just have to look for action in the right place and at the right timescale. When looking at the lush vegetation of a tropical forest or marveling at the colors of an English garden, it’s easy to forget that you are actually looking at only half of the plants in front of you. The best-looking parts, maybe, but not necessarily the smartest ones. What we normally see are the reproductive and digestive systems of a plant: the flowers and fruits that spread pollen and seeds and the leaves that extract energy from sunlight. But the nervous system, so to speak, that explores the environment and makes decisions is in fact underground, in the roots.

Roots may be ugly and condemned to live in darkness, but they firmly anchor the plant and constantly collect information from the soil to decide in which direction to grow to find nutrients, avoid salty soil, and prevent interference with the roots of other plants. They may not be the fastest diggers, but they’re the most efficient ones, and they can pierce the ground using only a fraction of the energy that worms, moles, or manufactured drills require. Plant roots are, in other words, a fantastic system for underground exploration — which is what inspired Mazzolai to create a robotic version of them.

“It forced us to rethink everything, from materials to sensing and control of robots.”

Mazzolai’s intellectual path is a case study in interdisciplinarity. Born and raised in Tuscany, in the Pisa area that is one of Italy’s robotic hot spots, she was fascinated early on by the study of all things living, graduating in biology from the University of Pisa and focusing on marine biology. She then became interested in monitoring the health of ecosystems, an interest that led her to get her doctorate in microengineering and eventually to be offered by Paolo Dario, a biorobotics pioneer at Pisa’s Scuola Superiore Sant’Anna, the possibility of opening a new research line on robotic technologies for environmental sensing.

It was there, in Paolo Dario’s group, that the first seeds of her plant-inspired robots were planted. Mazzolai got in touch with a group at the European Space Agency (ESA) in charge of exploring innovative technologies that looked interesting but were still far away from applications, she recalls. While brainstorming with them, she realized space engineers were struggling with a problem that plants brilliantly solved several hundred million years ago.

“In real plants, roots have two functions,” says Mazzolai. “They explore the soil in search of water and nutrients, but even more important, they anchor the plant, which would otherwise collapse and die.” Anchoring happens to be an unsolved problem when designing systems that have to sample and study distant planets or asteroids. In most cases, from the moon to Mars and distant comets and asteroids, the force of gravity is weak. Unlike on Earth, the weight of the spacecraft or rover is not always enough to keep it firmly on the ground, and the only available option is to endow the spacecraft with harpoons, extruding nails, and drills. But these systems become unreliable over time if the soil creeps, provided they work in the first place. They didn’t work for Philae, for example, the robotic lander that arrived at the 67P/Churyumov–Gerasimenko comet in 2014 after a 10-year trip only to fail to anchor at the end of its descent, bouncing away from the ground and collecting just a portion of the planned measurements.

In a brief feasibility study carried out between 2007 and 2008 for ESA, Mazzolai and her team let their imagination run free and described an anchoring system for spacecrafts inspired by plant roots. The research group also included Stefano Mancuso, a Florence-based botanist who would later gain fame for his idea that plants display “intelligent” behavior, although of a completely different sort from that of animals. Mazzolai and her team described an ideal system that would reproduce, and transfer to other planets, the ability of Earth plants to dig through the soil and anchor to it.

In the ESA study, Mazzolai imagined a spacecraft descending on a planet with a really hard landing: The impact would dig a small hole in the planetary surface, inserting a “seed” just deep enough in the soil, not too different from what happens to real seeds. From there, a robotic root would start to grow by pumping water into a series of modular small chambers that would expand and apply pressure on the soil. Even in the best-case scenario, such a system could only dig through loose and fine dust or soil. The root would have to be able to sense the underground environment and turn away from hard bedrock. Mazzolai suggested Mars as the most suitable place in the solar system to experiment with such a system — better than the moon or asteroids because of the Red Planet’s low gravity and atmospheric pressure at surface level (respectively, 1/3 and 1/10 of those found on Earth). Together with a mostly sandy soil, these conditions would make digging easier because the forces that keep soil particles together and compact them are weaker than on Earth.

At the time, ESA did not push forward with the idea of a plant-like planetary explorer. “It was too futuristic,” Mazzolai admits. “It required technology that was not yet there, and in fact still isn’t.” But she thought that others beyond the space sector would find the idea intriguing. After transitioning to the Italian Institute of Technology, in 2012, Mazzolai convinced the European Commission to fund a three-year study that would result in a plant-inspired robot, code-named Plantoid. “It was uncharted territory,” says Mazzolai. “It meant creating a robot without a predefined shape that could grow and move through soil — a robot made of independent units that would self-organize and make decisions collectively. It forced us to rethink everything, from materials to sensing and control of robots.”

The project had two big challenges: on the hardware side, how to create a growing robot, and on the software side, how to enable roots to collect and share information and use it to make collective decisions. Mazzolai and her team tackled hardware first and designed the robot’s roots as flexible, articulated, cylindrical structures with an actuation mechanism that can move their tip in different directions. Instead of the elongation mechanism devised for that initial ESA study, Mazzolai ended up designing an actual growth mechanism, essentially a miniature 3D printer that can continuously add material behind the root’s tip, thus pushing it into the soil.

It works like this. A plastic wire is wrapped around a reel stored in the robot’s central stem and is pulled toward the tip by an electric motor. Inside the tip, another motor forces the wire into a hole heated by a resistor, then pushes it out, heated and sticky, behind the tip, “the only part of the root that always remains itself,” Mazzolai explains. The tip, mounted on a ball bearing, rotates and tilts independent of the rest of the structure, and the filament is forced by metallic plates to coil around it, like the winding of a guitar string. At any given time, the new plastic layer pushes the older layer away from the tip and sticks to it. As it cools down, the plastic becomes solid and creates a rigid tubular structure that stays in place even when further depositions push it above the metallic plates. Imagine winding a rope around a stick and the rope becomes rigid a few seconds after you’ve wound it. You could then push the stick a bit further, wind more rope around it, and build a longer and longer tube with the same short stick as a temporary support. The tip is the only moving part of the robot; the rest of the root only extends downward, gently but relentlessly pushing the tip against the soil.

The upper trunk and branches of the plantoid robot are populated by soft, folding leaves that gently move toward light and humidity. Plantoid leaves cannot yet transform light into energy, but Michael Graetzel, a chemistry professor at EPFL in Lausanne, Switzerland, and one of the world’s most cited scientists, has developed transparent and foldable films filled with synthetic chlorophyll capable of converting and storing electricity from light that one day could be formed into artificial leaves powering plantoid robots. “The fact that the root only applies pressure to the soil from the tip is what makes it fundamentally different from traditional drills, which are very destructive. Roots, on the contrary, look for existing soil fractures to grow into, and only if they find none, they apply just enough pressure to create a fracture themselves,” Mazzolai explains.

This new project may one day result in robot explorators that can work in dark environments with a lot of empty space, such as caves or wells.

The plantoid project has attracted a lot of attention in the robotics community because of the intriguing challenges that it combines — growth, shape shifting, collective intelligence — and because of possible new applications. Environmental monitoring is the most obvious one: The robotic roots could measure changing concentrations of chemicals in the soil, especially toxic ones, or they could prospect for water in arid soils, as well as for oil and gas — even though, by the time this technology is mature, we’d better have lost our dependence on them as energy sources on planet Earth. They could also inspire new medical devices, such as safer endoscopes that move in the body without damaging tissue. But space applications remain on Mazzolai’s radar.

Meanwhile, Mazzolai has started another plant-inspired project, called Growbot. This time the focus is on what happens over the ground, and the inspiration comes from climbing trees. “The invasiveness of climbing plants shows how successful they are from an evolutionary point of view,” she notes. “Instead of building a solid trunk, they use the extra energy for growing and moving faster than other plants. They are very efficient at using clues from the environment to find a place to anchor. They use light, chemical signals, tactile perception. They can sense if their anchoring in the soil is strong enough to support the part of the plant that is above the ground.” Here the idea is to build another growing robot, similar to the plantoid roots, that can overcome void spaces and attach to existing structures. “Whereas plantoids must face friction, grow-bots work against gravity,” she notes. This new project may one day result in robot explorators that can work in dark environments with a lot of empty space, such as caves or wells.

But for all her robots, Mazzolai is still keeping an eye on the visionary idea that started it all: planting and letting them grow on other planets. “It was too early when we first proposed it; we barely knew how to study the problem. Now I hope to start working with space agencies again.” Plant-inspired robots, she says, could not only sample the soil but also release chemicals to make it more fertile — whether on Earth or a terraformed Mars. And in addition to anchoring, she envisions a future where roboplants could be used to grow entire infrastructure from scratch. “As they grow, the roots of plantoids and the branches of a growbot would build a hollow structure that can be filled with cables or liquids,” she explains. This ability to autonomously grow the infrastructure for a functioning site would make a difference when colonizing hostile environments such as Mars, where a forest of plant-inspired robots could analyze the soil and search for water and other chemicals, creating a stable structure complete with water pipes, electrical wiring, and communication cables: the kind of structure astronauts would like to find after a year-long trip to Mars.

Dario Floreano is Director of the Laboratory of Intelligent Systems at the Swiss Federal Institute of Technology Lausanne (EPFL). He is the co-author, with Nicola Nosengo, of “Tales From a Robotic World: How Intelligent Machines Will Shape Our Future,” from which this article is excerpted.

Nicola Nosengo is a science writer and science communicator at EPFL. His work has appeared in Nature, the Economist, Wired, and other publications. He is the Chief Editor of Nature Italy

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Our Earth has siblings—the seven other planets in our solar system—but it doesn’t have a twin with which to share its ring of space. Earth sails through its orbit all alone. Other solar systems, though, might have zanier families that chase each other around a sun: twins, triplets, or even quattuorvigintuplets (that’s 24 Earth-sized planets in a single orbit!). 

Computer simulations by an international team of astronomers illustrated how two dozen planets can share the same orbit, in research published this spring in the Monthly Notices of the Royal Astronomical Society. These wacky configurations can be stable for billions of years, even outliving the stars they’re around. It’s pretty unlikely that nature would create packed planetary orbits, though, which is why researchers suggest a detection of such a system could be a sign of intelligent alien life—possibly even an interstellar message that could exist for eons.

“Our paper explores one additional branch of possible planetary systems that could potentially exist,” says lead author Sean Raymond, CNRS Researcher at the Laboratoire d’Astrophysique de Bordeaux. “I love that it’s so unexpected and weird, and that so many planets can end up sharing the same orbit.”

Multiple planet systems, like our solar system, are often referred to as peas in a pod. But these co-orbiting planets could be “pearls on a necklace,” says University of Kansas astronomer Jonathan Brande, who was not affiliated with the new research.

Nobody had proposed observing two planets in the same orbit, though, until an article posted to the preprint server arXiv last week—but most exoplanet astronomers are skeptical, especially since the signal wasn’t seen in data from other major exoplanet-hunting telescopes like TESS. This paper was written by a group of amateur astronomers who captured observations with small, commercially-available telescopes. “I don’t think it’s the sort of thing you’d be able to pull off in your backyard,” says Brande, regarding the supposed detection. 

[Related: These 6 exoplanets somehow orbit their star in perfect rhythm]

There are a few known examples of co-orbits that involve smaller objects. Our solar system actually has a few such strange orbits, known as horseshoe or tadpole orbits, depending on their shapes. Jupiter’s Trojan asteroids—soon to be visited for the first time by the spacecraft Lucy—share the gas giant’s orbital path as tadpoles, oscillating around points before and after Jupiter in its track around the sun. Two of Saturn’s moons, Janus and Epimethus, orbit the ringed planet together in a horseshoe, periodically swapping places. 

Since objects in our solar system share orbits, it seems reasonable that there might be exoplanets out there that share paths as well. “There are plenty of exoplanet systems in which the planets seem to fill every available niche of stable real estate,” says Raymond. This new research pushes this concept to the extreme, seeing how many planets can cram into the same orbit and remain stable. 

The research team’s simulations also reveal that such co-orbiting planets would have distinct signals for astronomers here on Earth to observe. The Kepler Space Telescope and other space observatories can reveal so-called transit timing variations (TTVs), where the gravitational tug between nearby planets ever-so-slightly changes when a planet passes in front of its star. The TTVs from a system of 24 planets with the mass of Earth sharing an orbit would be large enough for astronomers to see, but it would take months to years of regular monitoring to notice the effect, according to NASA Jet Propulsion Lab astronomer Rob Zellem.

Although academics haven’t been persuaded by the latest observation of supposed co-orbiting planets, there is certainly an important role for amateur astronomers in exoplanet science, Zellem adds.“Given the capability of the observers..we could definitely use their expertise,” he says, especially through citizen science projects such as NASA’s Exoplanet Watch. 

[Related: This alien world could help us find Planet Nine in our own solar system]

A robust detection of co-orbiting planets could be truly exciting, though—not only an observation of nature’s extreme diversity, but possibly even a sign of alien life. “Something like an engineered co-orbiting planetary might not be unambiguously artificial, but would be weird enough to prompt intensive further study,” says Brande.

The study authors think these odd orbits would actually be a perfect technosignature, or sign of intelligent life beyond Earth. Co-author David Kipping, an astronomer at Columbia University, explains that once an advanced civilization constructs an unnatural ring of co-orbiting planets, it wouldn’t require any power to maintain and would be visible for billions of years—a perfect combo for an interstellar message. “The likelihood of this happening really comes down to whether anyone is out there with the capability and will to do this,” he says. “We have no idea. But if we don’t look, we’ll never know.”

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Moriel Schottlender is a software engineer at Wikimedia Foundation. This article was originally posted on her Smarter Than That blog in 2008 and has been lightly edited for Popular Science.

Humanity has known the world is not flat for a few millennia, and I’ve been meaning to show more methods on how to prove the Earth is round. I’ve had a few ideas on how to do that, but got an interesting incentive when Phil Plait, The Bad Astronomer, wrote about the the Flat Earth Society. He claims it’s ridiculous to even bother rebutting the Flat Earth Society—and I tend to agree. But the history of our species’ intellectual pursuit is important and interesting. You don’t need to denounce all science and knowledge and believe in a conspiracy theory to enjoy some historical factoids about humanity’s quest for space.

On we go, to the top 10 ways to unequivocally, absolutely, positively prove the Earth isn’t flat.

1. Check the shadows on the moon

Now that humanity knows quite positively that the moon is not a piece of cheese or a playful god, the phenomena that accompany it (from its monthly cycles to lunar eclipses) are well-explained. It was quite a mystery to the ancient Greeks, though, and in their quest for knowledge, they came up with a few insightful observations that helped humanity figure out the shape of our planet.

Aristotle (who made quite a lot of observations about the spherical nature of the Earth) noticed that during lunar eclipses (when the Earth’s orbit places it directly between the sun and the moon, creating a shadow in the process), the silhouette on the satellite’s surface is round. This shadow is the planet’s, and it’s a great piece of round-Earth evidence.

Since the earth is rotating (see the “Foucault Pendulum” experiment for a definite proof, if you are doubtful), the consistent oval-shadow it produces in each and every lunar eclipse proves that the earth is not only round but spherical—absolutely, utterly, beyond a shadow of a doubt not flat.

2. Follow ships on the horizon

If you’ve been next to a port lately, or just strolled down a beach and stared off vacantly into the horizon, you might have noticed a very interesting phenomenon: Approaching ships do not just “appear” out of the horizon like they should have if the world was flat, but rather seem to emerge from beneath the sea.

But, you say, ships do not submerge and rise up again as they approach our view (except in Pirates of the Caribbean, but we are hereby assuming that was a fictitious movie series). The reason ships appear as if they “emerge from the waves” is because the world is not flat: It’s round.

[Related: How old is Earth? It’s a surprisingly tough question to answer.]

Imagine an ant walking along the surface of an orange, into your field of view. If you look at the orange “head on”, you will see the ant’s body slowly rising up from the “horizon” because of the curvature of the orange. If you would do that experiment with the ant approaching along a long road rather than a round object, the effect would change: The ant would slowly “materialize” into view (depending on how sharp your vision is).

3. Look up at the stars

This observation was originally made by Aristotle (384-322 BCE), who declared the Earth was round judging from the different constellations one sees while moving away from the equator.

After returning from a trip to Egypt, Aristotle noted, “There are stars seen in Egypt and … Cyprus which are not seen in the northerly regions.” This phenomenon can only be explained if humans were viewing the stars from a round surface, Aristotle continued, claiming that the sphere of the Earth is “of no great size, for otherwise the effect of so slight a change of place would not be quickly apparent.”

The farther you go from the equator, the farther the “known” constellations go towards the horizon, to be replaced by different stars. This would not have happened if the world was flat:

4. Conduct a stick test

If you stick a stick in the (sticky) ground, it will produce a shadow. The shadow moves as time passes (which is the principle for ancient Shadow Clocks). If the world had been flat, then two sticks in different locations would produce the same shadow.

But they don’t. This, again, is because the Earth is round, and not flat.

Eratosthenes (276-194 BCE) used this principle to calculate the circumference of the Earth quite accurately. To see this demonstrated, refer to my experiment video about Eratosthenes and the circumference of the Earth.

5. Climb a hill or mountain

Standing on a flat plateau, you look ahead toward the horizon. You strain your eyes, then take out your favorite binoculars and stare through them, as far as your eyes (with the help of the binocular lenses) can see.

Next, climb up the closest tree—the higher the better, just be careful not to drop those binoculars and break their lenses. Then look again, strain your eyes, and stare through the binoculars out to the horizon.

[Related on PopSci+: How to not fear heights]

The higher up you climb, the farther you will see. Usually, we tend to relate this to Earthly obstacles—like the fact we have houses or other trees obstructing our vision on the ground, and climbing upwards we have a clear view—but that’s not the true reason. Even if you stood on a completely clear plateau with no obstacles between you and the horizon, you would see much farther from the greater height than you would on the ground.

This phenomenon is caused by the curvature of the Earth as well, and would not happen if the Earth was flat:

6. Ride a plane

If you’ve ever taken a trip out of the country, specifically long-distance trips, you could notice two interesting facts about planes and the Earth:

• Planes can travel in a relatively straight line for a very long time and not fall off any edges. They can also circle the Earth without stopping.
• If you look out the window on a trans-Atlantic flight, you can, most of the times, see the curvature of the Earth on the horizon. The best view of the curvature used to be on the Concorde, but that plane’s long gone. I can’t wait to see the pictures from the new plane by Virgin Galactic—the horizon should look absolutely curved, as it actually is from a distance.

7. Scope out other planets

The Earth is different from other planets, that much is true. After all, we have life, and we haven’t found any other planets with life (yet). However, there are certain characteristics all planets have, and it will be quite logical to assume that if all planets behave a certain way, or show certain characteristics—specifically if those planets are in different places or were created under different circumstances—our planet is the same.

In other words: If so many planets that were created in different locations and under different circumstances show the same property, it’s likely that our own planet has the same property as well. All of our observations show that other planets are spherical (and since we know how they’re created, it’s also obvious why they take this shape). Unless we have a very good reason to think otherwise (which we don’t), our planet is very likely the same.

In 1610, Galileo Galilei observed the moons of Jupiter rotating around it. He described them as small planets orbiting a larger planet—a description (and observation) that was very difficult for the church to accept, as it challenged a geocentric model where everything was supposed to revolve around the Earth. This observation also showed that the planets (Jupiter, Neptune, and later Venus was observed too) are all spherical, and all orbit the sun.

[Related: Why is space cold if the sun is hot?]

A flat planet (ours or any other planet) would be such an incredible observation that it would pretty much go against everything we know about how planets form and behave. It would not only change everything we know about planet formation, but also about star formation (our sun would have to behave quite differently to accommodate the flat-earth theory) and what we know of speeds and movements in space (like planets’ orbits and the effects of gravity). In short, we don’t just suspect that our planet is spherical. We know it.

8. Consider the existence of time zones

The time in New York, at the moment these words are written, is 12:00 p.m. The sun is in the middle of the sky (though it’s hard to see with the current cloud coverage). In Beijing, it’s 12:00 a.m., midnight, and the sun is nowhere to be found. In Adelaide, Australia, it is 1:30 a.m. More than 13 hours ahead. There, the sunset is long gone—so much so, that the sun will soon rise up again at the beginning of a new day.

This can only be explained if the world is round, and rotating around its own axis. At a certain point when the sun is shining on one part of the Earth, the opposite side is dark, and vice versa. That allows for time differences and time zones, specifically ones that are larger than 12 hours.

Another point concerning time zones, the sun, and Earth: If the sun was a “spotlight” (very directionally located so that light only shines on a specific location) and the world was flat, we would see the sun even if it didn’t shine on top of us (as you can see in the drawing below). Similarly, you can see the light coming out of a spotlight on a stage in the theater, even though you—the crowd—are sitting in the dark. The only way to create two distinctly separate time zones, where there is complete darkness in one while there’s light in the other, is if the world is spherical.

9. Feel the pull of gravity

Here’s an interesting fact about mass: It attracts things to it. The force of attraction (gravity) between two objects depends on their mass and the distance between them. Simply said, gravity will pull toward the center of mass of the objects. To find the center of mass, you have to examine the object.

Consider a sphere. Since a sphere has a consistent shape, no matter where on it you stand, you have exactly the same amount of sphere under you. (Imagine an ant walking around on a crystal ball. From the insect’s point of view, the only indication of movement would be the fact the ant is moving its feet—the shape of the surface would not change at all.) A sphere’s center of mass is in the center of the sphere, which means gravity will pull anything on the surface of the sphere straight down toward the center of the sphere. This will occur no matter where on the surface the object is located.

Consider a flat plane. The center of mass of a flat plane is in its center, so the force of gravity will pull anything on the surface toward the middle of the plane. That means that if you stand on the edge of the plane, gravity will be pulling you sideways toward the plane’s middle, not straight down like you usually experience when you stand on Earth.

I am quite positive that, even for Australians, an apple falls downwards, not sideways. But if you have your doubts, I urge you to try dropping something—just make sure it’s nothing that can break or hurt you.

[Related: Have we been measuring gravity wrong this whole time?]

Here is some further reading about the center of mass and distribution of mass. And if you are brave enough to handle some equations (not involving integration), you can learn more about Newton’s Law of Universal Gravitation.

10. Browse images from space

In the past 60 years of space exploration, we’ve launched satellites, probes, and people into space. Some of them got back, some of them still float through the solar system (and almost beyond it), and many transmit amazing images to our receivers on Earth. In all of these photos, the Earth is (wait for it) spherical. The curvature of the Earth is also visible in the many photos snapped by astronauts aboard the International Space Station. You can see recent examples on the ISS Instagram account.

You know what they say—a picture is worth a thousand diss tracks.

This post has been updated. It was originally published on January 26, 2016.

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[Related: We finally have a detailed map of water on the moon.]

May 4 and 5- Full Flower Moon

The Full Flower moon reaches peak illumination at 1:36 p.m. EDT on Friday, May 5. The moon will be  below the horizon and in daylight at this time, so the best bet is to take a look on the nights of May 4 and 5. The name Flower Moon is in reference to May’s blooms when flowers are typically most abundant in the Northern Hemisphere. 

May’s full moon is also called the Budding Moon or Zaagibagaa-giizis in Anishinaabemowin/Ojibwe, the Summer Moon or Upinagaaq in Inupiat, and the Dancing Moon or Tahch’ahipu in Tunica, the language of the Tunica-Biloxi Tribe of Louisiana.

May 5 and 6- Penumbral Lunar Eclipse

Following April’s total solar eclipse, May will see a penumbral lunar eclipse. Here, the moon will pass deep into the counterpart of planet Earth’s shadow, known as a penumbra. It will be the deepest penumbral eclipse until September 2042. This kind of eclipse is very subtle and those in the regions that can see it will most likely notice that the moon appears a little bit darker, as long as the night skies are clear. 

People living in Asia, Australia, Europe, and Africa will have the best chance of seeing this event.  

[Related: Hubble just captured a lunar eclipse for the first time ever.]

May 5 and 6- Eta Aquarids Meteor Shower

We were not kidding when we said that May 5 is a big day for celestial events! The Eta Aquarids Meteor Shower is expected to peak on May 5 and 6, where roughly 10 to 30 meteors per hour can be seen. Eta Aquarid meteors are known to be speed demons, with some traveling at about 148,000 mph into the Earth’s atmosphere. These fast meteors can leave behind little incandescent bits of debris in their wake called trains. 

This meteor shower is usually active between April 19 and May 28 every year, peaking in early May. It’s radiant, or the point in the sky where the meteors appear to come from, is in the direction of the constellation Aquarius and the shower is named for the constellation’s brightest star, Eta Aquarii. It is also one of two meteor showers created by the debris from Comet Halley.

The Eta Aquarids are visible in the Northern and Southern Hemispheres just before dawn, but the Southern Hemisphere has a better chance of seeing more of the Eta Aquarids.

May 27-30- Lāhaina Noon

This twice a year event in the Earth’s tropical region is when the sun is directly overhead around solar noon. At this point, upright objects do not cast shadows. It happens in May and then again in July.

According to the Bishop Museum, in English, the word “lāhainā” can be translated as “cruel sun,” and is a reference to severe droughts experienced in that part of the island of Maui in Hawaii. An older term in ʻŌlelo Hawaiʻi is “kau ka lā i ka lolo,” which means “the sun rests upon the brain” and references both the physical and cultural significance of the event

May 29- Mercury at Greatest Western Elongation

The planet Mercury will reach its greatest separation from the sun in late May and into June. It may be difficult to see from the United States, but is expected to reach this point in pre-dawn hours beginning on May 29. 

The same skygazing rules that apply to pretty much all space-watching activities are key this month: Go to a dark spot away from the lights of a city or town and let the eyes adjust to the darkness for about a half an hour. 

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On April 19, 2021, a little more than a century after the Wright Brothers’ first test flight on Earth, humans managed to zoom a helicopter around on another planet. The four-pound aircraft, known as Ingenuity, is part of NASA’s Mars2020 exploration program, along with the Perseverance rover.

The dynamic duo made history again this month, as Ingenuity celebrated its landmark 50th flight. The small aircraft was built to fly only five times—as a demonstration of avionics customized for the thin Mars air, not a key part of the science mission—but it has surpassed that goal 10 times over with no signs of slowing down.

[Related: InSight says goodbye with what may be its last wistful image of Mars]

“Ingenuity has changed the way that we think about Mars exploration,” says Håvard Grip, NASA engineer and former chief pilot of Ingenuity. Although the helicopter started as a tech demo, proving that humans could make an aircraft capable of navigating the thin Martian atmosphere, it has become a useful partner to Percy. Ingenuity can zip up to 39 feet into the sky, scout the landscape, and inform the rover’s next moves through the Red Planet’s rocky terrain.

In the past months, Perseverance has been wrapping up its main science mission in Jezero Crater, a dried-up delta that could give astronomers insight on Mars’ possibly watery past and ancient microbial life. Ingenuity has been leap-frogging along with the rover, taking aerial shots of its robotic bestie and getting glimpses into the path ahead. This recon helps scientists determine their priorities for exploration, and helps NASA’s planning team prepare for unexpected hazards and terrain.

Unfortunately, the narrow channels in the delta are causing difficulties for the helicopter’s communications with the rover, forcing them to stay close together for fear of being irreparably separated. Ingenuity also can’t fall behind the rover, because its limited stamina (up to 3-minute-long flights at time) means it might not be able to catch up. Over the past month, the team shepherded the pair through a particularly treacherous stretch of the drive, though, and they’re still going strong—even setting flight speed and frequency records at the same time. Meanwhile, Percy has been investigating some crater walls and funky-colored rocks, of which scientists are trying to figure out the origins.

Ingenuity has certainly proven the value of helicopters in planetary exploration, and each flight adds to the pile of data engineers have at their disposal for planning the next generation of aerial robots. “When we look ahead to potential future missions, helicopters are an inevitable part of the equation,” says Grip.

What exactly comes next for Ingenuity itself, though, is anyone’s guess. “Every sol [Martian day] that Ingenuity survives on Mars is one step further into uncharted territory,” Grip adds. And while the team will certainly feel a loss when the helicopter finally goes out, they’ve already completed their main mission of demonstrating that the avionics can work. All the extra scouting and data collection is a reward for building something so sturdy. 

[Related: Two NASA missions combined forces to analyze a new kind of marsquake]

They’re now continuing to push the craft to its limits, testing out how far they can take this technology. For those at home who want to follow along, the mission actually provides flight previews on Ingenuity’s status updates page. 

“It may all be over tomorrow,” says Grip. “But one thing we’ve learned over the last two years is not to underestimate Ingenuity’s ability to hang on.” 

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Black holes remain among the most enigmatic objects in the universe, but the past few years have seen astronomers develop techniques to directly image these powerful vacuums. And they keep getting better at it.

The Event Horizon Telescope (EHT) collaboration, the international team that took the first picture of a black hole in 2017, followed up that work with observations highlighting the black hole’s magnetic field. And just this month, another team of astronomers created an AI-sharpened version of the same image.

Now a new study published today in the journal Nature describes how images of that black hole, named after its galaxy, Messier 87 (M87), has a much larger circle of debris around it than the 2017 observations would suggest. 

Though long hypothesized to exist in theory, for many decades astronomers could only find indirect evidence of black holes in the sky. For instance, they would look for signs of the immense gravity of a black hole influencing other objects, such as when stars follow especially tight or fast orbits that imply the presence of another massive, but invisible partner.

But that all changed in 2017, when the EHT’s global network of radio telescopes captured the first visible evidence of a black hole, the supermassive black hole at the heart of a galaxy 57 million light-years away from Earth. When the image was released in 2019, the orange ring of fire around a central black void drew comparisons to “The Eye of Sauron” from Lord of the Rings.

EHT would go on to directly image Sagittarius A*, the supermassive black hole at the heart of the Milky Way galaxy, releasing another image of a fiery orange doughnut around a black center in May 2022.

Such supermassive black holes, which are often billions of times more massive than our sun—M87 is estimated to be 6.5 billion times bigger and Sagittarius A*  4 million times bigger—are thought to exist at the centers of most galaxies. The intense gravity of all that mass pulls on any gas, dust, and other excess material that comes too close, accelerating it to incredible speeds as it falls toward the lip of the black hole, known as the event horizon.

[Related: What would happen if you fell into a black hole?]

Like water circling a drain, the falling material spirals and is condensed into a flat ring known as an accretion disk. But unlike water around a drain, the incredible speed and pressures in the accretion disk heat the inflating material to the point where it emits powerful X-ray radiation. The disk propels jets of radiation and gas out and away from the black hole at nearly the speed of light.  

The EHT team already figured that M87 produced forcible jets. But the second set of results show that the ring-like structure of collapsing material around the black hole is 50 percent larger than they originally estimated.

“This is the first image where we are able to pin down where the ring is, relative to the powerful jet escaping out of the central black hole,” Kazunori Akiyama, an MIT Haystack Observatory research scientist and EHT collaboration member, said in a statement. “Now we can start to address questions such as how particles are accelerated and heated, and many other mysteries around the black hole, more deeply.”

The new observations were made in 2018 using the Global Millimeter VLBI Array, a network of a dozen radio telescopes running east to west across Europe and the US. To get the resolution necessary for more accurate measurements, however, the researchers also included observatories in the North and South: the Greenland Telescope along with the Atacama Large Millimetre/submillimetre Array, which consists of 66 radio telescopes in the Chilean high desert.

“Having these two telescopes [as part of] the global array resulted in a boost in angular resolution by a factor of four in the north-south direction,” Lynn Matthews, an EHT collaboration member at the MIT Haystack Observatory, said in a media statement. “This greatly improves the level of detail we can see. And in this case, a consequence was a dramatic leap in our understanding of the physics operating near the black hole at the center of the M87 galaxy.”

[Related: Construction starts on the world’s biggest radio telescope]

The more recent study focused on radio waves around 3 millimeters long, as opposed to 1.3 millimeters like the original 2017 one. That may have brought the larger, more distant ring structure into focus in a way the 2017 observations could not.

“That longer wavelength is usually associated with lower energies of the emitting electrons,” says Harvard astrophysicist Avi Loeb, who was not involved with the new study. “It’s possible that you get brighter emission at longer wavelengths farther out from the black hole.”

Going forward, astronomers plan to observe the black hole at other wavelengths to highlight different parts and layers of its structure, and better understand how such cosmic behemoths form at the hearts of galaxies and contribute to galactic evolution.

Just how supermassive black holes generate jets is “not a well-understood process,” Loeb says. “This is the first time we have observations of what may be the base of the jet. It can be used by theoretical physicists to model how the M87 jet is being launched.” 

He adds that he would like to see future observations capture the sequence of events in the accretion disk. That is, to essentially make a movie out of what’s happening at M87.

“There might be a hotspot that we can track that is moving either around or moving towards the jet,” Loeb says, which in turn, could explain how a beast like a black hole gets fed.

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A commercial lunar rover, developed by the private Japanese company ispace in partnership with the United Arab Emirates, appears to have failed to achieve a soft lunar landing, and is presumed to have crashed on the moon’s surface. The mission’s apparent conclusion comes after four-month, 239,000 mile sojourn, and if successful, could have signaled a new era of lunar exploration.

“We have to assume that we could not complete the landing on the lunar surface,” ispace CEO Takeshi Hakamada said during the company’s livestream.

Launched aboard a SpaceX Falcon 9 rocket on December 11, ispace’s Hakuto-R lander attempted to make a soft landing (i.e. not crash) inside the Atlas Crater located on the southeastern edge of the moon’s Mare Frigoris, or the “Sea of Cold” just before 1pm EST. The ispace team failed to subsequently establish communication with the lander, and as of writing, remains unable to do so.

“Recognizing the possibility of an anomaly during the mission, the results will be weighed and evaluated against the criteria and incorporated into future missions already in development between now and 2025,” the company said in an announcement shortly following its December 11 launch aboard the SpaceX Falcon 9.

Had it been a success, the UAE’s 22-pound Rashid rover would have deployed for a 14-day lunar daytime survey of the area. According to the European Space Agency—which aided in designing the rover’s wheels, and will provide lander communications for ispace—the rover would have documented its trip via two high resolution cameras alongside both a microscopic and thermal imaging camera. Rashid also boasted a “Langmuir probe” intended to “sample the plasma environment prevailing just above the lunar surface,” per the ESA.

[Related: ispace’s private lander might be the first to touch down on the moon.]

As CNN notes, only the US, China, and the former Soviet Union have ever successfully pulled off a controlled moon landing. America still remains the only nation to place humans on the moon’s surface. In 2019, the Israeli private space company SpaceIL attempted what would have been the first commercial moon soft landing with its Beresheet robotic lander. Beresheet’s engine failed during its descent approximately four miles above the lunar surface.

The hoped-for success of ispace’s Hakuto-R could have presented literal and figurative uncharted territory for both Earthbound nations and their moon. Alongside NASA astronauts’ impending return via the Artemis program ahead of hopes for a permanent lunar base, many space law experts are rushing to establish a new set of regulations to protect the lunar environment, as well as historic spaces like the Apollo 11 landing site.

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Even the tallest trees, biggest blue whales, and even giant gleaming stars were once babies. Protostars are the hot core of energy that will one day become stars and galaxies. The formative years of our universe’s history, when billions of stars and galaxies formed and assembled after the Big Bang, have so far been beyond our understanding.

[Related: These 6 galaxies are so huge, they’ve been nicknamed ‘universe breakers’]

Now, NASA’s James Webb Space Telescope (JWST) confirmed the distance of a protocluster of seven galaxies that formed only 650 million years after the Big Bang, or what astronomers call redshift 7.9. The findings were published April 24 in the Astrophysical Journal Letters and are the “earliest galaxies yet to be spectroscopically confirmed as part of a developing cluster.”

Based on the data collected, a team of astronomers calculated the nascent cluster’s future development. It will likely grow in size and mass to resemble the Coma Cluster, one of the densest galaxies of the modern universe. 

“This is a very special, unique site of accelerated galaxy evolution, and Webb gave us the unprecedented ability to measure the velocities of these seven galaxies and confidently confirm that they are bound together in a protocluster,” co-author and IPAC-California Institute of Technology astronomer Takahiro Morishita said in a statement.

JWST’s Near-Infrared Spectrograph (NIRSpec) captured the key measurements to confirm both the galaxies’ collective distance and the high velocities at which they are moving within a halo of dark matter. They’re moving through space at more than two million miles per hour, or over 600 miles per second. 

Having this spectral data in hand allowed the astronomers to model and map the future development of the gathering group all the way up to the modern universe. If it does follow the prediction and eventually resemble the Coma Cluster, it could eventually be among the densest known galaxy collections.

“We can see these distant galaxies like small drops of water in different rivers, and we can see that eventually they will all become part of one big, mighty river,” co-author and National Institute of Astrophysics in Italy astronomer Benedetta Vulcani said in a statement.

According to NASA, galaxy clusters are the greatest concentrations of mass in the known universe. They can dramatically warp the fabric of spacetime itself. This warping is called gravitational lensing and can have a magnifying effect for the objects located beyond the cluster. This allows astronomers to see through the cluster as if it were a giant cosmic magnifying glass.  The team in this study was able to utilize this enlarging effect and look through Pandora’s Cluster to view the protocluster.

[Related: JWST’s latest new galaxy discoveries mirror the Milky Way.]

Exploring how big clusters like Pandora and Coma first came together has historically been difficult because the expansion of the universe stretches light beyond visible wavelengths into the infrared. JWST’s sophisticated infrared instruments were developed to fill in these gaps at the beginning of the universe’s story. 

The team anticipates that future collaboration between JWST and a high-resolution, wide-field survey mission from NASA’s Nancy Grace Roman Space Telescope will allow for even  more results on early galaxy clusters. Roman will be able to identify more protocluster galaxy candidates, while JWST can follow up to confirm these findings with its spectroscopic instruments. Currently, the Roman mission is targeted to launch by May 2027.

“It is amazing the science we can now dream of doing, now that we have Webb,” co-author and University of California, Los Angeles astronomer Tommaso Treu said in a statement. “With this small protocluster of seven galaxies, at this great distance, we had a one hundred percent spectroscopic confirmation rate, demonstrating the future potential for mapping dark matter and filling in the timeline of the universe’s early development.”

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In 1989, Chuck Berry and Carl Sagan partied it up at one of the biggest bashes of the summer—a celebration honoring the two Voyager spacecrafts, who were about to make a dramatic exit from our solar system. 

The twin probes, Voyager 1 and Voyager 2, launched back in 1977, with only a five-year mission to take a gander at Jupiter and Saturn’s rings and moons, hauling the Golden Record containing messages and cultural snapshots from Earth (including Chuck Berry’s music). 

Obviously, the Voyager spacecrafts have persisted a lot longer than five years: 46 years, to be exact. They’re still careening through space at a distance between 12 and 14 billion miles from Earth. So how have they lasted four decades longer than expected? Much of it has to do with a bit of vintage hardware and a handful of software updates. You can find out more (and when the crafts’ expected death dates) by subscribing to PopSci+ and reading the full story by Tatyana Woodall, and by listening to our new episode of Ask Us Anything. 

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Humans have used radio waves to communicate across Earth for more than 100 years. Those waves also leak out into space, a fingerprint of our presence propagating through the cosmos. In more recent years, humans have also sent out a stronger signal beyond our planet: communications with our most distant probes, like the famous Voyager spacecraft.

Scientists recently traced the paths of these powerful radio transmissions from Earth to multiple far-away spacecraft and determined which stars—along with any planets with possible alien life around them—are best positioned to intercept those messages. 

The research team created a list of stars that will encounter Earth’s signals within the next century and found that alien civilizations (if they’re out there) could send a return message as soon as 2029. Their results were published on March 20 in the journal Publications of the Astronomical Society of the Pacific.

“This is a famous idea from Carl Sagan, who used it as a plot theme in the movie Contact,” explains Howard Isaacson, a University of California, Berkeley astronomer and co-author of the new work. 

[Related: UFO research is stigmatized. NASA wants to change that.]

However, it’s worth taking any study involving extraterrestrial life with a grain of salt. Kaitlin Rasmussen, an astrobiologist at the University of Washington not affiliated with the paper, calls this study “an interesting exercise, but unlikely to yield results.” The results, in this case, would be aliens contacting Earth within a certain timeframe.

As radio signals travel through space, they spread out and become weaker and harder to detect. Aliens parked around a nearby star probably won’t notice the faint leakage from TVs and other small devices. However, the commands we send to trailblazing probes at the edge of the solar system—Voyager 1, Voyager 2, Pioneer 10, Pioneer 11, and New Horizons—require a much more focused and powerful broadcast from NASA’s Deep Space Network (DSN), a global array of radio dishes designed for space communications.

The DSN signals don’t magically stop at the spacecraft they’re targeting: They continue into interstellar space where they eventually reach other stars. But electromagnetic waves like radio transmissions and light can only travel so fast—that’s why we use light-years to measure distances across the universe. The researchers used this law of physics to estimate how long it will take for DSN signals to reach nearby stars, and for alien life to return the message. 

The process revealed several insights. For example, according to their calculations, a signal sent to Pioneer 10 reached a dead star known as a white dwarf around 27 light-years away in 2002. The study team estimates a return message from any alien life near this dead star could reach us as soon as 2029, but no earlier. 

[Related: Nothing can break the speed of light]

More opportunities for return messages will pop up in the next decade. Signals sent to Voyager 2 around 1980 and 1983 reached two stars in 2007: one that’s 26 light-years away and a brown dwarf that’s 24 light-years away, respectively. If aliens sent a message right back from either, it could reach Earth in the early 2030s.

This work “gives Search for Extraterrestrial Intelligence researchers a more narrow group of stars to focus on,” says lead author Reilly Derrick, a University of California, Los Angeles engineering student.  

Derrick and Isaacson propose that radio astronomers could use their star lists to listen for return messages at predetermined times. For example, in 2029 they may want to point some of Earth’s major radio telescopes towards the white dwarf that received Pioneer 10’s message.

But other astronomers are skeptical. “If a response were to be sent, our ability to detect it would depend on many factors,” says Macy Huston, an astronomer at Penn State not involved in the new study. These factors include “how long or often we monitor the star for a response, and how long or often the return signal is transmitted.”

There are still many unknowns when considering alien life. In particular, astronomers aren’t certain the stars in this study even have planets—although based on other exoplanet studies, it’s likely that at least a fraction of them do. The signals from the DSN are also still incredibly weak at such large distances, so it’s unclear how plausible it is for other stars to detect our transmissions.

“Our puny and infrequent transmissions are unlikely to yield a detection of humanity by extraterrestrials,” says Jean-Luc Margot, a University of California, Los Angeles radio astronomer who was not involved in the recent paper. He explains that our radio transmissions have only reached one-millionth of the volume of the Milky Way. 

“The probability that another civilization resides in this tiny bubble is extraordinarily small unless there are millions of civilizations in the Milky Way,” he says. But if they’re out there, there might be a time and place to capture the evidence.

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Last week’s much-hyped test flight of SpaceX’s Starship, the most powerful rocket ever constructed, ended in a fiery explosion minutes after launch, falling far short of the SpaceX team’s optimistic goal of a watery landing near Hawaii. The truncated conclusion was not entirely surprising, however—SpaceX CEO Elon Musk himself estimated a 50 percent chance of failure while speaking at a conference last month. Regardless of how one views the launch postmortem, one thing is for certain—Starship made its presence known to locals last week, and left an absolute mess in its wake.

[Related: Watch SpaceX’s giant Starship rocket explode.]

Hailed as a success by many SpaceX fans and a dud by some of its critics, Friday’s historic Starship launch was nothing if not “truly terrifying” for those living near the Boca Chica, Texas, launchsite. According to a report from The New York Times, “virtually everywhere” in the neighboring town of Port Isabel was covered in a layer of thick dust and sand grain. The force from Starship’s 33 Raptor engines also generated enough power to resemble a “mini earthquake,” residents told the The NY Times, and resulted in at least one store owner’s window shattering. Starship’s takeoff blasted a 25-feet deep crater into the launch site, sending up plumes of dust and dirt, alongside bowling ball-sized debris that smashed into at least one empty parked NASA Spaceflight van nearby. This isn’t the first instance of SpaceX-induced damage, either—in 2021, a SpaceX disintegrating Falcon 9 rocket stage’s pressure vessel landed on a Washington State farm, leaving a four-inch dent in the ground.

As Space.com explained over the weekend, locals have also voiced concerns over future Starship launches’ effects on local flora and fauna. SpaceX’s Starbase facilities are located near wildlife refuge areas—while such rocketry complexes are often built in similar remote areas, safety steps and safe-distance requirements generally minimize harm and disruption. On April 19, one day before Starship’s rescheduled launch, 27 environmental, community, and indigenous organizations signed an open letter expressing concerns over the massive rocket’s effects on both locals and the environment. This includes sacred land for local indigenous peoples.

“We, the Carrizo Comecrudo Tribe of Texas, oppose SpaceX operations destroying our sacred lands,” Tribal Chairman, Juan B. Mancias, said in the co-signed statement, adding “The Tribe was never consulted by any of these companies or electeds about rockets… who never responded to our request for a meeting.”

“SpaceX routine operations and testing are already destroying wildlife refuges and sacred lands of the Carrizo Comecrudo Tribe of Texas and are threatening Rio Grande Valley communities with explosion risks,” reads a portion of the letter. “SpaceX [cut] off access to the beach from local families, preventing the Carrizo Comecrudo Tribe from accessing sacred lands for ceremonies, destroying more than 60 acres of wildlife habitat for threatened and endangered species, and threatening public safety with rocket shrapnel blown into fishing spots and the community.”

Last June, the Federal Aviation Administration concluded SpaceX’s upcoming orbital launch plans would result in “no significant impact” to the nearby region, pending 75 action steps to mitigate environmental concerns. Musk claims his private spacefaring company will have another Starship ready to launch from the same facility in “1 to 2 months.”

Update 4/25/23:  The Federal Aviation Administration (FAA) confirmed to CNBC on Monday afternoon that it has grounded the company’s Starship Super Heavy launch program pending results of the “mishap investigation” which was “triggered by debris entering adjacent properties.”

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SpaceX’s mega-rocket Starship exploded earlier today. Using a Super Heavy booster for the first time below Starship itself, the entire vehicle assembly failed minutes after rising from the launch pad in southern Texas. 

A radiating light and brown smoke at the base of the rocket, followed by cheers, marked the beginning of the launch. All appeared to go according to plan as fiery exhaust propelled the double-deck rocket assembly higher into the atmosphere. Crowds and commenters waited to see the silvery rocket and white booster separate as planned—and then kept waiting as the rocket eventually started flipping and spinning. Then, the rocket, which was uncrewed, exploded. 

SpaceX was aiming to send the biggest and most powerful rocket ever built on a trip around the world. If all had gone according to plan, the Starship upper stage would have terminated its flight in the water near Hawaii. That didn’t happen.

This launch was originally scheduled for Monday, but a stuck booster valve delayed the project.

[Related: SpaceX Starships keep exploding, but it’s all part of Elon Musk’s plan]

The launch included two stages: one using the Starship rocket, which has blasted off before. Starship finally landed in 2021 without blowing up after multiple failures and explosions. And the second, a Super Heavy booster, is a new addition designed to propel the rocket farther. This was the first launch with those two sections together.

The plan was to launch from the southern tip of Texas, drop the booster in the Gulf of Mexico, and have Starship cross over the Atlantic, Indian, and Pacific oceans before going for a swim into the Pacific near Hawaii. 

Crowds had gathered a few miles away from SpaceX’s launch site, Boca Chica Beach in Texas, to watch the launch. The ultimate goal of the rocket is to shuttle humans and cargo to the Moon and eventually Mars, but that goal might be farther away than the places it hopes to reach. 

“I’m not saying it will get to orbit, but I am guaranteeing excitement. It won’t be boring,” Musk said at a Morgan Stanley conference last month. He estimated it might have a 50 percent chance of reaching orbit.

Though Starship and it’s booster failed to separate, SpaceX still sees this as a success. “It does appear to be spinning, but I do want to remind everyone that everything after clearing the tower was icing on the cake,” one SpaceX announcer said during the event; the vehicle exploded while she made the comment, leading to cheers. She added that it was “an exciting end to the Starship inaugural integrated test flight.” 

The Starship’s Super Heavy booster has 33 methane-fueled engines, and the ship itself could theoretically accommodate 250 tons and 100 people. Before sending any passengers to new destinations, Musk wants to use the unmanned rocket to launch satellites, such as his own Starlinks, into Earth’s orbit. 

Watch all the fiery drama, below:

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Of all the celestial events lighting up the sky this month, the Lyrid meteor shower has the potential to be one of the most spectacular. The annual event began on April 16 and will peak this weekend before wrapping up on April 25. You won’t need any special equipment to catch a glimpse—just your eyes and a clear night sky—but it helps to know when and where to look.

When to watch the meteor shower

In the northern hemisphere, you can look skyward beginning around 10 p.m. local time on Friday, April 21 and Saturday, April 22 into the early morning hours of the 23rd. The predicted peak is for Sunday, April 23 at 9 p.m. Eastern Time (1:06 Universal Time). This year, the Lyrids’ peak is quite narrow, but moonlight will not interfere with the meteor shower like it did in 2021 and 2022.

[Related: How to photograph a meteor shower]

“Serious observers should watch for at least an hour, as numerous peaks and valleys of activity will occur,” the American Meteor Society recommends.  “If you only view for a short time it may coincide with a lull of activity. Watching for at least an hour guarantees you will get to see the best this display has to offer.”

Where to look for the Lyrids

The Lyrids are named after the constellation Lyra, which is the constellation closest to their radiant—where the meteors appear to originate. Look toward a blue-white star named Vega, the brightest glimmer in the constellation. In the northern hemisphere this time of year, Lyra appears almost directly overhead around midnight. In southern latitudes, Lyra appears lower in the northern part of the sky. 

Once you’ve spotted Vega or Lyra, start to look for streaks of light in the night sky. It is best to watch from a location away from city lights and to let your eyes adjust to the darkness for at least 30 minutes beforehand. The International Dark Sky Association has an online tool to help locate designated dark sky parks that protect nocturnal environments.

What you may see… including fireballs

In a dark sky with no moon, you may be able to glimpse 10 to 20 meteors per hour. The Lyrids can have uncommon surges in activity that bring rates up to 100 meteors per hour. The Lyrid meteor shower appears to outburst, or produce an unexpectedly large number of meteors, about every 60 years, with the next outburst expected in 2042. 

During the last half of April in recent years, irregular numbers of very bright meteors have been observed coming from the southern part of the sky during the Lyrids. Sometimes, these fireballs drop as meteorites, and could be the remnants of a broken-up asteroid instead of a comet. An asteroid is a small, rocky object that appears as a point of light in a telescope. Comets are also planetary objects that orbit the sun, but they’re composed of ice and dust that vaporize when they get closer to the sun. This makes comets appear more fuzzy or with a tail in a telescope.

[Related: Scientists finally solve the mystery of why comets glow green.]

This year, a “window of opportunity” for a possible fireball sighting may be between 5 p.m. ET on April 23 and 7 p.m. ET on April 25, according to Space.com.

Most meteor showers are the result of debris from a passing comet, and the Lyrids are no different. The source of these space rocks is Comet Thatcher, which astronomers first noticed in 1861. At that time, the comet was at its most recent perihelion—its closest point to the sun. It will reach its farthest point from the sun close to 2070 and will hit perihelion again around 2283.

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Heads up, everyone: a 600-pound, decommissioned satellite is on track to fall from orbit on Wednesday. While most of it is expected to burn up upon reentry, “some components are expected to survive,” according to NASA. Don’t worry; there’s probably no need to run for shelter, as the agency estimates that the odds for personal harm are around 1 in 2,467.

Per the space agency’s announcement, the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) is expected to re-enter Earth’s atmosphere on April 19 at approximately 9:30 pm EDT, give or take roughly 16 hours. First launched into low-Earth orbit in 2002, RHESSI was tasked with observing solar flares and coronal mass ejections through X-rays and gamma rays emitted by the sun. The data collected by RHESSI helped scientists better understand the events’ physics, as well as how they are created. According to NASA, such flares routinely emit the energy equivalent of billions of megatons of TNT “within minutes.” Here on Earth, these blasts frequently disrupt electrical grids and systems across the globe.

“RHESSI even made discoveries not related to flares, such as improving measurements of the Sun’s shape, and showing that terrestrial gamma-ray flashes—bursts of gamma rays emitted from high in Earth’s atmosphere over lightning storms—are more common than previously thought,” NASA writes in their announcement.

[Related: The FCC is finally pulling the reins on space junk.]

During its 16-year-long tenure above earth, RHESSI recorded over 100,000 X-ray events, but was finally decommissioned in 2018 following increasing communications difficulties. For the past five years, RHESSI has quietly orbited Earth alongside an estimated 30,000 fellow pieces of debris. As Space.com also pointed out on Monday, its impending atmospheric reentry once again highlights the growing issue of space junk above everyone’s heads. While RHESSI’s return is planned and closely monitored, the larger problem has attracted increasing attention, particularly following the undirected reentry of a 23-ton portion of Chinese rocket detritus in 2021. That same year, an unannounced Russian military exercise sent shards of an exploded satellite hurtling towards the International Space Station. The ISS crew was briefly forced to lockdown, although neither they nor the space station was injured.

There are currently a number of suggestions for decluttering the crowded skies, including shooting nets to drag debris back towards Earth, and using tiny, clawed satellite robots to help clean up the mess. Last week, the Federal Communications Commission officially launched its Space Bureau tasked with a variety of responsibilities, including handling orbital trash. In a statement, the new bureau’s director, Julie Kearney, explained, “The first thing we’re really focused on, of course, is modernizing regulations to match our new realities and supporting tech innovation,” while also “simultaneously focusing on space, orbital debris and space safety.”

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Since 1995 scientists have found more than 5,000 exoplanets—other worlds beyond our solar system. But while space researchers have gotten very good at discovering big planets, smaller ones have evaded detection.

However, a novel astronomy detection technique known as microlensing is starting to fill in the gaps. Experts who are a part of the Korea Microlensing Telescope Network (KMTNet) recently used this method to locate three new exoplanets about the same sizes as Jupiter and Saturn. They announced these findings in the journal Astronomy & Astrophysics on April 11. 

How does microlensing work?

Most exoplanets have been found through the transit method. This is when scientists use observatories like the Kepler Space Telescope and the James Webb Space Telescope to look at dips in the amount of light coming from a star. 

Meanwhile, gravitational microlensing (usually just called microlensing) involves searching for increases in brightness in deep space. These brilliant flashes are from a planet and its star bending the light of a more distant star, magnifying it according to Einstein’s rules for relativity. You may have heard of gravitational lensing for galaxies, which pretty much relies on the same physics, but on a much bigger scale.

The new discoveries were particularly unique because they were found in partial data, where astronomers only observed half the event.

“Microlensing events are sort of like supernovae in that we only get one chance to observe them,” says Samson Johnson, an astronomer at the NASA Jet Propulsion Lab who was not affiliated with the study. 

Because astronomers only have one chance and don’t always know when events will happen, they sometimes miss parts of the show. “This is sort of like making a cake with only half of the recipe,” adds Johnson.

[Related: Sorry, Star Trek fans, the real planet Vulcan doesn’t exist]

The three new planets have long serial-number-like strings of letters and numbers for names: KMT-2021-BLG-2010Lb, KMT-2022-BLG-0371Lb, and KMT-2022-BLG-1013Lb. Each of these worlds revolves around a different star. They weigh as much as Jupiter, Saturn, and a little less than Saturn, respectively. 

Even though the researchers only observed part of the microlensing events for each of these planets, they were able to rule out other scenarios that could confidently explain the signals. This work “does show that even with incomplete data, we can learn interesting things about these planets,” says Scott Gaudi, an Ohio State University astronomer who was not involved in the published paper.

The exoplanet search continues

Microlensing is “highly complementary” to other exoplanet-hunting techniques, says Jennifer Yee, a co-author of the new study and researcher at The Center for Astrophysics | Harvard & Smithsonian. It can scope out planets that current technologies can’t, including worlds as small as Jupiter’s moon Ganymede or even a few times the mass of Earth’s moon, according to Gaudi.

The strength of microlensing is that “it’s a demographics machine, so you can detect lots of planets,” says Gaudi. This ability to detect planets of all sizes is crucial for astronomers as they complete their sweeping exoplanet census to determine the most common type of planet and the uniqueness of our own solar system. 

Astronomers are honing their microlensing skills with new exoplanet discoveries like those from KTMNet, ensuring that they know how to handle this kind of data before new space telescopes come online in the next few years. For example, microlensing will be a large part of the Roman Space Telescope’s planned mission when it launches mid-decade. 

“We’ll increase the number of planets we know by several thousand with Roman, maybe even more,” says Gaudi. “We went from Kepler being the star of the show to TESS [NASA’s Transiting Exoplanet Survey Satellite] being the star of the show … For its time period, Roman [and microlensing] will be the star of the show.”

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PLANTS ARE CRUCIAL to human survival, even when there’s no sunlight. But dealing with darkness is second nature for someone with a green thumb like Howard Levine, chief scientist for NASA’s International Space Station (ISS) Research Office. Nurturing leaves outside Earth’s atmosphere is not only important for cycling nutrients and water during future space voyages, but also helps alleviate the cooped-up feeling astronauts experience. “On the ISS, you’re up there for six months at a time. People often say it’s like being in the bathroom with six of your best friends,” says Levine, who has been growing plants in orbit for decades.  

Space might be an extreme example, but cramped, dark dwellings exist on the ground too. Keeping your houseplants alive in windowless rooms, in shadowy corners, or during short winter days can be a challenge. Luckily, there are strategies to help your flora stay lush and verdant, even when their sunny source of energy is limited. 

Mini indoor greenhouses

Darkness usually means a dip in natural heat. Colder temperatures slow our bodies down, and that’s true for plants too. The chemical reactions that control their growth decelerate and sometimes stop.  

In Iceland, horticulturist James McDaniel uses geothermal heat in his greenhouses to protect his plants from the wintry cold. Each of the structures has holes beneath that stretch deep to a pocket of steaming-hot water, he explains. “You can funnel that [steam] into the pipes through the greenhouse and use natural ventilation to keep the temperature a set range.” 

But you don’t need volcanic energy to run a mini indoor greenhouse, which can be as simple as a repurposed IKEA cabinet. A heater can add warmth, although you might want to pair it with a humidifier to keep from drying your houseplants out. For individual plants, glass dome cloches can trap heat from limited sunlight and also enclose water vapors, which protect plants from the crisp air conditioner in the summer and the prickly heater in the winter. 

Grow lights

Plant grow lights provide an easy and accessible energy boost in dim or pitch-black spaces. These specialized beams sport different features, colors, and prices. LEDs, for instance, are the cheapest and most energy-efficient option, using about a third of the electricity of old sodium lightbulbs.

While most devices stick to a warm white spectrum, plants respond differently to various illuminating hues. In Levine’s experiments on Earth, red light worked well for the slender flowering plants Arabidopsis. But in the ISS’s weightless environment, they stretched into funny shapes until he started adding blue lights. He eventually found a middle ground and doused the plants in green light at the request of astronauts who missed the familiar color.  

Bright surfaces

If electricity is a limiting factor, you can try to reflect light with mirrors or aluminum foil. Even brightening up your space with white decor, like a light-colored tablecloth, will cast a little glow onto your plants. While it’s not comparable to using a grow lamp or the sun (reflections don’t deliver as much energy), it could offer plants an extra boost. 

The makeup of your indoor garden will dictate how much brightness you need to add, Levine explains. Some flora, including lettuce and tomatoes, need more light than those like Arabidopsis; new seedlings need less light than fully grown plants. As you choose your seeds and seedlings, research their native ranges to learn how much sunshine they’d naturally get.

Plants are ultimately adaptable. They can stretch their stems toward available light sources or produce extra chlorophyll, the pigment that absorbs whatever luminescence is available. “Even though they may not be getting all the light that they would like for optimum growth, they’ll still grow,” says Levine. With only a little extra help, you and your plants can conquer the darkness. 

Read more PopSci+ stories.

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On Wednesday and Thursday, a particularly strange “hybrid” eclipse is coming to Australia, Indonesia, and some other parts of Southeast Asia, but you don’t have to be there to watch. Don’t miss it—the next one won’t happen for nearly another decade.

How to see the April 20 solar eclipse in person

The exact time of the eclipse will vary depending on your location, so you’ll need to check when it will be visible for you. Timeanddate.com has a particularly handy tool for figuring this out. To use it, click Path Map at the top of the page and see if you’re going to be under any part of the eclipse’s path. If so, zoom in to pinpoint where you are and click on the map to bring up an information box that shows when the event will be visible in local time.

Even if you’re in the partial eclipse zone, it’s worth stepping outside to take a peek at this celestial happening. “We are going to get coffee and freak out about the sky. It’s going to be fun,” says University of Melbourne astronomer Benji Metha about his eclipse plans. The moon will cover only about 10 percent of the sun where he is in southeastern Australia.

[Related: April 2023 stargazing guide]

If you’re in the eclipse’s path, be sure to come prepared. Never look directly at the sun. Eclipse glasses are readily available online, but make sure the ones you’re buying aren’t fake. Too late to buy? You can make your own eclipse projector instead. Unlike almost every other astronomical event, solar eclipses happen in the daytime, so you won’t really be able to spot other stars or deep sky objects at the same time. The sun and moon will be the only ones on stage.

Timeanddate is also hosting an eclipse livestream in collaboration with Perth Observatory in western Australia, where roughly 70 percent of the sun will be covered. Like Exmouth, Perth is 12 hours ahead of New York City, so live video will start at 10 p.m. ET on April 19 and continue until the partial eclipse ends around 12:46 a.m. ET on April 20.

Tune in, and you’ll be joining solar scientists around the world who are particularly interested in this event and the data they can gather from it. “I look forward to this eclipse, because it is a long-anticipated party,” says Berkeley heliophysicist Jia Huang. “A hybrid eclipse is very rare.”

When is the next eclipse?

If you miss the show, there are sure to be some incredible photos posted from the event, and you will be able to watch recordings online afterward. But if you want to see an eclipse in person, a few are coming to the States soon enough.

First, an annular solar eclipse will travel from Oregon to Texas on October 14, 2023, followed several months later by the next North American total solar eclipse from Texas up through Maine on April 8, 2024.

What to know about the four types of solar eclipses

Solar eclipses happen whenever Earth’s moon gets between us and the sun, aligning to block out the sunlight and cause an eerie daytime darkness. Eclipses are predictable, thanks to centuries of observational astronomy across many cultures, and “we can now forecast these events with incredible accuracy,” Metha says. It’s a good thing we know when they’re coming so we’re not surprised. “Imagine how many car accidents a sudden solar eclipse would cause if people were not expecting it,” he adds.

These celestial events come in a few flavors: total, partial, annular, and hybrid. In a total eclipse, the moon fully blocks out the sun. For a partial eclipse, the sun and moon aren’t quite lined up, so only a chunk of the sun is covered. Similarly, for an annular eclipse, some of the sun remains exposed—but this type happens when the moon is at its farthest point from Earth and appears smaller, creating a ring of light when it lines up with the sun. Hybrid eclipses, like the one happening this week, shift between total and annular due to the curvature of Earth.

Solar eclipses trace paths along Earth’s surface, with a path of totality—where you can see a total eclipse—in the center, surrounded by various shades of partial eclipse. The upcoming April 20 eclipse path of totality clips the northwestern corner of Australia and passes through the islands of Timor, Indonesia, and Papua New Guinea. The entirety of Australia, the Philippines, Malaysia, and parts of other Southeast Asian countries will experience at least a partial eclipse.

[Related: How worried should we be about solar flares and space weather?]

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It’s time for JUICE to get to work. The European Space Agency’s JUpiter ICy moons Explorer blasted off on an Ariane 5 rocket yesterday to begin its eight-year journey to the Jovian system to study Europa, Ganymede, and Callisto, three of the largest moons in the entire solar system.

Together with NASA’s Europa Clipper, which will launch in October 2024 but arrive at its destination a year earlier than JUICE, the missions will get the first close-ups of Jupiter’s icy moons since NASA’s Galileo probe visited the gas giant from 1995 and 2003.

“We learned about Europa having a subsurface ocean as a result of the Galileo mission,” says Emily Martin, a research geologist in the Center for Earth and Planetary Studies at the Smithsonian’s National Air And Space Museum. The Galileo finding ignited interest in so-called  “ocean worlds” that have liquid water under their thick surface ice and might be the best place to look for alien life in our solar system. Ganymede and Callisto are likely ocean worlds too.

[Related: Astronomers find 12 more moons orbiting Jupiter]

While Galileo captured some images of the lesser-known siblings, it couldn’t analyze their surfaces as well as originally plannedspacecraft was hamstrung from the beginning, when its high-gain antenna, necessary for sending back large amounts of data, failed to fully deploy. Consequently, when JUICE arrives at Jupiter in 2031, it will begin providing the first truly high-resolution studies of Ganymede and Callisto, and add to the data on Europa collected by the Europa Clipper. JUICE will use its laser altimeter to build detailed topographic maps of all three moons and use measurements of their magnetic and gravitational fields, along with radar, to probe their internal structures.

“Galileo did the reconnaissance,” Martin says, “and now JUICE gets to go back and really dig deep.”

Is there water on Jupiter’s moons?

If people know one Jovian moon, it’s likely Europa: The icy moon’s subsurface ocean has been the focus of science fiction books and movies. But Martin is particularly excited about what JUICE might find at Callisto. Jupiter’s second largest moon, it orbits farther out than Europa or Ganymede. It appears to be geologically inactive and may not be differentiated, meaning Callisto’s insides haven’t separated into the crust-mantle-core layers seen in other planets and moons.

Despite the low-key profile, data from the Galileo mission suggests Callisto could contain a liquid ocean like Europa and Ganymede. Understanding just how that could be possible, and getting a look at what Callisto’s interior really looks like, could help space researchers better understand how all of Jupiter’s moons evolved.

“In some ways, Callisto is a proto-Ganymede,” Martin says.

What comes after Mars?

It’s not just Callisto’s interior that is interesting, according to Scott Sheppard, an astronomer at the Carnegie Institution for Science. It’s the only large moon that orbits outside the belts of intense radiation trapped in Jupiter’s colossal magnetic field—radiation that can fry spacecraft electrics and human explorers alike. “If humanity is to build a base on one of the Jupiter moons, Callisto would be by far the first choice,” Sheppard says. “It could be the gateway moon to the outer solar system.”      

JUICE will fly by Europa, then Callisto, and then enter orbit around Ganymede, the largest moon in the solar system. With a diameter of around 3,270 miles, it’s larger than the planet Mercury, which comes in at 2,578 miles in diameter.

Geoffrey Collins, a professor of geology, physics and astronomy at Wheaton College, says he’s most excited about the Ganymede leg of the mission. “It will be the first time we’ve orbited a world like this, and I know we will be surprised by what we find.” 

If Ganymede hosts a liquid water ocean beneath its frozen shell how deep its crust is, and whether its suspected subsurface ocean is one vast cistern or consists of liquid layered with an icy or rocky mantle. JUICE will be the first mission to give scientists some real answers about to those questions.

“Even if JUICE just lets us reach a level of understanding of Ganymede like we had for Mars 20 or 30 years ago, it would be a massive leap forward from what we know now,” Collins says. “This will be the kind of thing that rewrites textbooks.”

[Related: A mysterious magma ocean could fuel our solar system’s most volcanic world]

Any clues that JUICE gathers from Ganymede and Callisto could apply to more than just Jupiter and its icy moons. They can tell us more about what to expect when we look further out from our own solar system, according to Martin.

“It contextualizes different kinds of ocean world systems and that has even broader implications to exoplanet systems,” she says. “The more we can understand the differences and the similarities between the ocean world systems that we have here in our solar system, the more prepared we’re going to be for understanding the planetary systems that we’re continuing to discover in other solar systems.”

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Astronomy sheds light on the far-off, intangible phenomena that shape our universe and everything outside it. Artificial intelligence sifts through tiny, mundane details to help us process important patterns. Put the two together, and you can tackle almost any scientific conundrum—like determining  the relative shape of a black hole. 

The Event Horizon Telescope (a network of eight radio observatories placed strategically around the globe) originally captured the first image of a black hole in 2017 in the Messier 87 galaxy. After processing and compressing more than five terabytes of data, the team released a hazy shot in 2019, prompting people to joke that it was actually a fiery donut or a screenshot from Lord of the Rings. At the time, researchers conceded that the image could be improved with more fine-tuned observations or algorithms. 

[Related: How AI can make galactic telescope images ‘sharper’]

In a study published on April 13 in The Astrophysical Journal Letters, physicists from four US institutions used AI to sharpen the iconic image. This group fed the observatories’ raw interferometry data into an algorithm to produce a sharper, more accurate depiction of the black hole. The AI they used, called PRIMO, is an automated analysis tool that reconstructs visual data at higher resolutions to study gravity, the human genome, and more. In this case, the authors trained the neural network with simulations of accreting black holes—a mass-sucking process that produces thermal energy and radiation. They also relied on a mathematical technique called Fourier transform to turn energy frequencies, signals, and other artifacts into information the eye can see.

Their edited image shows a thinner “event horizon,” the glowing circle formed when light and accreted gas crosses into the gravitational sink. This could have “important implications for measuring the mass of the central black hole in M87 based on the EHT images,” the paper states.

One thing’s for sure: The subject at the center of the shot is extremely dark, potent, and powerful. It’s even more clearly defined in the AI-enhanced version, backing up the claim that the supermassive black hole is up to 6.5 billion times heftier than our sun. Compare that to Sagittarius A*—the black hole that was recently captured in the Milky Way—which is estimated at 4 million times the sun’s mass.

Sagittarius A* could be another PRIMO target, Lia Medeiros, lead study author and astrophysicist at the Institute for Advanced Study, told the Associated Press. But the group is not in a rush to move on from the more distant black hole located 55 million light-years away in Messier 87. “It feels like we’re really seeing it for the first time,” she added in the AP interview. The image was a feat of astronomy, and now, people can gaze on it with more clarity.

Watch an interview where the researchers discuss their AI methods more in-depth below:

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ON THE WEBSITE Soar.Earth, you’ll find a map of the world that at first looks a lot like the one on Google Earth. But zoom in, and rectangles appear. Click on one, and you might find an image from a 1960s spy satellite showing a fresh crater from a nuclear-weapons test. Scoot to different coordinates, and see high-resolution satellite shots of last year’s floods in Western Australia. Northwest of that, there’s a map showing where Saudi Arabia has excavated for a futuristic, 110-mile-long city called The Line. 

The site’s founder, Amir Farhand, has big dreams for Soar: He hopes it will become the world’s biggest atlas, allowing users to see all the information that people have gathered about any point on Earth.

While achieving that dream is perhaps impossible, or at least a long way away, Soar already hosts oodles of historical maps, satellite shots from sources like NASA, and even cartography from scientific papers. Containing past and present maps while allowing users to also commission images from satellites, Soar can track the intersecting interests of many different groups: climate scientists, developers, intelligence analysts, mining experts, and defense contractors. 

The interests of the last two groups are, in fact, what spurred Soar’s creation.

Charted territory

Farhand, who lives in Australia, was always a plot-the-world kind of guy. He moved a lot as a kid, but wherever he was, he would ride his bike around his neighborhood and make maps of the surroundings.

After learning about satellite imagery and its relevance to Earth science in college, and then dropping out of a PhD program, Farhand became a consultant. He worked all over the world on geospatial projects. 

“Then I thought, You know what, I love atlases,” he says. “And I thought to myself, Why aren’t all the world’s atlases in one place?” 

Why wasn’t there a spot where he could overlay a leopard habitat range over a climatic map and so see the correlation? Why couldn’t he also see how someone had baroquely hand-drawn the area’s layout hundreds of years ago? Who wouldn’t want that?

Back then, around 2011, those were relatively idle questions for him. But in the years to come, Farhand would take them to work. In 2013, he created an application called Mappt—it contained the early seeds of what Soar would become. A few years after Mappt became available, a new customer took an interest: the US government. In 2017, a defense-centric version called Mappt Military appeared on the National Geospatial-Intelligence Agency’s official app store. Verified Department of Defense or intelligence community members could use it for free. It’s still available today, allowing users to map hazards, plan logistics and transport, and plot place-based risks, among other things. 

Defense users and also people in the mining industry were interested in using the technology to build their own private atlases, storing all their geospatial data in one spot, accessible from anywhere. The contents of those atlases ranged from modern drone and satellite photos to pictures taken from airplanes in the 1960s, and they wanted it in the field, offline. 

“It was all based on that premise of flexibility of having mapping data on your hands,” Farhand says. 

Soar rose, in a way, out of Mappt’s iterations. On the site, users can create their own private atlases—as the defense and mining companies wanted to—and include proprietary data, like satellite images they buy through the site. Or they can upload content for everyone to see, as long as they own its copyright or do their best to attribute public domain and out-of-copyright images. Or they can do both. Interacting with the site is free, as is creating an account, although some features (like making a private atlas) do cost money. Today, both Mappt and Soar.Earth are part of the parent company, Soar. 

On the Soar site, users can whip across the screen to anywhere on the planet and see if someone has uploaded an aerial photo from the 1950s, maps of flooding, maps of drought, and plots of elevation—all of which are available for, say, the city of Porto Alegre, Brazil. They can make measurements, add annotations, make different layers transparent and see how they overlap. 

The team is currently working through how best to moderate content on the platform to ensure it fits with Soar’s guidelines. Right now, anyone can upload maps in near real time if they agree their data fits with copyright and community guidelines. The Soar team generally logs in and checks on new uploads several times a day. Users can also report violations. Soon, though, the company will split users into two tiers: one of trusted power users who can automatically upload, and another that will have to await Soar’s approval before their maps appear. Farhand compares their policy to what you might find with Google Reviews or YouTube, noting that he’s “hopeful we can use precursor crowdsourcing platforms for directions on what to not to do, as much as what to do.”

If Soar doesn’t yet have the maps a user is looking for, they can request free NASA or Sentinel (a European satellite program) data of the area, buy brand-new shots from commercial satellites, or order archival images—all of which can be done through Soar and added to the public atlas of atlases. “They were very, very early into making it possible to just log into a website and buy satellite imagery,” says Joe Morrison, a vice president at Umbra, a company that takes radar-based data from space. 

Morrison writes a popular industry newsletter called “A Closer Look,” about “maps, satellites, and the businesses that create them,” and his analysis often laments the typical difficulty of buying shots from space: The pricing is opaque, the licensing is often restrictive, and actually opening the shutter can take so long the picture is no longer relevant. Soar aims to solve a lot of those problems. 

The combination and chronology of the data is interesting to people doing, say, climate research, tracking a conflict, or trying to suss out secret goings-on by using public data. Soar provides a platform on which users can do a form of what’s known as open-source intelligence, or OSINT, which can be a powerful way to track intra- or inter-country dynamics.

Morrison says what sets Soar apart from other geospatial endeavors is that it has focused on creating a community that publicly shares interactive maps. Most people aren’t going to pay for their own shiny satellite pictures, or spend all their free time aligning old National Geographic maps to the Soar lat-long grid, or adding daily updates on the big construction project across town. But some people will. 

Farhand thinks of the dynamic like that of YouTube: Many more people watch videos than create them. “We get this beautiful, enriching content from incredible specialists around the world,” he says of Soar’s homegrown influencers. “And then you’ve got these hordes of viewers that come on board.”

Spatial storytelling

One big-audience user who shares regular info on Soar goes by the handle War Mapper. They regularly post maps that consolidate updates on the conflict in Ukraine, showing the extent of territory controlled by Ukraine, or Russian-occupied territory, among other data. 

Another popular presence is Harry Stranger, a 23-year-old from Brisbane. “I would consider him an open-source analyst,” Morrison says. “He’s not really a journalist. He’s not really a military analyst. And he’s not just the normal amateur sleuth. He’s somewhere between.”

A while ago, Stranger, a space nerd, wanted to see a picture of a particular launchpad. Like so many interesting things, space infrastructure is hard to reach. You can’t just stroll up to a rocket’s spot on Cape Canaveral. And you definitely cannot do so at China’s Xichang Satellite Launch Center. “People can’t just walk up to and take a picture of it,” he says of such secure spots. But space offers a view of it all. And there aren’t really restrictions—despite rumors to the contrary—on what civilians can nab shots of.  

At some point, Stranger heard that he could get satellite images of the launchpad, for free, from Sentinel. “I became addicted,” he says.

Stranger started to keep an eye on various aerospace places in the world, particularly those located in countries that don’t give much public notice of their activities, like China. Was there construction? Is there a rocket rocking on the pad? Sometimes he hears a rumor and starts monitoring the site via satellite. Without having any insider knowledge, he could know more than he ever had before. “Space from space,” he calls his endeavors now.

When you can’t go through, don’t go around: Go above and look down. It is, after all, what the intelligence apparatus has been doing since the satellites that took the photos were invented. 

Stranger’s interest in monitoring earthly activity from above mirrors the more automated interests of intelligence programs, like the Intelligence Advanced Research Projects Activity’s SMART program, which aims to create software that can spot terrestrial changes, like heavy construction or new crop growth, from satellite imagery. 

Soon, Stranger was interested in what the intelligence types of the past had seen, which he was able to access through the lenses of old spy satellite systems whose images had since been cleared for public release. “I knew it existed out there,” he says of the declassified images. He didn’t think “out there” would end up being as easy as logging into the United States Geological Survey website, but it was.

If the formerly hushed images had already been scanned, he could download them for free, and he soon set up a GoFundMe to pay for the digitization of more. Soar, which Stranger hadn’t really used yet, donated $750.

“That’s where we kind of kicked off our relationship,” he says.

He started uploading the declassified imagery to Soar. Now, anyone can see US spy satellite shots of the Jiuquan Launch Center in China from the 1970s, along with a 2022 commercial-satellite image of a rocket test stand at the site, which was hit by an explosion the year before.

Guide to the planet

Right now, Soar hosts just under 100,000 different maps (excluding the shots from satellites like Sentinel, which add data all the time). Farhand estimates that this six-digit number is less than 0.0001 percent of the world’s total extant maps. “I don’t think that’s good enough,” he says. 

But if the company can get up to 1 or 2 percent of the total, he thinks, Soar could become as ubiquitous as Google Maps but with more context and community. That’s the dream anyway—a castle in the air that he’d like to tether to Earth. 

Read more PopSci+ stories.

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Few places in the solar system get hotter than the surface of the sun. But contrary to expectations, the tenuous tendrils of plasma in the outermost layer of its atmosphere—known as the corona—are way more searing than its surface.

“It is very confusing why the solar corona is farther away from the sun’s core, but is so much hotter,” says University of California, Berkeley space sciences researcher Jia Huang. 

The solar surface lingers around 10,000 degrees Fahrenheit, while the thin corona can get as hot as 2 million degrees. This conundrum is known as the coronal heating problem, and astronomers have been working on solving it since the mid-1800s.

“Simply speaking, solving this problem could help us understand our sun better,” says Huang. A better understanding of solar physics is also “crucial for predicting space weather to protect humans,” he adds. Plus, the sun is the only star we can send probes to—the others are simply too far away. “Thus, knowing our sun could help understand other stars in the universe.”

A brief history of the coronal heating problem

During the 1869 total solar eclipse—an alignment of the sun, moon, and Earth that blocks out the bulk of the sun’s light—scientists were able to observe the faint corona. Their observations revealed a feature in the corona that they took as evidence of presence of a new element: coronium. Improved theories of quantum mechanics over 60 years later revealed the “new element” to be plain old iron, but heated to a temperature that was higher than the sun’s surface.

[Related: We still don’t really know what’s inside the sun—but that could change very soon]

This new explanation for the puzzling 1869 measurement was the first evidence of the corona’s extreme temperature, and kicked off decades of study to understand just how the plasma got so hot. Another way of phrasing this question is, where is the energy in the corona coming from, and how is it getting there? 

“We know for sure that this problem hasn’t yet been resolved, though we have many theories, and the whole [astronomy] community is still enthusiastically working on it,” says Huang. There are currently two main hypotheses for how energy from the sun heats the corona: the motion of waves and an explosive phenomenon called nanoflares.

Theory 1: Alfvén waves

The surface of the sun roils and bubbles like a pot of boiling water. As the plasma convects—with hotter material rising and cooler material sinking down—it generates the sun’s immense magnetic field. This magnetic field can move and wiggle in a specific kind of wave, known as Alfvén waves, which then push around protons and electrons above the sun’s surface. Alfvén waves are a known phenomenon—plasma physicists have even seen them in experiments on Earth. Astronomers think the charged particles stirred up by the phenomenon might carry energy into the corona, heating it up to shocking temperatures.

Theory 2: Nanoflares

The other possible explanation is a bit more dramatic, and is kind of like the sun snapping a giant rubber-band. As the sun’s plasma tumbles and circulates in its upper layer, it twists the star’s magnetic field lines into knotted, messy shapes. Eventually, the lines can’t take that stress anymore; once they’ve been twisted too far, they snap in an explosive event called magnetic reconnection. This sends charged particles flying around and heats them up, a happening referred to as a nanoflare, carrying energy to the corona. Astronomers have observed a few examples of nanoflares with modern space telescopes and satellites.

The coronal heating mystery continues

As is usually the case with nature, it seems that the sun isn’t simply launching Alfvén waves or creating nanoflares—it’s more than likely doing both. Astronomers just don’t know how often either of these events happen.

[Related: Hold onto your satellites: The sun is about to get a lot stormier]

But they might get some straightforward answers soon. The Parker Solar Probe, launched in 2018, is on a mission to touch the sun, dipping closer to our star than ever before. It’s currently flying through some outer parts of the corona, providing the first up-close look at the movements of particles that may be responsible for the extreme temperatures. The mission has already passed through the solar atmosphere once, and will keep swinging around for a few more years—providing key information to help scientists settle the coronal heating problem once and for all.

“I would be very confident that we could make big progress in the upcoming decade,” says Huang.

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Update (April 14, 2023): After rescheduling the launch from April 13 to April 14 due to weather conditions, the European Space Agency successfully launched JUICE at 8:14 a.m. EDT and received its first transmission from the spacecraft around 10:30 a.m.

Space enthusiasts will get to have some JUICE for breakfast on Friday morning. The European Space Agency (ESA) is set to launch the Jupiter Icy Moons Explorer mission (JUICE) on April 14 from Europe’s Spaceport in Kourou, French Guiana at 9:14 a.m. local time (8:14 a.m. EDT). Curious viewers can watch the live broadcast beginning at 7:45 a.m. EDT on the ESA’s webpage.

The spacecraft is safe inside its Ariane 5 rocket, the same rocket that launched the James Webb Space Telescope (JWST) in December 2021. JUICE is Europe’s first-ever mission to the Jupiter system, and the spacecraft should be in our solar system’s largest planet’s orbit by July 2031.

[Related: Astronomers find 12 more moons orbiting Jupiter.]

According to the ESA, If the mission is delayed, the team can try again to launch JUICE once each day for the rest of April. If the spacecraft fails to launch this month, the next available slot is August 2023.

Once JUICE is launched, it will deploy its antennas, solar arrays, and other instruments. The explorer has two monitoring cameras that will capture parts of the solar array deployment following launch, according to the ESA. The 52 feet-long radar antenna will deploy a few days later. 

Over the eight years that it will take to reach Jupiter, the spacecraft will conduct three Earth flybys and one flyby of Venus. The flybys will give JUICE the spacecraft the necessary gravity assists so it can launch itself towards Jupiter, around 559 million miles away from Earth.

After it reaches Jupiter’s orbit in July 2031, JUICE will make detailed observations of Jupiter and three of its biggest moons, Ganymede, Callisto, and Europa. In 2034, JUICE is slated to go into orbit around Ganymede and will become the first human spacecraft to enter orbit around another planet’s moon. Ganymede is also the only moon in the solar system that has its own magnetic field. JUICE will study how this field interacts with the even larger magnetic field on Jupiter.

[Related: Dark matter, Jupiter’s moons, and more: What to expect from space exploration in 2023.]

NASA will provide the Ultraviolet Spectrograph (UVS) and subsystems and components for two additional JUICE instruments: the Particle Environment Package (PEP) and the Radar for Icy Moon Exploration (RIME) experiment. 

Studying Jupiter and its moons more closely will help astrobiologists understand how habitable worlds might emerge around gas giant planets, according to NASA. Jupiter’s moons are primary targets for astrobiology research, since moons like Europa are thought to have oceans of liquid water beneath their icy surfaces. Astrobiologists believe that these oceans could possibly be habitable for life.

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It took years of design and engineering toil to successfully get the largest-ever telescope mirror into space. Now, the James Webb Space Telescope’s trademark, 6.5-meter-in-diameter, gold-coated array orbits the sun 1.5 million kilometers above Earth, routinely providing stunning, previously inaccessible views of the universe. As incredible as its results are, however, a new, promising “mirror membrane” breakthrough is already in the works that could one day show scientists space in a new way.

According to a recent announcement from Germany’s Max Planck Institute for Extraterrestrial Physics, researcher Sebastian Rabien has reportedly designed a lighter, thinner, more cost-efficient reflective material that is hypothetically capable of producing telescope mirrors 15-20 meters wide. Detailed in a paper published with the journal Applied Optics, Rabien first evaporated a currently unspecified liquid within a vacuum chamber, which slowly deposits on interior surfaces before combining to form a polymer that eventually forms the mirror’s base.

[Related: Ice giant Uranus shows off its many rings in new JWST image.]

Telescope mirrors require a parabola shape to concentrate light towards a single spot. To achieve this, Rabien and his team positioned a rotating container containing additional liquid inside the vacuum chamber. That newly introduced liquid forms a “perfect parabolic shape,” which the polymer then grows upon to form the mirror’s base. As Space.com notes, “a reflective metal layer is applied to the top via evaporation and the liquid is washed away.”

“Utilizing this basic physics phenomenon, we deposited a polymer onto this perfect optical surface, which formed a parabolic thin membrane that can be used as the primary mirror of a telescope once coated with a reflecting surface such as aluminum,” explained Rabien in the announcement. 

At this stage, although the material in the study could be easily folded or rolled up to pack away for delivery to space, that optimal parabolic shape would be “nearly impossible” to reform. To solve this issue, researchers developed a new thermal method utilizing localized, light-derived temperature changes to gain an adaptive shape control which could bring the membrane back into its necessary optical shape.

[Related: NASA reveals James Webb Space Telescope first finds.]

In addition to its telescopic applications, the new mirror membranes could be used for adaptive optic systems. These systems rely upon deformable mirrors to compensate for incoming light distortion. Given the new material’s extreme malleability, the mirrors could be shaped via electrostatic actuators in a way that is less expensive than existing methods.

Looking ahead, Rabien’s team hopes to conduct further experiments to improve the membrane’s malleability, as well as improve how much initial distortion it can handle. There are also plans for even larger final products—a goal that could be integral to getting the new advancement into space.

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On Earth, we’ve decided that some places are worth saving. Whether it’s the pyramids of Giza or the battlefield lands at Gettsyburg, sites that epitomize our cultural heritage are safeguarded by legal frameworks. 

But human history extends beyond our planet. In 1969, astronaut Neil Armstrong became the first human to walk on the moon and left behind that first footprint. Some view it as comparable to any archeological site on Earth—without the same protections. Undisturbed, the footprint could last for a million years. But a revived interest in the moon means the lunar surface is about to be busier than ever. No law specifically defends the footprint or sites like it from being run over by a lunar rover or astronauts on a joyride. 

“Just in this year alone, we have four or five missions planned,” says Michelle Hanlon, a space lawyer and co-founder of the nonprofit For All Moonkind. “Not just from nations, but from private companies.” While some upcoming lunar expeditions will be flybys, others will actually land on the moon. 

In some ways, it’s a race against the clock—and Hanlon is making moves. On March 27, while attending a meeting of the legal subcommittee of the United Nations Committee on the Peaceful Uses of Outer Space (COPUOS), she announced the creation of the For All Moonkind Institute on Space Law and Ethics. This new nonprofit organization will go beyond advocating for protecting off-world heritage sites and contemplate the ethics around some activities in space that are not fully covered in existing international law.  

There is some precedent to lunar law. The Outer Space Treaty of 1967 governs activities in outer space and sets important boundaries: Anything but peaceful use of the moon is prohibited, and nations are not allowed to claim territory on the satellite or any celestial body.

The Outer Space treaty is also quite vague, according to Christopher Johnson, a space lawyer with the Secure World Foundation, a nonprofit dedicated to space sustainability. You can use resources in space but not appropriate them. In addition, you must give other nations and companies “due regard” and avoid “harmful contamination” of the extraterrestrial environment. 

However, these general principles have never been applied to solving practical problems. “We are realizing that we just have a couple of broad dictums,” Johnson says. “You know, be nice to your neighbor, observe the golden rule, show people a little bit of respect.”

[Related: Say hello to the Commerce Department’s new space traffic-cop program]

Because these rules have not really been tested, Johnson says we can’t be sure people will follow them. The experiment is about to begin: India and Russia plan to launch their unscrewed Chandrayaan 3 and Luna 25 missions to the lunar surface this summer, for instance, while Japanese company iSpace hopes to place a lander on the lunar surface in late April. SpaceX aims to ferry a billionaire customer around the moon in a Starship vehicle by year’s end.

It was with an eye on increasing human activity on and around the moon that Hanlon co-founded For All Moonkind in 2017, an all-volunteer organization dedicated to lobbying for legal protections for areas of cultural heritage on the moon and elsewhere in space. That includes the Apollo program landing sites and the lunar landers left behind by the Soviet Union. These protections could eventually extend to natural wonders like Olympus Mons, the largest volcano on Mars and in the solar system.

Together with For All Moonkind, the Secure World Foundation produced a Lunar Policy Handbook, which they distributed at the United Nations in Vienna during the For All Moonkind Institute announcement at the end of March. Both For All Moonkind and the Secure World Foundation are official observer organizations at COPUOS and are allowed to sit in on meetings. 

The new institute and the handbook represent a modern interest among policymakers, space lawyers, and private companies to create clearer rules of the road for how humans will actually behave on the moon when there are multiple parties present around the same time. These are issues Johnson says policymakers need to be wary of and that they should think through the precedents that could be set by actions that are not necessarily against international law but might not be a good idea.

“This is why we created the Institute on Space Law and Ethics because there are people who want to know what it means to be responsible,” Hanlon says. “The problem is we don’t have a blueprint for that.”

Johnson points to the 2019 crash landing of the Israeli Beresheet lunar lander as an example, where unknown to the other parties of the mission, the nonprofit Arch Mission Foundation had included freeze-dried tardigrades, also known as water bears, in the payload. Tardigrades are hardy and known to be able to survive in the vacuum of space, so their spilling onto the lunar surface could present a form of biological contamination, although some follow-up research suggests the microscopic creatures did not survive the violent impact. 

“Smuggling tardigrades to the moon doesn’t seem to clearly violate any international law that I can point to,” Johnson says. “The ethical component steps in to fill a gap about the law to say, ‘Well, is it a good idea?’” 

[Related: Want to learn about something in space? Crash into it.]

Protecting cultural heritage sites like the Apollo landing sites, on the other hand, could actually be interpreted as violating the probation on claiming territory in space, according to Hanlon. That’s why For All Mankind is involved in discussions around the ethics of lunar activity generally, she says.  The hope is that—if the world’s nations can agree that there’s significant, shared cultural heritage on the moon—the aftereffect could be better relations between major players in the current space race. 

“The ultimate goal is a new treaty, not an amendment to the Outer Space Treaty, that recognizes cultural heritage beyond Earth,” Hanlon explains. “It’s going to be a long time, especially now with the Russian invasion of Ukraine, for us to all agree on something here at the UN. But we think it can start with that heritage, that kinship that way.”

Or as US President Lyndon Johnson put it when signing the Outer Space Treaty, we “will meet someday on the surface of the moon as brothers and not as warriors.”

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In a sequel to its image of the planet Neptune’s rings in September 2022, the James Webb Space Telescope (JWST) has taken a new image of the ice giant Uranus. The new view of the seventh planet from the sun was taken on February 6 and released to the public on April 6. It shows off Uranus’ rings and some of the bright features in its atmosphere.

[Related: Expect NASA to probe Uranus within the next 10 years.]

The image was taken with NIRCam as a short 12-minute exposure and combines data from two filters, one shown in blue and one in orange. Uranus typically displays a blue hue naturally. 

Of the planet’s 13 known rings, 11 are visible in the image. According to NASA, some of these rings are so bright that they appear to merge into a larger ring when close together while observed with JWST. Nine are classed as the main rings of the planet, and two are the fainter dusty rings. These dusty rings have only ever been imaged by the Voyager 2 spacecraft as it flew past the planet in 1986 and with the Keck Observatory’s advanced adaptive optics in the early 2000s. Scientists expect that future images will also reveal the two even more faint outer rings that the Hubble Space Telescope discovered in 2007.

The new image also captured many of Uranus’ 27 known moons. Many of the moons are too small and faint to be seen in this image, but six can be seen in the wide-view. Uranus is categorized as an ice giant due to the chemical make-up of its interior. The majority of Uranus’ mass is believed to be a hot, dense, fluid of water, methane, and ammonia above a small and rocky core.

Among the planets in our solar system, Uranus has a unique rotation. It rotates on its side at a roughly 90-degree angle, which causes extreme seasons. The planet’s poles experience multiple years of constant sunlight, and then an equal number of years in total darkness. It takes the planet 84 years to orbit the sun and its northern pole is currently in its late spring. Uranus’ next northern summer isn’t until 2028. 

[Related: Uranus’s quirks and hidden features have astronomers jazzed about a direct mission.]

Uranus also has a unique polar cap on the right side of the planet. It’s visible as a brightening at the pole facing the sun, and seems to appear when the pole enters direct sunlight during the summer and vanishes in the autumn. JWST’s data is expected to help scientists understand what’s behind this mechanism and has already noticed a subtle brightening at the cap’s center. NASA believes that JWST’s Near-Infrared Camera NIRCam’s sensitivity to longer wavelengths may be why they can see this enhanced Uranus polar feature, since it has not been seen as clearly with other powerful telescopes.

Additionally, a bright cloud lies at the edge of the polar cap and another can be seen on the planet’s left limb. The JWST team believes that these clouds are likely connected to storm activity. 

More imaging and additional studies of the planet are currently in the works by multiple space agencies, after the National Academies of Sciences, Engineering, and Medicine identified Uranus science as a priority in its 2023-2033 Planetary Science and Astrobiology decadal survey. This 10 year-long study will likely include a study of Saturn’s moons and sending a probe to Uranus. 

“Sending a flagship to Uranus makes a lot of sense,” because Uranus and Neptune “are fairly unexplored worlds,” Mark Marley, a planetary scientist at the University of Arizona and director of the Lunar and Planetary Laboratory, told PopSci last year. Marley also called the future study it “clear-eyed,” and said that learning more about Uranus will help scientists understand both the formation of our solar system and even some exoplanets. 

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Last November, a group of physicists claimed they’d simulated a wormhole for the first time inside Google’s Sycamore quantum computer. The researchers tossed information into one batch of simulated particles and said they watched that information emerge in a second, separated batch of circuits. 

It was a bold claim. Wormholes—tunnels through space-time—are a very theoretical product of gravity that Albert Einstein helped popularize. It would be a remarkable feat to create even a wormhole facsimile with quantum mechanics, an entirely different branch of physics that has long been at odds with gravity. 

And indeed, three months later, a different group of physicists argued that the results could be explained through alternative, more mundane means. In response, the team behind the Sycamore project doubled down on their results.

Their case highlights a tantalizing dilemma. Successfully simulating a wormhole in a quantum computer could be a boon for solving an old physics conundrum, but so far, quantum hardware hasn’t been powerful or reliable enough to do the complex math. They’re getting there very quickly, though.

[Related: Journey to the center of a quantum computer]

The root of the challenge lies in the difference of mathematical systems. “Classical” computers, such as the device you’re using to read this article, store their data and do their computations with “bits,” typically made from silicon. These bits are binary: They can be either zero or one, nothing else. 

For the vast majority of human tasks, that’s no problem. But binary isn’t ideal for crunching the arcana of quantum mechanics—the bizarre rules that guide the universe at the smallest scales—because the system essentially operates in a completely different form of math.

Enter a quantum computer, which swaps out the silicon bits for “qubits” that adhere to quantum mechanics. A qubit can be zero, one—or, due to quantum trickery, some combination of zero and one. Qubits can make certain calculations far more manageable. In 2019, Google operators used Sycamore’s qubits to complete a task in minutes that they said would have taken a classical computer 10,000 years.

There are several ways of simulating wormholes with equations that a computer can solve. The 2022 paper’s researchers used something called the Sachdev–Ye–Kitaev (SYK) model. A classical computer can crunch the SYK model, but very ineffectively. Not only does the model involve particles interacting at a distance, it also features a good deal of randomness, both of which are tricky for classical computers to process.

Even the wormhole researchers greatly simplified the SYK model for their experiment. “The simulation they did, actually, is very easy to do classically,” says Hrant Gharibyan, a physicist at Caltech, who wasn’t involved in the project. “I can do it in my laptop.”

But simplifying the model opens up new questions. If physicists want to show that they’ve created a wormhole through quantum math, it makes it harder for them to confirm that they’ve actually done it. Furthermore, if physicists want to learn how quantum mechanics interact with gravity, it gives them less information to work with.

Critics have pointed out that the Sycamore experiment didn’t use enough qubits. While the chips in your phone or computer might have billions or trillions of bits, quantum computers are far, far smaller. The wormhole simulation, in particular, used nine.

While the team certainly didn’t need billions of qubits, according to experts, they should have used more than nine. “With a nine-qubit experiment, you’re not going to learn anything whatsoever that you didn’t already know from classically simulating the experiment,” says Scott Aaronson, a computer scientist at the University of Texas at Austin, who wasn’t an author on the paper.

If size is the problem, then current trends give physicists reason to be optimistic that they can simulate a proper wormhole in a quantum computer. Only a decade ago, even getting one qubit to function was an impressive feat. In 2016, the first quantum computer with cloud access had five. Now, quantum computers are in the dozens of qubits. Google Sycamore has a maximum of 53. IBM is planning a line of quantum computers that will surpass 1,000 qubits by the mid-2020s.

Additionally, today’s qubits are extremely fragile. Even small blips of noise or tiny temperature fluctuations—qubits need to be kept at frigid temperatures, just barely above absolute zero—may cause the medium to decohere, snapping the computer out of the quantum world and back into a mundane classical bit. (Newer quantum computers focus on trying to make qubits “cleaner.”)

Some quantum computers use individual particles; others use atomic nuclei. Google’s Sycamore, meanwhile, uses loops of superconducting wire. It all shows that qubits are in their VHS-versus-Betamax era: There are multiple competitors, and it isn’t clear which qubit—if any—will become the equivalent to the ubiquitous classical silicon chip.

“You need to make bigger quantum computers with cleaner qubits,” says Gharibyan, “and that’s when real quantum computing power will come.”

[Related: Scientists eye lab-grown brains to replace silicon-based computer chips]

For many physicists, that’s when great intangible rewards come in. Quantum physics, which guides the universe at its smallest scales, doesn’t have a complete explanation for gravity, which guides the universe at its largest. Showing a quantum wormhole—with qubits effectively teleporting—could bridge that gap.

So, the Google users aren’t the only physicists poring over this problem. Earlier in 2022, a third group of researchers published a paper, listing signs of teleportation they’d detected in quantum computers. They didn’t send a qubit through a simulated wormhole—they only sent a classical bit—but it was still a promising step. Better quantum gravity experiments, such as simulating the full SYK model, are about “purely extending our ability to build processors,” Gharibyan explains.

Aaronson is skeptical that a wormhole will ever be modeled in a meaningful form, even in the event that quantum computers do reach thousands of qubits. “There’s at least a chance of learning something relevant to quantum gravity that we didn’t know how to calculate otherwise,” he says. “Even then, I’ve struggled to get the experts to tell me what that thing is.”

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After more than 50 years, NASA is going back to the moon. If all goes as planned, the Artemis III mission will see two astronauts stepping foot on the lunar surface sometime in 2025. Subsequent Artemis missions involving the construction of a lunar space station and a permanent base on the lunar south pole could follow every one to two years, funding permitting.

But before the 21st-century moon landing, NASA wants to ensure its astronauts’ ride, the Orion spacecraft, is up to the task. The successful, uncrewed Artemis I put the new Orion space capsule and Space Launch System (SLS) rocket’s propulsion and navigation systems to the test. The recently announced crew of four astronauts for Artemis II, scheduled for November 2024, will take the next leap by giving Orion a full shakedown of its manual flight and life support systems.

“We’ll be the first humans to fly on the spacecraft,” says Artemis II Commander Reid Wiseman. “We need to make sure our vehicle can keep us alive when we go into deep space.”

That makes the Artemis II mission unique, in that its primary focus is not exploration nor science experiments, but technical preparation for the astronauts on subsequent Artemis exploits. “Our focus is on what we can do to enable our co-workers to operate in the lunar environment, whether it’s on the Gateway outpost [a space station NASA plans to build in lunar orbit beginning in 2024] or the lunar surface,” Wiseman says.

To achieve that goal, Wiseman and his crewmates, NASA astronauts Christina Koch and Victor Glover, as well as Canadian astronaut Jeremy Hansen, will kick off their 10-day flight with a series of highly elliptical orbits around the Earth. These rounds are designed to give them about 24 hours to test out their spacecraft and allow for an easy mission abort path to return home if any problems arise.

“That first 24 hours is really going to be intense. Looking at the crew timeline, you can barely fit everything in,” Wisemans says of all the spacecraft testing his team will conduct. “And then when we get finished with all of that, our reward is translunar injection,” the engine firing maneuver that will set the spacecraft on a course out of Earth’s orbit and toward the moon.

[Related: NASA’s uncrewed Orion spacecraft will get a hand from a Star Trek-inspired comms system]

About 40 minutes after launching from the Kennedy Space Center, the upper stage of the SLS rocket known as the Interim Cryogenic Propulsion Stage (ICPS) will boost Orion into an ellipse that will carry the crew about 1,800 miles above the Earth at its highest point, and about 115 miles at its lowest.

After initial checks during that roughly 90-minute first orbit, the ICPS will fire again to boost the spacecraft into a much higher ellipse around the planet, this time reaching as high as 46,000 miles above it—far outstripping the 250-mile altitude where the International Space Station usually flies. This second orbit will take nearly 24 hours and is where the crew will do the most serious assessments on Orion’s systems.

“We’re gonna try to test out every manual capability that we have on Orion: manual maneuvering, manual targeting, manual communications set up,” Wiseman says. In effect, they’ll be simulating what it takes to prepare the capsule for a lunar landing—but in the Earth’s orbit, not the moon’s.

A crucial part of the testing will involve what NASA calls a ”proximity operations demonstration.” Orion and the European-built service module, which carries life support, power, and propulsion systems, will detach from the ICPS as the crew practices manual maneuvering to align their spacecraft with the discarded upper stage of the rocket. While they will not actually dock with the ICPS, they will run the systems that future Artemis crews need to dock with a lunar lander or the Lunar Gateway before journeying to the moon’s surface.  

Next, the crew will conduct support and communications checks to ensure the Orion spacecraft is ready to head into deep space. If given the go-ahead by mission control, they will use the Orion spacecraft’s main engines to conduct a translunar injection burn designed to carry the spacecraft on a looping path around the moon, reaching a peak distance of about 230,000 miles from Earth. It will take about four days just to travel to and from the moon.

Artemis II stands out from the other missions in its series in that the Orion main engine will carry out the translunar injection burn, rather than the ICPS, which will have used up its fuel boosting the capsule into the high elliptical orbit around the Earth for testing. And because Artemis II will not involve landing on the moon, the crew doesn’t have to perform an orbital insertion burn, and will instead simply loop around the moon, ultimately passing around the far side of the satellite at about 6,400 miles altitude, relying on Earth’s gravity to pull the spacecraft home without the need for another engine burn.      

The crew will have plenty of other tests during the long lunar tour to keep them occupied, according to Wiseman. While the exact science packages for the mission have yet to be announced, the astronauts’ bodies will serve as mini laboratories over the course of the flight—and after.

[Related: Artemis I’s solar panels harvested a lot more energy than expected]

“As a human explorer, there’s going to be a load of science on us, like radiation and how we handle the deep space environment,” Wiseman says. “We know a lot about humans operating in space on the International Space Station; we don’t know as much about humans operating in deep space.”

The crew leader says he is honored to be commanding Artemis II, even if that means he may not fly on Artemis III or subsequent missions. “Personally, what I really want to do is I want to go fly Artemis II, I want to come back, and I want to help my crewmates train for their missions,” he explains. “Then I want to be the largest voice in the crowd cheering for them when they get assigned to Artemis III or IV.”

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Warmer global average temperatures from human-made global warming continue to be  one of today’s major climate concerns, but the Earth can also be susceptible to colder and darker periods like our Ice Ages. Even tiny ones. 

During a climate interval scientists call the Little Ice Age (from the early 14th century to the mid-19th century CE), mountain glaciers expanded and the global average temperatures in the Northern Hemisphere dropped by 1.1 °F relative to the average temperatures from 1000 and 2000 CE. Crops failed, sunlight dwindled, and 1816 is often called  “The Year Without a Summer.”

Scientists are still piecing together what may have triggered the Little Ice Age, which are likely some of recorded-history’s largest volcanic eruptions. A study published April 5 in the journal Nature uses an unlikely source to help put this climate puzzle together: night sky observations made by medieval monks. 

[Related: Geologists: We’re not ready for volcanoes.]

An international team of researchers used these 12th and 13th century records from Europe and the Middle East, and data from tree rings and ice cores to accurately date some of the biggest volcanic eruptions that humanity has seen. 

Over a period of almost five years, the team examined hundreds of records looking for references to total lunar eclipses and their coloration. Typically during a lunar eclipse, the moon remains visible as a reddish sphere since it is still covered in sunlight that has been bent around the Earth by our atmosphere. However, after a big volcanic eruption on Earth, there can be so much dust in the stratosphere, that the eclipsed moon almost completely disappears.

Meticulous record keepers during the Medieval period described everything from the major deeds of popes and kings, important battles, natural disasters, and celestial events. Some believed that the goings on in the sky may foretell calamities back on earth. Medieval monks were ever mindful of the bible’s Book of Revelation, which paints a picture of the end times that includes a blood-red moon. Between 1100 and 1300, 64 total lunar eclipses occurred in Europe and the chroniclers observed in this study faithfully documented 51 of them. In five of these eclipses, they also noted that the moon was exceptionally dark.

“I was listening to Pink Floyd’s “Dark Side of the Moon” album when I realized that the darkest lunar eclipses all occurred within a year or so of major volcanic eruptions,” Sébastien Guillet, a paleoclimatologist and physical geographer at the University of Geneva and study co-author said in a statement. “Since we know the exact days of the eclipses, it opened the possibility of using the sightings to narrow down when the eruptions must have happened.”

[Related: Researchers found what they believe is a 2,000-year-old map of the stars.]

Looking at records outside of Europe and the Middle East, the team found that chroniclers in Japan also noted lunar eclipses. A well-known scribe and poet named Fujiwara no Teika described an unprecedented dark eclipse observed on December 2, 1229. He wrote “the old folk had never seen it like this time, with the location of the disk of the Moon not visible, just as if it had disappeared during the eclipse… It was truly something to fear.”

The stratospheric dust in these “unprecedented” eclipses not only obscured the moon, but they cooled summer temperatures by limiting the amount of sunlight that reaches Earth’s surface.  

“We know from previous work that strong tropical eruptions can induce global cooling on the order of roughly 1°C [2.0°F] over a few years,” study co-author and geoscientist and climatologist at the University of Geneva Markus Stoffel said in a statement.  “They can also lead to rainfall anomalies with droughts in one place and floods in another.” Stoffel is a specialist in converting measurements of tree rings into climate data and co-designed the study.

At the time, it would have been difficult or impossible for scientists and laypeople to connect that the poor harvests from the lack of sunlight had anything to do with volcanic eruptions.

“We only knew about these eruptions because they left traces in the ice of Antarctica and Greenland,” study co-author and University of Cambridge volcanologist Clive Oppenheimer said in a statement. “By putting together the information from ice cores and the descriptions from medieval texts we can now make better estimates of when and where some of the biggest eruptions of this period occurred.”

The team worked with climate modelers to compute the likely timing of these eruptions, since the season that the volcanoes erupted in influences how the volcanic dust spread. The modeling helped narrow down the timing and intensity of the volcanic events. 

According to the team, the time interval from 1100 to 1300 is already known to be a particularly active period in volcanic history thanks to evidence from ice cores. Knowing more about this period is crucial to understanding how volcanoes affect society and the planet.

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Virgin Orbit, the private satellite launch company founded in 2017 by multibillionaire Richard Branson, filed for bankruptcy on Tuesday. The news follows the spacefaring venture’s announcement last Friday that it was terminating 675 employees, or roughly 85 percent of its total workforce.

The bankruptcy filing arrives nearly four months after the company’s disastrous, highly publicized orbital launch attempt from Spaceport Cornwall in southwest England. Meant to be the first of many similar missions from within the UK, Virgin Orbit’s unique satellite delivery system ultimately encountered a “devastating launch failure,” losing its entire nine satellite payload.

[Related: A historic first satellite launch in the UK has failed.]

Unlike would-be competitors at SpaceX and Blue Origin, Branson’s Virgin Orbit eschewed more traditional vertical rocketry in favor of a single rocket attached to the underside of a modified Boeing 747 jet. Once the plane’s human crew flew to a sufficient altitude, said rocket would detach, ignite its own engines, and cruise into low-Earth orbit to deliver its cargo as the 747 landed. While January’s “Start Me Up” mission rocket failed in its objectives, the human crew returned safely to Earth.

It’s unclear what will ultimately become of the branch within Branson’s Virgin Galactic enterprise, which listed $243 million in assets and $153 million in debts for its bankruptcy filing. As The New York Times notes, Virgin Orbit’s unique, relatively low-cost, and flexible launch system technology could still appeal to governments, including the US.

[Related: Why the Virgin Galactic spaceship didn’t reach orbit last weekend.]

Despite the setbacks, Virgin Orbit CEO Dan Hart said in a statement on Tuesday that “the team at Virgin Orbit has developed and brought into operation a new and innovative method of launching satellites into orbit, introducing new technology and managing great challenges and great risks along.” He added that the company had launched 33 satellites into “precise orbit” since first staring operations. Until January, four of the company’s five previous mission launches from the Mojave Desert in California were deemed successes.

Although Virgin Orbit officials vowed to push forward with future scheduled plans, industry analysts warned that the company’s future looked bleak. According to Virgin Orbit’s website, its most recent public press announcement came in February in the form of an update regarding its “UK mission anomaly.”

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It might feel like there’s always a new space event every few weeks—and a telescope can help you make the most of the experience. Viewing the planets doesn’t require too much work, but the optical power of a good telescope can allow you to get a much better picture of the galaxy. Here are our recommendations for the best telescopes to suit a range of needs:

• Best tabletop: Sky-Watcher Classic Dobsonian 8-Inch
• Best for beginners: Orion SkyQuest XT6 Classic Dobsonian Telescope Kit
• Best for travel: Celestron NexStar 130
• Best budget: Celestron FirstScope Telescope and FirstScope Accessory Kit

How we chose the best telescopes

To compile our recommendations for the best telescopes, we first reached out to experts. According to Bart Fried, executive vice president of the Amateur Astronomers Association of New York, you don’t need a pair of binoculars or a telescope to view Mercury, Venus, Mars, Jupiter, and Saturn in the sky.

“The ones that were known to the ancients are visible naked eye,” Fried says. “So if they know where to look, they can watch the planets and see them move in relation to the background stars over time.”

But to see more detailed images of the planets, such as Saturn’s rings or Jupiter’s moons, you’ll want to use a telescope. For amateur astronomers, experts recommend using a Dobsonian telescope. 

“They come in many different sizes, are very simple to set up and use, and give you great views of planets, galaxies, and nebulae,” says Jeffrey Miller, an astronomer at St. Lawrence University in Canton, New York.

The best telescopes: Reviews & Recommendations

Best tabletop: Sky-Watcher Classic Dobsonian 8-Inch

SEE IT

This telescope model comes with a two-inch focuser and 1.25-inch adapter that allows viewers to choose between either eyepiece size. The four-arm secondary mirror bracket helps cut down on light loss and diffraction spikes. Plus, this model includes a 9×50 finderscope and a tension control handle.

Best for beginners: Orion SkyQuest XT6 Classic Dobsonian Telescope Kit

SEE IT

This portable telescope pick offers a stable mount, a 1.25-inch 25mm eyepiece, and a red dot sight to help accurately view the planets. The telescope comes with a stargazer guide and moon map for amateurs to easily make new discoveries.

Best for travel: Celestron NexStar 130

SEE IT

For an expansive view of the cosmos, this computerized telescope pick features a Newtonian reflector optical design with a 130mm-aperture that lets you see the clouds around Jupiter and the surface of the moon in great detail. This model also comes with a database that allows you to track 40,000 galaxies, stars, and more; is WiFi-compatible, and comes with interactive sky-simulation software. Yet it’s still compact enough to easily pack on family trips.

Best budget: Celestron FirstScope Telescope and FirstScope Accessory Kit

SEE IT

The Celestron FirstScope Telescope’s 12.5-millimeter eyepiece helps increase magnification to 24 times while the six-millimeter eyepiece offers a magnification of 50 times, allowing you to observe the planets’ features. The 5×24 finderscope helps you locate your favorite celestial bodies. Best of all, it’s easy to transport, so you can explore wherever you are.

Things to consider when selecting the best telescope for you

There are plenty of telescopes to choose from, but there are a few things to consider when picking the right one for you.

Magnification

To see details on the planets, Princeton University professor of astrophysical sciences Gaspar Bakos recommends a device with fairly high magnification. According to Bakos, magnification of 30- to 40-times will help you see things like Jupiter’s moons and Saturn’s rings. To see a phenomenon like Mars’ ice caps, you’ll need a magnification of around 100.

Lens

For Miller, a telescope’s most important feature is the diameter of its primary mirror or lens. He says that the telescope should have as large a mirror or lens as fits your budget and is still easy to move. 

The minimum aperture Fried recommends is a three-inch refractor or a four-inch reflector. 

“A good overall starter telescope would be a six-inch reflector on what’s called a Dobsonian mount,” Fried says. “Another really good sort of classic starter would be a three- to four-inch refractor and for the refractor, I would probably recommend a manual equatorial mount.”

Portability

You don’t need a massive telescope to see your favorite planets. Both Miller and Fried agree that a smaller telescope that’s easier to transport is going to serve you better. 

“If you’re a beginner, you want a telescope that is portable enough that you will take it out — it’s not going to sit in a closet because it’s too heavy or it’s too big, and you can’t get it in a car,” Fried says.

Ease of use

Nowadays, telescopes can have tons of extra features, from electrical hookups to computerized controls. But, these can make the telescopes more expensive and difficult to use. Plus, using a fancy electronic telescope that finds planets for you may take away from the experience.

“On one hand, they’re highly practical, right, because you will actually find things,” Bakos says. “On the other hand, you don’t learn as much as doing it the hard way.”

Final thoughts

• Best tabletop: Sky-Watcher Classic Dobsonian 8-Inch
• Best for beginners: Orion SkyQuest XT6 Classic Dobsonian Telescope Kit
• Best budget: Celestron FirstScope Telescope and FirstScope Accessory Kit
• Best for travel: Celestron NexStar 130

If you’re interested in seeing the planets up close, one of the best telescopes will greatly improve the experience. There are options for beginners and experienced stargazers alike from our recommendations.

Why trust us

Popular Science started writing about technology more than 150 years ago. There was no such thing as “gadget writing” when we published our first issue in 1872, but if there was, our mission to demystify the world of innovation for everyday readers means we would have been all over it. Here in the present, PopSci is fully committed to helping readers navigate the increasingly intimidating array of devices on the market right now.

Our writers and editors have combined decades of experience covering and reviewing consumer electronics. We each have our own obsessive specialties—from high-end audio to video games to cameras and beyond—but when we’re reviewing devices outside of our immediate wheelhouses, we do our best to seek out trustworthy voices and opinions to help guide people to the very best recommendations. We know we don’t know everything, but we’re excited to live through the analysis paralysis that internet shopping can spur so readers don’t have to.

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Astronomers recently detected an explosion so large they dubbed it the BOAT—the brightest of all time. This explosion—known now as GRB 221009A—was a gamma-ray burst (GRB), a flash of extremely high-energy light that resulted from the death of a colossal star.

This detonation is the brightest burst at X-ray and gamma-ray energies since human civilization began. It is 70 times brighter than any observed before. Papers describing this result and others related to the burst were published in a focus issue of The Astrophysical Journal Letters in March.

“A burst this bright arrives at Earth only once every 10,000 years,” says Eric Burns, a Louisiana State assistant professor and astronomer involved in the detection. 

[Related: Black hole collisions could possibly send waves cresting through space-time]

So-called long GRBs—gamma-ray bursts that last longer than two seconds—materialize when a massive star runs out of fuel and collapses into a black hole. This catastrophic collapse causes powerful jets of material to stream out, collide with gas around the former star, and produce high-energy gamma rays. We can see this explosion from Earth if the jet is pointed directly at our planet. 

Astronomers are constantly monitoring the sky for GRBs and other bright, short-lived bursts of light—and that’s how they found the BOAT. The research team that works with NASA’s Neil Gehrels Swift Observatory, is notified each time a certain camera, known as the Burst Alert Telescope (BAT), spots a new GRB.

“This one was bright enough to trigger BAT twice,” says Maia Williams, a Penn State astronomer and lead author of one of the GRB 221009A papers. 

The initial detection of the burst was based on data gathered from the Ultraviolet/Optical Telescope onboard SWIFT and NASA’s Fermi Gamma-ray Space Telescope. After “it was seen by instruments on more than two dozen satellites,” explains Burns. These include the NICER x-ray telescope on the International Space Station, NASA’s NuSTAR x-ray telescope, NASA’s new Imaging X-ray Polarimetry Explorer (IXPE) satellite, and even one of the Voyager spacecraft.

With this vast trove of information on the BOAT, astronomers realized it was a “more-complicated-than-usual GRB,” says Huei Sears, a Northwestern University astronomer and graduate student not involved in the discovery.

Why was the BOAT so bright? First, it’s nearby (in cosmic terms, about 1.9 billion light-years away), which adds to its extreme shine—just like a light bulb appears brighter to your eyes closer up than across a room. But its brightness isn’t just a quirk of its proximity. It’s also “intrinsically the most energetic burst ever seen,” says Burns. 

Astronomers suspect the jets blasted out of the black hole that created the BOAT were narrower  than usual. Imagine the jet setting on a garden hose—and by lucky coincidence this particular hose was aimed directly at Earth. However, why these jets behaved like this is not understood. 

“Scientifically, the BOAT has proven most of our existing models for these events to be incomplete,” says Burns.

[Related: Astronomers now know how supermassive black holes blast us with energy]

Gamma-ray bursts are at their brightest in their first moments but continue with an afterglow for much longer—possibly several years in the case of the BOAT. Williams and her team plan to continue observing the BOAT once a week with SWIFT as long as they can. They’ll also use NASA’s powerhouse James Webb and Hubble space telescopes to get a look at other wavelengths, capturing as much as they can from this rare happening.

“The BOAT is so important because it is one of those events that breaks what we know,” says Sarah Dalessi, a University of Alabama astrophysicist and graduate student involved in the detection. “This is truly a once-in-a-lifetime event.”

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Years after Apollo 17 commander Eugene Cernan returned from NASA’s last crewed mission to the moon, he still felt the massive weight of the milestone. “I realize that other people look at me differently than I look at myself, for I am one of only 12 human beings to have stood on the moon,” he wrote in his autobiography. “I have come to accept that and the enormous responsibility it carries, but as for finding a suitable encore, nothing has ever come close.”

Cernan, who died in 2017, and his crewmates will soon be joined in their lonely chapter of history by four new astronauts, bringing the grand total of people who’ve flown to the moon to 28. Today, NASA and the Canadian Space Agency announced the crew for Artemis II, the first mission to take humans beyond low-Earth orbit since Apollo 17 in 1972. The 10-day mission will take the team on a gravity-assisted trip around the moon and back.

The big reveal occurred at Johnson Space Center in Houston, Texas, in front of an audience of NASA partners, politicians, local students, international astronauts, and Apollo alums. NASA Director of Flight Operations Norman Knight, NASA Chief Astronaut Joe Acaba, and Johnson Space Center Director Vanessa White selected the crew. They were joined on stage during the announcement by NASA Administrator Bill Nelson and Canada’s Minister of Innovation, Science, and Industry Francois-Philippe Champagne. 

“You are the Artemis generation,” Knight said after revealing the final lineup. “We are the Artemis generation.” These are the four American and Canadian astronauts representing humanity in the next lunar launch.

Christina Koch – Mission Specialist, NASA

Koch has completed three missions to the International Space Station (ISS) and set the record for the longest spaceflight for a female astronaut in 2020. Before that, the Michigan native conducted research at the South Pole and tinkered on instruments at the Goddard Flight Space Center. She will be the only professional engineer on the Artemis II crew. “I know who mission control will be calling when it’s time to fix something on board,” Knight joked during her introduction.

Koch relayed her anticipation of riding NASA’s Space Launch System (SLS) on a lunar flyby and back to those watching from home: “It will be a four-day journey [around the moon], testing every aspect of Orion, going to the far side of the moon, and splashing down in the Atlantic. So, am I excited? Absolutely. But one thing I’m excited about is that we’re going to be carrying your excitement, your dreams, and your aspirations on your mission.”

[Related: ‘Phantom’ mannequins will help us understand how cosmic radiation affects female bodies in space]

After the Artemis II mission, Koch will officially be the first woman to travel beyond Earth’s orbit. Koch and her team will circle the moon for 6,400 miles before returning home.

Jeremy Hansen – Mission Specialist, Canada

Hansen’s training experience has brought him to the ocean floor off Key Largo, Florida, the rocky caves of Sardinia, Italy, and the frigid atmosphere above the Arctic Circle. The Canadian fighter pilot led ISS communications from mission control in 2011, but this will mark his first time in space. Hansen is also the only Canadian who’s ever flown on a lunar mission.

“It’s not lost on any of us that the US could go back to the moon by themselves. Canada is grateful for that global mindset and leadership,” he said during the press conference. He also highlighted Canada’s can-do attitude in science and technology: “All of those have added up to this step where a Canadian is going to the moon with an international partnership. Let’s go.”

Victor Glover – Pilot, NASA

Glover is a seasoned pilot both on and off Earth. Hailing from California, he’s steered or ridden more than 40 different types of craft, including the SpaceX Crew Dragon Capsule in 2020 during the first commercial space flight ever to the ISS. His outsized leadership presence in his astronaut class was mentioned multiple times during the event. “In the last few years, he has become a mentor to me,” Artemis II commander Reid Wiseman said.

[Related on PopSci+: Victor J. Glover on the cosmic ‘relay race’ of the new lunar missions]

In his speech, Glover looked into the lofty future of human spaceflight. “Artemis II is more than a mission to the moon and back,” he said. “It’s the next step on the journey that gets humanity to Mars. We have a lot of work to do to get there, and we understand that.” Glover will be the first Black astronaut to travel to the moon.

G. Reid Wiseman – Commander, NASA

Wiseman got a lot done in his single foray into space. During a 2014 ISS expedition, he contributed to upwards of 300 scientific experiments and conducted two lengthy spacewalks. The Maryland native served as NASA’s chief astronaut from 2020 to 2022 and led diplomatic efforts with Roscosmos, Russia’s space agency. 

“This was always you,” Knight said while talking about Wiseman’s decorated military background. “It’s what you were meant to be.”

Flight commanders are largely responsible for safety during space missions. As the first astronauts to travel on the SLS rocket and Orion spacecraft, the Artemis II crew will test the longevity and stability of NASA and SpaceX’s new flight technology as they exit Earth’s atmosphere, slingshot into the moon’s gravitational field, circumnavigate it, and attempt a safe reentry. Wiseman will be in charge of all that with the support of his three fellow astronauts and guidance from mission control.

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This article originally appeared in Knowable Magazine.

It’s evening at the northern tip of the Red Sea, in the Gulf of Aqaba, and Tom Shlesinger readies to take a dive. During the day, the seafloor is full of life and color; at night it looks much more alien. Shlesinger is waiting for a phenomenon that occurs once a year for a plethora of coral species, often several nights after the full moon.

Guided by a flashlight, he spots it: coral releasing a colorful bundle of eggs and sperm, tightly packed together. “You’re looking at it and it starts to flow to the surface,” Shlesinger says. “Then you raise your head, and you turn around, and you realize: All the colonies from the same species are doing it just now.”

Some coral species release bundles of a pinkish- purplish color, others release ones that are yellow, green, white or various other hues. “It’s quite a nice, aesthetic sensation,” says Shlesinger, a marine ecologist at Tel Aviv University and the Interuniversity Institute for Marine Sciences in Eilat, Israel, who has witnessed the show during many years of diving. Corals usually spawn in the evening and night within a tight time window of 10 minutes to half an hour. “The timing is so precise, you can set your clock by the time it happens,” Shlesinger says.

Moon-controlled rhythms in marine critters have been observed for centuries. There is calculated guesswork, for example, that in 1492 Christopher Columbus encountered a kind of glowing marine worm engaged in a lunar-timed mating dance, like the “flame of a small candle alternately raised and lowered.” Diverse animals such as sea mussels, corals, polychaete worms and certain fishes are thought to synchronize their reproductive behavior by the moon. The crucial reason is that such animals — for example, over a hundred coral species at the Great Barrier Reef — release their eggs before fertilization takes place, and synchronization maximizes the probability of an encounter between eggs and sperm.

How does it work? That has long been a mystery, but researchers are getting closer to understanding. They have known for at least 15 years that corals, like many other species, contain light-sensitive proteins called cryptochromes, and have recently reported that in the stony coral, Dipsastraea speciosa, a period of darkness between sunset and moonrise appears key for triggering spawning some days later.

Now, with the help of the marine bristle worm Platynereis dumerilii, researchers have begun to tease out the molecular mechanism by which myriad sea species may pay attention to the cycle of the moon.

The bristle worm originally comes from the Bay of Naples but has been reared in laboratories since the 1950s. It is particularly well-suited for such studies, says Kristin Tessmar-Raible, a chronobiologist at the University of Vienna. During its reproductive season, it spawns for a few days after the full moon: The adult worms rise en masse to the water surface at a dark hour, engage in a nuptial dance and release their gametes. After reproduction, the worms burst and die.

The tools the creatures need for such precision timing — down to days of the month, and then down to hours of the day — are akin to what we’d need to arrange a meeting, says Tessmar-Raible. “We integrate different types of timing systems: a watch, a calendar,” she says. In the worm’s case, the requisite timing systems are a daily — or circadian — clock along with another, circalunar clock for its monthly reckoning.

To explore the worm’s timing, Tessmar-Raible’s group began experiments on genes in the worm that carry instructions for making cryptochromes. The group focused specifically on a cryptochrome in bristle worms called L-Cry. To figure out its involvement in synchronized spawning, they used genetic tricks to inactivate the l-cry gene and observe what happened to the worm’s lunar clock. They also carried out experiments to analyze the L-Cry protein.

Though the story is far from complete, the scientists have evidence that the protein plays a key role in something very important: distinguishing sunlight from moonlight. L-Cry is, in effect, “a natural light interpreter,” Tessmar-Raible and coauthors write in a 2023 overview of rhythms in marine creatures in the Annual Review of Marine Science.

The role is a crucial one, because in order to synchronize and spawn on the same night, the creatures need to be able to stay in step with the patterns of the moon on its roughly 29.5-day cycle — from full moon, when the moonlight is bright and lasts all night long, to the dimmer, shorter-duration illuminations as the moon waxes and wanes.

When L-Cry was absent, the scientists found, the worms didn’t discriminate appropriately. The animals synchronized tightly to artificial lunar cycles of light and dark inside the lab — ones in which the “sunlight” was dimmer than the real sun and the “moonlight” was brighter than the real moon. In other words, worms without L-Cry latched onto unrealistic light cycles. In contrast, the normal worms that still made L-Cry protein were more discerning and did a better job of synchronizing their lunar clocks correctly when the nighttime lighting more closely matched that of the bristle worm’s natural environment.

The researchers accrued other evidence, too, that L-Cry is an important player in lunar timekeeping, helping to discern sunlight from moonlight. They purified the L-Cry protein and found that it consists of two protein strands bound together, with each half holding a light-absorbing structure known as a flavin. The sensitivity of each flavin to light is very different. Because of this, the L-Cry can respond to both strong light akin to sunlight and dim light equivalent to moonlight — light over five orders of magnitude of intensity — but with very different consequences.

After four hours of dim “moonlight” exposure, for example, light-induced chemical reactions in the protein — photoreduction — occurred, reaching a maximum after six hours of continuous “moonlight” exposure. Six hours is significant, the scientists note, because the worm would only encounter six hours’ worth of moonlight at times when the moon was full. This therefore would allow the creature to synchronize with monthly lunar cycles and pick the right night on which to spawn. “I find it very exciting that we could describe a protein that can measure moon phases,” says Eva Wolf, a structural biologist at IMB Mainz and Johannes Gutenberg University Mainz, and a collaborator with Tessmar-Raible on the work.

How does the worm know that it’s sensing moonlight, though, and not sunlight? Under moonlight conditions, only one of the two flavins was photoreduced, the scientists found. In bright light, by contrast, both flavin molecules were photoreduced, and very quickly. Furthermore, these two types of L-Cry ended up in different parts of the worm’s cells: the fully photoreduced protein in the cytoplasm, where it was quickly destroyed, and the partly photoreduced L-Cry proteins in the nucleus.

All in all, the situation is akin to having “a highly sensitive ‘low light sensor’ for moonlight detection with a much less sensitive ‘high light sensor’ for sunlight detection,” the authors conclude in a report published in 2022.

Many puzzles remain, of course. For example, though presumably the two distinct fates of the L-Cry molecules transmit different biological signals inside the worm, researchers don’t yet know what they are. And though the L-Cry protein is key for discriminating sunlight from moonlight, other light-sensing molecules must be involved, the scientists say.

In a separate study, the researchers used cameras in the lab to record the burst of swimming activity (the worm’s “nuptial dance”) that occurs when a worm sets out to spawn, and followed it up with genetic experiments. And they confirmed that another molecule is key for the worm to spawn during the right one- to two-hour window — the dark portion of that night between sunset and moonrise — on the designated spawning nights.

Called r-Opsin, the molecule is extremely sensitive to light, the scientists found — about a hundred times more than the melanopsin found in the average human eye. It modifies the worm’s daily clock by acting as a moonrise sensor, the researchers propose (the moon rises successively later each night). The notion is that combining the signal from the r-Opsin sensor with the information from the L-Cry on what kind of light it is allows the worm to pick just the right time on the spawning night to rise to the surface and release its gametes.

Resident timekeepers

As biologists tease apart the timekeepers needed to synchronize activities in so many marine creatures, the questions bubble up. Where, exactly, do these timekeepers reside? In species in which biological clocks have been well studied — such as Drosophila and mice — that central timekeeper is housed in the brain. In the marine bristleworm, clocks exist in its forebrain and peripheral tissues of its trunk. But other creatures, such as corals and sea anemones, don’t even have brains. “Is there a population of neurons that acts as a central clock, or is it much more diffuse? We don’t really know,” says Ann Tarrant, a marine biologist at the Woods Hole Oceanographic Institution who is studying chronobiology of the sea anemone Nematostella vectensis.

Scientists are also interested in knowing what roles are played by microbes that might live with marine creatures. Corals like Acropora, for example, often have algae living symbiotically within their cells. “We know that algae like that also have circadian rhythms,” Tarrant says. “So when you have a coral and an alga together, it’s complicated to know how that works.”

Researchers are worried, too, about the fate of spectacular synchronized events like coral spawning in a light-polluted world. If coral clock mechanisms are similar to the bristle worm’s, how would creatures be able to properly detect the natural full moon? In 2021, researchers reported lab studies demonstrating that light pollution can desynchronize spawning in two coral species — Acropora millepora and Acropora digitifera — found in the Indo-Pacific Ocean.

Shlesinger and his colleague Yossi Loya have seen just this in natural populations, in several coral species in the Red Sea. Reporting in 2019, the scientists compared four years’ worth of spawning observations with data from the same site 30 years earlier. Three of the five species they studied showed spawning asynchrony, leading to fewer — or no — instances of new, small corals on the reef.

Along with artificial light, Shlesinger believes there could be other culprits involved, such as endocrine-disrupting chemical pollutants. He’s working to understand that — and to learn why some species remain unaffected.

Based on his underwater observations to date, Shlesinger believes that about 10 of the 50-odd species he has looked at may be asynchronizing in the Red Sea, the northern portion of which is considered a climate-change refuge for corals and has not experienced mass bleaching events. “I suspect,” he says, “that we will hear of more issues like that in other places in the world, and in more species.”

This article originally appeared in Knowable Magazine, an independent journalistic endeavor from Annual Reviews. Sign up for the newsletter.

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Even the most advanced ground-based telescopes struggle with nearsighted vision issues. Often this isn’t through any fault of their own, but a dilemma of having to see through the Earth’s constantly varying atmospheric interferences. As undesirable as that is to the casual viewer, it can dramatically frustrate researchers’ abilities to construct accurate images of the universe—both literally and figuratively. By applying an existing, open-source computer vision AI algorithm to telescope tech, however, researchers have found they are able to hone our cosmic observations.

As detailed in a paper published this month with the Monthly Notices of the Royal Astronomical Society, a team of scientists from Northwestern University and Beijing’s Tsinghua University recently trained an AI on data simulated to match imaging parameters for the soon-to-be opened Vera C. Rubin Observatory in north-central Chile. As Northwestern’s announcement explains, while similar technology already exists, the new algorithm produces blur-free, high resolution glimpses of the universe both faster and more realistically.

“Photography’s goal is often to get a pretty, nice-looking image. But astronomical images are used for science,” said Emma Alexander, an assistant professor of computer science at Northwestern and the study’s senior author. Alexander explained that cleaning up image data correctly helps astronomers obtain far more accurate data. Because the AI algorithm does so computationally, physicists can glean better measurements.

[Related: The most awesome aerospace innovations of 2022.]

The results aren’t just prettier galactic portraits, but more reliable sources of study. For example, analyzing galaxies’ shapes can help determine gravitational effects on some of the universe’s largest bodies. Blurring that image—be it through low-resolution tech or atmospheric interference—makes scientists’ less reliable and accurate. According to the team’s work, the optimized tool generated images with roughly 38 percent less error than compared to classic blur-removal methods, and around 7 percent less error compared to existing modern methods.

What’s more, the team’s AI tool, coding, and tutorial guidelines are already available online for free. Going forward, any interested astronomers can download and utilize the algorithm to improve their own observatories’ telescopes, and thus obtain better and more accurate data.

“Now we pass off this tool, putting it into the hands of astronomy experts,” continued Alexander. “We think this could be a valuable resource for sky surveys to obtain the most realistic data possible.” Until then, astronomy fans can expect far more detailed results from the Rubin Observatory when it officially opens in 2024 to begin its deep survey of the stars.

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Nothing can really stay a secret forever, and this otherworldly mystery has evaded astronomers for four decades. Saturn’s signature ring system is heating the planet’s upper atmosphere. According to NASA, this phenomenon has never been seen in the solar system, and the unexpected interaction between Saturn and its vast rings could provide a tool for predicting if the planets around other stars have ring systems like Saturn’s.

The findings were published March 30 in the Planetary Science Journal.

The evidence that caused Saturn to spill its secrets is an excess of ultraviolet radiation that is seen as a spectral line of hot hydrogen in Saturn’s atmosphere. This bump in radiation indicates that something is heating and contaminating the planet’s upper atmosphere from the outside. 

[Related: Hubble telescope spies Saturn’s rings in ‘spoke season.’]

According to the paper, the most feasible explanation is that icy ring particles raining down onto Saturn’s atmosphere cause this heating. A few things could be driving this shower of particles, including the impact of micrometeorites, bombardments with particles from solar wind, solar ultraviolet radiation, or electromagnetic forces picking up electrically charged dust. Additionally, Saturn’s gravitational field is pulling particles into the planet while this is all occurring.

In 2017, NASA’s Cassini probe plunged into Saturn’s atmosphere and measured the atmospheric constituents, confirming that many particles are indeed falling in from the rings. This new discovery used that Cassini data in addition to observations from NASA’s Hubble Space Telescope, the Voyager 1 and 2 spacecraft, and the retired International Ultraviolet Explorer mission.

“Though the slow disintegration of the rings is well known, its influence on the atomic hydrogen of the planet is a surprise. From the Cassini probe, we already knew about the rings’ influence. However, we knew nothing about the atomic hydrogen content,” astronomer and co-author Lotfi Ben-Jaffel of the Institute of Astrophysics in Paris and the Lunar & Planetary Laboratory, said in a statement. 

“Everything is driven by ring particles cascading into the atmosphere at specific latitudes. They modify the upper atmosphere, changing the composition,” said Ben-Jaffel. “And then you also have collisional processes with atmospheric gasses that are probably heating the atmosphere at a specific altitude.”

To come to this conclusion, Ben-Jaffel pulled together archival ultraviolet-light (UV) observations from four different space missions that studied the ringed planet. During these missions spaced out over 40 years, astronomers dismissed the measurements as noise in the detectors. By 2004, when the Cassini mission arrived on Saturn, it also collected UV data on the atmosphere over a period of several years. Some of the additional secret-cracking data came from Hubble and the International Ultraviolet Explorer, an international collaboration between NASA, the European Space Agency, and the United Kingdom’s Science and Engineering Research Council that launched in 1978.

[Related: The origin of Saturn’s slanted rings may link back to a lost, ancient moon.]

The lingering question among decades of data was whether all of it could be illusory or actually reflect a true phenomenon on Saturn.

The key turned out to be Ben-Jaffel’s decision to use measurements taken by the Hubble’s Space Telescope Imaging Spectrograph (STIS). These precision observations of Saturn helped calibrate the archival UV data from all four of the other space missions that have observed Saturn. He compared the STIS UV observations of Saturn to the distribution of light from multiple space missions and instruments.

“When everything was calibrated, we saw clearly that the spectra are consistent across all the missions. This was possible because we have the same reference point, from Hubble, on the rate of transfer of energy from the atmosphere as measured over decades,” said Ben-Jaffel. “It was really a surprise for me. I just plotted the different light distribution data together, and then I realized, wow—it’s the same.”

Forty years of UV data covers multiple solar cycles and helps astronomers study the sun’s seasonal effects on Saturn. Bringing this data together and calibrating it helped Ben-Jaffel find that there was no difference in the level of UV radiation. The UV level of radiation can be followed at “at any time, any position on the planet,” which points to the steady ice rain coming from Saturn’s rings as the best explanation.

Some of the next goals for this research include seeing how it can be applied to planets that orbit other stars. 

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April is officially Global Astronomy Month, a month-long celebration of all things celestial by Astronomers Without Borders, a US-based club that connects global skywatchers. The event features a Global Star Party and Sun Day and online lessons to highlight the conjunction of art and astronomy. April also happens to be an exciting month for space happenings in general. If you happen to get any stellar sky photos, tag us and include #PopSkyGazers.

[Related: Your guide to the types of stars, from their dusty births to violent deaths.]

April 5 and 6 – Full Pink Moon

The first full moon of spring in the Northern Hemisphere will reach peak illumination at 12:37 AM EDT on April 6. First glimpses of the full Pink Moon will be on April 5, but because it reaches peak illumination so early in Eastern Time, Western time zones will see it peak on the night of April 5.

April’s full moon also goes by many names. The “pink” references early springtime blooms of the wildflower Phlox subulata found in eastern North America. This month’s moon is also the Paschal Full Moon, which determines when the Christian holiday Easter is celebrated. Easter is always celebrated on the first Sunday after the first full moon of spring, so this year Easter will be on Sunday, April 9.

Every year, the April full moon is also called the Frog Moon or Omakakiiwi-giizis in Anishinaabemowin/Ojibwe, the It’s Thundering Moon or Wasakayutese in Oneida, and the Planting Moon or Tahch’atapa in Tunica, the language of the Tunica-Biloxi Tribe of Louisiana.

April 7 – 34P/PANSTARRS comet at its closest point in flyby

The Jupiter-family comet 364P/PANSTARRS will pass within 11 million miles (0.12 AU) of the Earth in early April. The comet will be in the “foxy” constellation Vulpecula and is expected to have a high brightness magnitude of about 12.3. It will be visible in the Northern and Southern hemispheres, but those in Northern latitudes will be able to see it better. 

[Related: A total solar eclipse bathed Antarctica in darkness.]

April 20 – Total solar eclipse

Eclipses are always an exciting event, but this one comes with a twist. A total solar eclipse occurs during a rare cosmic alignment of the Earth, moon, and sun. The next solar eclipse will be the first of its kind since 2013 and the last until 2031.

On April 20, a new moon will eclipse the sun, but it will falter a bit. Since it is slightly too far away from the Earth in its elliptical orbit to fully cover all of the sun, the moon will actually fail to cause a total solar eclipse for a brief moment. A ring of fire will be visible for a few seconds over the Indian Ocean, but the moonshadow will completely cover the sun and cause a total solar eclipse by the time it reaches Western Australia. Eclipse chasers in the town of Exmouth and on ships in the Indian Ocean will likely experience about one minute of darkness during the day.

A long display of Baily’s beads around the New Moon and a view of the sun’s pink chromosphere could also appear around the moon during totality on eclipse day. While this eclipse won’t really be visible in the US, we’re only a few months away from the 2023 annular solar eclipse, which will reach totality in the western part of the country this October. 

April 21, 22, and 23 – Lyrid meteor shower

The Lyrids are predicted to start late in the evening of April 21 or April 22 and last until dawn on April 23. The predicted peak is 9:06 EDT on April 23. While the peak of the Lyrids is narrow, the new moon falls on April 19, so it will not interfere with skygazing. 

Ten to 15 meteors per hour can be seen in a dark sky with no moon. The Lyrids are even known for some rare surges in activity that can sometimes bring them up to 100 per hour. The meteor shower will be visible from both the Northern and Southern hemispheres, but is much more active in the north.

The same skygazing rules that apply to pretty much all space-watching activities are key this month: Go to a dark spot away from the lights of a city or town and let the eyes adjust to the darkness for about a half an hour. 

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GROWING UP in a small Danish town, Carsten Olsen didn’t have much access to information about space. Until the internet came along. Once connected, Olsen started frequenting discussion forums, where real rocket scientists and even astronauts came to chat. He ordered rocketry books on Amazon and became obsessed with reaching toward that great beyond.

He didn’t grow up to become a rocket scientist himself—not professionally. He works at a public school in Copenhagen. But he did join an untamed, dangerous, and optimistic space endeavor: a hobbyist group hoping to build rockets that could, someday, send a volunteer astronaut to the edge of space. They call themselves Copenhagen Suborbitals, or CopSub, and work out of an old shipyard in Denmark’s capital city.

Olsen first heard about CopSub, an amateur human spaceflight endeavor, on the local news. “Something about some crazy guys,” he says. “Space cowboys.”

At the time, he was training for marathons, and he ran by the shipyard on a training route. “I noticed there were a lot of people there gathering together around something,” he says. That something was a rocket engine—firing in place. It looked like a white tube about 18 feet long, lying on its side, bolted to concrete pillars. Other CopSub tests have included a tiny passenger capsule with a crash dummy inside. “I stepped up and said, ‘I need to be part of this,’” Olsen recalls. 

Eventually, the group welcomed him into its ranks, even though he didn’t have any technical skills to speak of. Today, he’s one of CopSub’s approximately 70 volunteers, some of whom work in the space industry professionally and have rocketry or other technical expertise, and some of whom are more like Olsen. While other private spaceflight programs—from Jeff Bezos’ Blue Origin to commercial-space-station company Axiom Space—are sending amateurs and tourists beyond the bounds of the atmosphere, CopSub’s hobbyists aren’t just the club’s potential future astronauts; they’re also the ones responsible for every machine, schematic, and protocol getting the rocket off the ground, a proposition that comes with significant risk. 

Given that, “space cowboys” is a pretty accurate term for what CopSub is doing and for what the law allows it to do. But the label also applies to the cushy spaceflight capsules supplied by billionaire-backed companies. Policies do exist to protect people on the ground—by requiring that rockets operate as advertised, that they lift off from places where an accident wouldn’t harm nearby civilians, and that their crews be trained in emergency procedures. But, unlike with government-funded missions, there are practically no guidelines, national or international, regarding the safety of humans who strap themselves aboard private rockets. 

That could change around October of this year, when a US moratorium on such rule-making expires, and Americans, at least, are finally able to regulate the safety of space tourists. Policy experts say it may be time to lay down some laws, making a trip to space safer not just for astronauts flying under the flag of a nation but also for those flying under the logo of a company—or the banner of a club.

“We’ve got more international actors. We’ve got different types of space applications. And then you’ve seen those wonderful space-tourism efforts that launched,” says Uma Bruegman, head of the Space Safety Institute at The Aerospace Corporation. “It’s great. But it does bring into the equation space safety.” 

While the world figures out what to do about these private astronauts, and which risks and regulations should be accepted, CopSub is creeping forward. The group is currently working on and testing the design of a homemade rocket that might take a human more than 62 miles above Earth’s surface in another decade. Whether that cosmic cowpoke will come home or take a one-way trip, though, is an open question—one to which few rules apply.

NO MATTER WHO’S in charge, there’s always risk involved in shooting humans into space. It requires sitting on top of what is essentially a missile—and that hasn’t always gone well, even in the highly regulated parts of the industry. In 1967, a NASA suborbital spacecraft called the X-15—which, like CopSub’s contraption, was meant to fly to the edge of space, but not circle Earth—broke apart after launch and killed its pilot. Then came the space shuttle Challenger and Columbia disasters in 1986 and 2003, respectively, which infamously caused 14 astronaut casualties in total. More recently, in 2014, Virgin Galactic’s suborbital test vehicle SpaceShipTwo disintegrated, resulting in the death of one pilot. In the 62 years since the first human went to space, the overall odds of an astronaut being in a fatal accident on a US craft has been 1 in 100. Compare that to a traveler on one of today’s passenger jets in the US and Europe—with their entirely different flight systems—for whom the odds are around 1 in 30 million.

“If we want to reap the full benefits of human spaceflight in the future, whether it be for exploration, scientific research, business, or tourism, we will need to find ways to improve the safety of those operations,” reads a 2020 paper titled “Human Spaceflight Safety: Regulatory Issues and Mitigating Concepts,” written by Josef Koller, systems director for the Center for Space Policy and Strategy at the Aerospace Corporation, and George Nield, president of the company Commercial Space Technologies.

One of those ways is through setting rules. But at this moment, at least in the private sector, there isn’t legal oversight of the safety of crew members. “There is no particular regulation with regards to putting people on board rockets and blasting them off into space,” says Jacob Larsen, who works in the satellite industry by day and for CopSub in his spare time. 

That’s as true of a for-profit company as it is of a volunteer-led organization like CopSub. “The only difference is, they’re not making any money,” says Scott Steele, a lawyer specializing in space issues. 

But is hobbyist spaceflight like CopSub’s too risky, even with a code of conduct? And if so, should a person be permitted to do it anyway, just like someone who is allowed to plop a raft into whitewater, dig a crampon into a glacier, or ride a mountain bike along a cliff’s edge? Does DIY human spaceflight lie beyond the border of any other extreme sport or hobby?

At the moment, no governing body—in Denmark, Europe more broadly, or even more space-centric countries like the US—is setting those rules. CopSub’s communications director, Mads Wilson, who works as a data scientist, doesn’t seem distressed by that fact. “There’s no laws against being stupid,” he says. “People have killed themselves in stupid ways.”

That’s certainly true of our species’s long and fraught fascination with flying. But when—and if—CopSub’s rocket gets its first joyrider, that person’s life will depend on the quality of work done in a group of tinkerers’ spare time, with homemade rocket parts, cobbled together into a combustible machine that no outside body is charged with inspecting. And that’s not an easy proposition to swallow.

WHEN COPSUB STARTED started in 2008, the team consisted of just two volunteers, the co-founders Kristian von Bengtson and Peter Madsen, and a single thought. “They wanted to try to build a rocket that could put a human in space,” says Wilson. “And that was basically it.”

Von Bengtson had previously been on contract with NASA, working on human-centered spacecraft design, and Madsen was an entrepreneur who, later, would be convicted of the murder of journalist Kim Wall. Three years before the murder took place, CopSub and Madsen parted ways, and the space organization cut all ties with its co-founder.

At the start of the endeavor, though, the pair holed up in an artists’ collective in Copenhagen Harbor. Soon, their group—and creative space—grew. “Most of the guys that I know say that they just showed up one day at the workshop and asked, ‘Hey, can I do something?’” says Wilson, who became one of those “guys” in 2013, a couple of years after CopSub started building rockets and launching them a mile or more into the air. It used a floating platform, which members built themselves, off the Danish coast in international waters. In the early days, the company was finishing and testing a new rocket every year or so, with the builds taking a year or two each.

CopSub’s first attempt—with a 30-something-foot-tall, 3,587-pound rocket in 2010—was a failure. In 2011, a ship with that same design (which resembled that of a ballpoint pen) went up, flopped sideways, and came down too fast. The booster slammed into the water, disintegrated, and sank. The prototype of the capsule meant for passengers separated from the rocket and floated across the Baltic Sea, but was also damaged. In 2012, the group shot up a rocket intended to test communications and GPS equipment for future crewed CopSub missions. Around two seconds after liftoff, the nose cone, which housed all those electronics, separated from the rocket. The vehicle completed its trip, which was designed to take it more than 12 miles up, as planned, but the flight didn’t yield any useful data. That year, CopSub tested a capsule with passenger safety features like an escape system, springs to protect a rider from a hard landing, and air bags that could flip the capsule right-side up should it splash facedown. It tumbled through the air and slammed hard into the water. CopSub was not able to send the command to flip the capsule upright because of the high-impact landing.

The next year, CopSub sent up a much smaller rocket—447 pounds and nearly 28 feet high—to try out navigation and directional systems. That one worked pretty well, surpassing the speed of sound and shooting more than 5 miles up, arriving at the top of its trajectory just 600 feet off from the engineers’ expectations. Still, the technology was a far cry from something that could transport an actual person to space. “It started out really crude,” says Wilson. “But that was also kind of the idea—it doesn’t need to be more than good enough.” (What Wilson means is that it doesn’t need to be more than good enough to fulfill its purpose.)

In fact, the amateur space program’s safety status banks on its rockets’ simplicity: Much of it is based on technology similar to what NASA used in the 1950s and 1960s. Just as a smart fridge has more points of failure than one made of mere coils and refrigerant, CopSub contends that a less complex space system has fewer breakable parts than one ruled by robotics and computers. If done right, it could leave fewer ways for a human passenger to get hurt. But if done sloppily or without adequate checks, it still could put the team’s future astronaut in fatal danger.

The group has made some improvements. To make their rockets easier to control, it had to rethink its original hybrid-propellant engines, which contained both solid and liquid rocket fuel. When it was go time, the two mixed together and combusted. “That turned out to be, to put it politely, unfeasible,” says Wilson. After building its Sapphire rocket in 2013, CopSub pivoted toward liquid-only engines—which are more complex but also more predictable. 

Madsen’s departure also brought much-needed change to the collective. In those early days, Madsen wasn’t getting along with von Bengtson, or, really, anyone. In February 2014, von Bengtson finally left. A few months later, CopSub and Madsen parted ways permanently. Madsen murdered Kim Wall in 2017 and was sentenced to life in prison in 2018. 

After the founders’ departure, the project didn’t dissolve. “This is too fantastic to just let everything drop on the floor,” says Wilson. Plus, much of the technical know-how came from the newer volunteers. The quest continued with the personnel who remained.

But the technical problems continued as well. In late 2014 an experiment, recorded on a GoPro, went awry. It was a static rocket-engine test using liquid fuel, in which the rocket was supposed to stay strapped to the ground. Just after ignition, flames broke out and engulfed both the craft and its stand. As the initial burst died down, the wrecked machine made moaning noises, like the cries of a lonely, whale-like alien. Wilson was standing in a bunker about 300 feet away. Even there, everything smelled like alcohol. No one was hurt, but the rocket was unsalvageable—two years of work burnt to the ground. What would they do now? 

“We’ve gotta build another one!” Olsen recalls thinking at the time.

Group members decided to emphasize working piecemeal, building smaller rockets and using them to test subsystems like computers, communications, and parachutes, a mission they’ve been working on after the fire. “Then, once that is done, we can scale [up] and build something bigger,” says Wilson. The ultimate goal is to create Spica, a rocket big enough to reach the Earth-space boundary and send a capsule splashing back down into the ocean—with a human inside. “We’ve meticulously chipped away at it,” says Larsen, since the last big test launch of a smaller rocket in 2018. Several sections sit in the workshop as the engineers tinker with the engine technology, which they’ll try out in a shipping container they transformed into a test stand. Once completed, the capsule will be just big enough for a person to sit inside, with only enough wiggle room that they don’t lose circulation. No astronaut suit or ability to control the flight, just a Top Gun–ish fighter-pilot get-up and a pressurized cabin. 

The collective’s biggest success so far came in 2018, when its liquid-fueled Nexø II rocket did everything it was supposed to do. It flew in the correct trajectory 4 miles up. The nose cone separated at the top of the flight, the parachute floated the rocket back down to the sea, and teams recovered both parts. The splashdown speed was slow enough that a human would have survived the force of impact.

Larsen was watching from a rigid inflatable boat nearby. As the craft ended its countdown and began its journey, time slowed down. “It just kept going and going and going,” he says. “I’m never, ever gonna forget this wonderous thundering sound under a clear sky…on a flat, warm sea, with nothing but blue and blue around us.” 

The capsule drifted down about eight minutes after the flight began—“Ever gently,” says Larsen. Only 58 miles left to go for the spaceflight to count as suborbital.

AS COPSUB INCHES CLOSER to its “moonshot,” private spaceflight is taking off an ocean away.

Only American companies have sent tourists to space. Still, Congress explicitly forbids the Federal Aviation Administration (FAA) from making rules to protect private astronauts. Under a 2004 law, “The FAA is prohibited from regulating the safety of individuals on board,” says the agency’s own website. This legal moratorium, the thinking goes, allows commercial space companies to get enough experience to understand what safety principles should exist—and keeps them from being stifled by inspections and red tape in the meantime. According to Koller, who works with Bruegman and co-wrote the “Human Spaceflight Safety” paper, the idea is that companies should be allowed to innovate, try hard things, and perhaps even fail before regulations come into play.

The moratorium is currently set to expire in October 2023, though it has been extended before (first to 2015, and then again for eight more years). Anticipating the coming rules, Koller and his co-author suggested ways the FAA and other governing bodies across the world could prepare. The broadest of these is by “establishing a collaborative framework to create safety guidance and best practices,” their report says. That could take the form of what it calls a “Space Safety Institute,” an independent group that provides expertise and support to government and industry but doesn’t set or enforce regulations itself. 

It didn’t take long for the authors’ vision to come to life. Last year, The Aerospace Corporation, headquartered in El Segundo, California, launched an institute to “enhance the safety of space and space-related activities for government, commercial, and international customers,” as described on its website. But one of the new group’s significant challenges will be coming up with recommendations for private space vehicles that vary wildly. Virgin Galactic, for example, wants to drop a rocket-powered spaceship from a double-hulled airplane, while Blue Origin is planning a much larger rocket powered by liquefied natural gas. CopSub, in comparison, still has its vintage ethanol-based rocket. There are even balloon companies that hope to heft humans to the edge of space in the future. 

Despite the fact that space vehicles rely on different technologies, they do share one thing. “The common element really, at the core, is people,” says Koller. “People are the ones that make mistakes. But people also need to feel safe enough to speak up when you see an unsafe situation or unsafe environment.” Perhaps the most important way to keep space tourists safe, Koller posits, is by creating a “safety culture,” one where engineers and technicians aren’t afraid to point out something that seems dangerous or sloppy. 

Bruegman’s institute also suggests voluntary safety audits, as well as collecting system and safety data in a centralized and accessible place, ideally so that companies can predict and prevent accidents based on others’ experience. (Meanwhile, a standard way companies manage their liabilities is by having passengers on private space vehicles sign an informed consent document stating that they know that what they are about to do has its risks. Passengers also sign waivers of claims stating that they will not sue the company in case of injury and that their families will not sue in case of the passengers’ injury or death.)

Self-starters in and outside the US can look to experienced agencies like NASA for more inspiration. In 2014, the FAA produced a document for private companies, detailing “Recommended Practices for Human Space Flight Occupant Safety.” It doesn’t get into much technical detail because, again, every organization’s system is so different, but rather prescribes high-level guidance about what safety really means. 

A spacecraft, for instance, shouldn’t accelerate or vibrate so fast or hard that the motions hurt occupants, and it should make sure they “are protected from serious injuries and safety-critical operations can be performed successfully.” Every system inside the ship that’s critical to crew safety should demonstrate that it can work as planned in maximally extreme conditions. Similarly, all those plopped into passenger seats should be evaluated to make sure they can withstand those conditions. Each crew member should have a pressurized suit and a personal air supply, and the cabin should have an abort or escape system. CopSub has plans only for the personal air supply at the moment. 

The technology aboard modern spaceships is complex in part so it can diagnose problems and introduce redundancy; that allows the craft to fail in numerous ways—without killing the crew. That complexity is one NASA requirement that CopSub won’t meet, but, Larsen points out, their craft only needs to be safe and dependable for a 4-minute flight, rather than days or weeks. The space agency also only certifies a private space company for its commercial crew program if the overall chance of “loss of crew” is less than 1 in 270 over a 210-day mission. That could be true of CopSub’s future Spica, but as things stand right now, no one is doing the math.

CopSub is currently testing its rocket subsystems to make sure they work both independently and together, but it won’t have the full results until Spica is completed years from now. At this point no outside agency will make the group conduct a full-scale test before putting a human aboard, or to ensure that that human passes extensive medical and high-G evaluations, as professional astronauts typically would. CopSub says it will do its own testing before it straps a person into its rocket, but for now, the Danish government and European Space Agency are just as hands-off as American authorities. 

It’s possible that the future will have enforceable rules, to which the team will have to adjust if its efforts are to go forward. Because space endeavors are often international and involve a borderless frontier, no single country—whether that be Denmark or the US—can think about rules in isolation. “There is more international coordination necessary,” says Koller. It could be something like the Safety of Life at Sea Treaty, an agreement first put in place after the Titanic disaster to specify safety requirements for merchant ships, including a minimum number of lifeboats. The International Space Station is another example of how nations at odds—Russia and the US—have played nice with each other.  

All this talk about rules and limits can get the more hands-off-my-rockets side of the industry riled up. But Bruegman, Koller, and Steele don’t want to hold any rocket scientists, even the hobbyist ones, down. On the contrary, they want to make private spaceflight secure and predictable precisely so it can blossom, Bruegman says. “We feel like it’s like ‘good fences make good neighbors.’”

AT COPSUB, the volunteers are proud of their own safety record so far: zero accidents resulting in injury or death. They claim they adhere to NASA’s protocols for handling rocket fuel and safety at the launch site. They also point out that they chose ethanol for fuel because it’s more environmentally friendly than methane and hydrocarbon-based rocket fuel and evaporates quickly if something goes wrong. Wilson and Larsen say the members do speak up when something feels iffy to them, promoting the kind of safety culture Koller referred to. 

But one part of CopSub’s light-touch approach might work in its favor, at least when it comes to developing rocket hardware. “I think both NASA and the European Space Agency have felt the pressure to be perfect,” says Larsen. “And I was so relieved when a certain American made it popular to start blowing things up in succession.”

He is referring to Elon Musk and SpaceX, a company with a blooper reel full of its rockets tipping, tumbling, and exploding. Despite those wipeouts, SpaceX has never had a launch accident that harmed humans, and it is the only company certified to NASA’s safety standards. 

Ethics don’t stop and start at the launchpad, however. In the fall of 2022, OSHA fined SpaceX after an employee was seriously injured while working on a rocket engine. Blue Origin, Jeff Bezos’ space company, has had six successful human spaceflights with zero injuries or deaths. Still, in 2021, a group of 21 current and former employees penned an open letter saying that taxing working conditions and intimidation were hampering the company’s safety culture. (SpaceX did not respond to a request for comment, and Blue Origin declined to comment.)

Working for a corporation full of professionals doesn’t, then, seem to guarantee a totally safe environment on the ground or in the skies. But CopSub’s organizational structure, which you wouldn’t see at a business that has to comply with labor laws and the demands of investors, may make accountability difficult: There is no top-down bureaucracy—no project managers, not even an inventory management system—which means checks and balances don’t automatically exist. Accountability is as voluntary as the gig itself.

The CopSub website puts the risk of Spica’s flight quite frankly. “We work meticulously to make the flight as safe as possible, as we’re courageous, not reckless,” it says. “But it will obviously be dangerous, so our astronaut must be mentally prepared and at ease with the risk.” 

While it’s clear that CopSub’s technology is decades behind the sophistication of modern companies like SpaceX and government agencies like NASA, its goals are simpler. But being the best, first, or fastest is not usually the point of hobbies; the point is to do something you like, with people you like, because you like it and them, and to feel empowered because you have done it on your own. The difference between constructing a rocket ship and knitting a sweater or building a homemade radio, though, is that sweaters and radios have little potential to kill the people who use them.

Of course, Olsen, Larsen, Wilson, and their fellow DIYers are aiming for survival. And they’re only hopeful, not certain, that they can even get to the point where they strap someone into Spica’s capsule. Still, optimism reigns. Olsen offers a quote from Pippi Longstocking, a famous figure in Scandinavia. “I have never tried that before,” she says, “so I think I should definitely be able to do that.” Will anyone make sure that this attitude doesn’t doom the first passenger in a DIY space mission? That’s up in the air.

Read more PopSci+ stories.

Correction 4/10/23: A previous version of the article stated that with a possible expiration of a US moratorium, Americans would be able to “legislate” the safety of space tourists, instead of “regulate.” PopSci regrets the error.

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I’ve always loved learning about the planets and stars, but it sure takes a lot to get me outside on a cold, dark night to see them with my own eyes. This week, though, there’s a celestial lineup I don’t want to miss—and you shouldn’t either!

What’s the big deal here?

Although there have been some wild theories about strange happenings during planetary alignments—like an increase in natural disasters—those have generally been debunked. Instead, the reason a planetary alignment is a big deal is that it’s simply cool to see. “You get to see pretty much the whole solar system in one night,” says Rory Bentley, UCLA astronomer and avid stargazer.

Usually, the planets are spread across the sky, visible at different times of the night (even into the early morning). They’re technically always in some version of a line—all our solar system’s planets appear on the ecliptic, an invisible arc across the sky tracing the plane where everything orbits the sun. If the planets are close enough together, though, they appear to be in an almost straight line. 

[Related: Astronomers just mapped the ‘bubble’ that envelopes our planet]

That’s precisely what’s happening on March 28. The five planets will come within 50 degrees of each other, a tight bunch compared to their usual spread, giving stargazers of all ages an opportunity to meet our planetary neighbors.

How to see the March 28 alignment

The time to spot this planetary parade is right after sunset on the March 28—no more than about 45 minutes after sundown, since Jupiter and Mercury will both disappear below the horizon fairly quickly. You’ll want to make sure you have a clear view of the western horizon, where the sun sets and Jupiter and Mercury will follow close behind. 

Jupiter will be closest to the horizon, easy to spot even in the lingering sunlight of dusk since it’s so bright. Mercury will be nearby—possibly visible to the naked eye, and definitely visible with binoculars. A bit higher up in the sky you’ll find Venus, shining intensely from its ultra-reflective thick clouds. It’s accompanied by Uranus, just a bit above—and for this one, you’ll definitely need those binoculars. Bringing up the tail end of the parade is Mars, up even higher in the sky near the crescent moon. (Bonus: you can see the moon, too, while you’re at it.)

If you’re not completely sure how to tell what’s a planet, know that the planets you see with your naked eye will generally be brighter than everything around them, and if you look really closely they won’t twinkle quite like stars.

You should be able to spot at least three of the parade participants (Jupiter, Venus, and Mars)—possibly even a fourth (Mercury)—with just your eyes if you’ve got good eyesight and/or a clear sky. Grab some binoculars or a telescope, and you can collect all five planets. Venus and Uranus will be visible until they dip below the horizon about three hours after sunset, and Mars stays out past midnight.

Another benefit to using a decently sized pair of binoculars or a telescope is that you’ll get to see a slew of neat planetary features as the alignment glides by. You should be able to spot Saturn’s famous rings, and possibly even some of the colorful cloud bands of Jupiter. Although you won’t notice any surface features on Venus, you will be able to determine what phase it’s in, since Venus has phases (crescent, full, etc.) similar to our moon. Keep in mind that it’s easier to see details when you have clear, still skies, and are looking overhead. The closer your target gets to the horizon, the more of Earth’s atmosphere you end up looking through, making viewing more difficult.

The Pleiades, a star cluster known across many cultures as the seven sisters, also shines between Venus and Mars. You may recognize this particular arrangement of stars from the logo on Subaru automobiles—it’s no coincidence, because Subaru is actually the Japanese name for this cluster. You’ll likely be able to see this one with just your eyes, even in a big city like Los Angeles.

[Related: Why we turn stars into constellations]

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An asteroid roughly the size of a 20-story building—that’s  big enough to wipe out a whole city full of skyscrapers—is expected to fly between the Earth and the moon on March 24th and March 25.

Discovered only a month ago, the asteroid known as 2023 DZ2 will pass within 320,000 miles of the moon on Saturday and then zip by the Indian Ocean at roughly 17,500 miles per hour. It will be closest to Earth on March 25 at about 3:50 PM EDT. 

[Related: DART left an asteroid crime scene. This mission is on deck to investigate it.]

This close encounter—by planetary standards—will give astronomers a chance to study this space rock from a bit over 100,000 miles away. This distance is only half the distance from the Earth to the moon, which means the newly discovered asteroid is visible through binoculars and telescopes in the right locations. Those in the Northern Hemisphere will have the best chance to spot it through telescopes during the evening on March 24.

“There is no chance of this ‘city killer’ striking Earth, but its close approach offers a great opportunity for observations,” the European Space Agency’s planetary defense chief Richard Moissl said in a statement, according to the Associated Press.

NASA further confirmed this message of calm on Twitter earlier this week, adding that 2023 DZ2’s close approach will help astronomers to learn more about asteroids. “Astronomers with the International Asteroid Warning Network are using this close approach to learn as much as possible about 2023 DZ2 in a short time period – good practice for #PlanetaryDefense in the future if a potential asteroid threat were ever discovered,” NASA wrote in Tweet.

For a little while, 2023 DZ2 posed a very slight risk of impacting Earth on March 27, 2026. Lucky for Earthlings, it was removed from the Sentry Risk Table as of March 21, 2023.

The Virtual Telescope Project will also provide a live webcast of 2023 DZ2’s close approach.

A group of astronomers at the Roque de los Muchachos Observatory in Spain discovered the asteroid in late February and have been studying the space rock’s size, orbit, and anticipated trajectory. It’s estimated to be between 140 and 310 feet in diameter. 

A different asteroid that was also discovered in February named 2023 DW possibly carries a larger risk to Earth down the road. The European Space Agency put it on the top of its Risk List and predicts a 1 in 607 chance that it could impact Earth. Estimates say a collision could occur around February 14, 2046, but it could also occur on subsequent Valentine’s Days between the years 2047 and 2051. 

[Related: NASA’s first attempt to smack an asteroid was picture perfect.]

In the meantime, scientists are learning more about asteroids following NASA’s successful DART mission in September, which smashed a car-sized spacecraft into an asteroid named Dimorphos in an attempt to knock it off its orbit. In September 2022, NASA’s planetary defense officer Lindley Johnson told PopSci that DART is a “significant milestone” in humanity’s capabilities to protect the planet from such a dark outcome.

“This is the first time that humankind acquired the knowledge and the technology to start to rearrange things a little bit in the solar system, if you will, and make it a more hospitable place for life,” Johnson said.

The European Space Agency’s Hera will soon follow DART’s trail to study its aftermath in more detail. That mission is scheduled for an October 2024 departure from Cape Canaveral in Florida, on the wings of a SpaceX Falcon 9 rocket. Its itinerary as of March 2023 has it arriving at Didymos and its small moonlet Dimorphos and in late 2026 for about six months of sightseeing. If the conditions allow, Hera will try to make a full landing on Didymos.

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Third time was unfortunately not the charm for Relativity Space. After two scrubbed attempts, Terran—the aerospace startup’s 110-foot rocket largely composed of 3D-printed materials—completed its first stage liftoff from Cape Canaveral Space Force Station on Wednesday night. Unfortunately, it failed to reach its intended 125-mile-high orbit. Instead, the unmanned vehicle’s second stage briefly ignited, before shutting off entirely and subsequently plummeting into the Atlantic Ocean. Still, there’s much to celebrate for the upstart rocket company.

Supporters hope Relativity’s Terran rocket, which is made from 85-percent 3D-printed metal materials, will prove a major step forward for the company as it attempts to compete within the private spacefaring industry alongside the heavy hitters of Elon Musk’s SpaceX and Jeff Bezos’ Blue Origin. During its second launch attempt earlier this month, Terran came within less than a second of takeoff before aborting the flight after its first stage rockets malfunctioned.

[Related: What to expect from space exploration in 2023.]

Formed in 2015, Relativity Space aims to create a line of entirely 3D-printed, reusable rockets for a variety of potential projects, including a goal to transport the first commercial mission to Mars. According to its official website rundown, the company’s line of hopeful spacefaring vehicles in Long Beach, California, are built using a combination of massive 3D printers, artificial intelligence aids, and autonomous robotics. In doing so, Relativity claims production requires 100 times fewer parts, and can be finished in less than 60 days.

The commitment to 3D-printed material even extends as far as Relativity’s line of Aeon rocket engines, with reduced part counts within the igniters, turbopumps, combustion chambers, thrusters, and pressurization systems. Each engine uses a combination of liquid oxygen and liquid natural gas as propellants.

[Related: How loud is a rocket launch?]

Success, in this case, is… well, relative. As TechCrunch notes, very few space launch platforms ever achieve orbit during the first flight. Additionally, Terran withstood its “Max Q” threshold, a term referring to when the vehicle encounters the most atmospheric stress and resistance, as well as successfully cut off main engines and separated from the first stage as planned. In this sense, Relativity proved that 3D-printed rockets can hold up during some of the most intense moments involved in an orbital launch, which is certainly reason enough to celebrate.

“Maiden launches are always exciting and today’s flight was no exception,” said Relativity Space launch commentator Arwa Tizani Kelly following Wednesday’s launch attempt.

Representatives for Relativity did not respond for comment at the time of writing. It is unknown if Wednesday’s results will affect future rocket launch timelines, including plans to test the company’s larger Terran R spacecraft in 2024.

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When NASA’s Hubble Space Telescope takes an image of a star field, it usually looks more like an abstract painting than a real piece of the universe. In the case of globular cluster M14, those drops of white, blue, and orange paint are more than 150,000 stars packed at the periphery of a spiral galaxy 29,000 light-years away from Earth.

Of course, NASA has shared many stunning views of the universe since Hubble was launched in 1990, but this newly processed image has another claim to fame—it’s known as Messier 14, one of the dozens of celestial objects cataloged by French astronomer and comet hunter Charles Messier beginning in 1758. The objects are bright and relatively easy to see with small ground telescopes, and so are popular with the amateur astronomy community.

But five years ago, the NASA Hubble team decided to begin posting the legendary space telescope’s observations of the vintage catalog online “to give people a chance to view the Messier objects in a way that they might not otherwise be able to do, especially since in many cases we can see colors of light that don’t get through the atmosphere,” says Hubble Operations Project Scientist Kenneth Carpenter. “People can’t see the ultraviolet, for instance, when they look with their ground telescopes.”

Messier was born in 1730 and developed a fascination with comets, ultimately discovering the “Great Comet” of 1769, which exhibited an extremely long tail as it passed near Earth. His catalog grew out of his notes on sightings from the Northern Hemisphere that could be confused as streaking balls of ice and dust to keep other comet seekers from wasting their time. The series includes globular star clusters like M14, nebulae such as the Eagle Nebula (M16) and Crab Nebula (M1), and even the Andromeda galaxy (M31). The numbers indicate the order in which Messier discovered the objects, though he only found 103 of the current 110—additions were made by other astronomers in the mid-20th century.

[Related: Your guide to the types of stars, from their dusty births to violent deaths]

The Hubble Messier Catalog is much newer, according to James Jeletic, NASA’s deputy project manager for Hubble. In 2017, his team was brainstorming ways to get the amateur astronomy community involved and feeling more connected with Hubble science. ”So we said, ‘Well, let’s go back to that Messier catalog,” he recalls. “That way, amateur astronomers can look at an object in their telescope, and then compare it to what Hubble sees.”

The scavenger hunt is not yet complete—the Hubble Messier Catalog currently exhibits images of 84 of the 110 Messier objects and plots them on an interactive map—but that’s partly because of the way in which the Hubble team has gone about building out the collection. They don’t purposefully take new images of Messier objects to add to the catalog; rather they wait for a scientific proposal that overlaps with the targets. That, or they comb through the Hubble archive looking for suitable scenes that haven’t been published yet and process them (as was the case with M14). “We think we found all the ones, for the most part, that are worthy of creating an image out of,” Jelectic explains. “We’re going to search one more time, you know, just to make sure.”

The Hubble team shared the image of M14 on March 19 as part of what’s called a Messier Marathon, an attempt by amateur astronomers to observe all 110 objects in a short time frame; the skygazing conditions in March and early April are considered particularly conducive to Messier Marathons because all of the objects can be seen in a single night around the spring equinox. “If you can view all 110, no matter how long it takes, you become a member of the [official Messier club] and get a certificate and pin,” Jelectic says.

For those in the Southern Hemisphere, the NASA Hubble website also includes images from the Caldwell Catalog, a collection of 109 objects visible compiled in the 1980s by English amateur astronomer Patrick Moore as a counterweight to the Messier Catalog.

[Related: Researchers found what they believe is a 2,000-year-old map of the stars]

Reflecting on the fact that astronomers, both professional and amateur, and the general public are still fascinated by objects first cataloged more than 200 years ago, Carpenter says it illustrates how science progresses over time.

“Every time you build a new telescope, whether it be on the ground or in space, that’s either larger in size so it’s more sensitive, or sensitive to a different color of light than we’ve had previously, you make wonderful new discoveries,” he says. Even after years in the field it still astonishes him what telescopes can seek. “It is just absolutely incredible, both in terms of the science and just in terms of the sheer beauty. I think a telescope is really as much a tool of art, of the creation of art, as it is of the creation and interpretation of science.”

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Literally weighing the universe may sound like an impossible task, but it can be done—at least to a degree. For decades, astrophysicists turned to what’s known as “integrated electron pressure” as a proxy for measuring the mass of galaxy clusters, which involves the interaction of photons and gravity, among many other complicated factors. But that stand-in is by no means perfect, and often can result in less-than-reliable measurements depending on galaxy clusters’ various influences. Now, however, researchers believe they have developed a (relatively speaking) simple solution to the issue alongside some assistance from artificial intelligence.

As detailed this month in a paper published with Proceedings of the National Academy of Scientists, a team composed of researchers from the the Institute for Advanced Study, the Flatiron Institute’s Center for Computational Astrophysics (CCA), Princeton University, and elsewhere have utilized an AI tool called “symbolic regression” to hone their galactic weigh-ins. As a statement from collaborators at the CCA explains, the tool “essentially tries out different combinations of mathematical operators—such as addition and subtraction—with various variables, to see what equation best matches the data.”

[Related: We finally have a detailed map of water on the moon.]

The team first entered a cutting edge universe simulation featuring a host of galaxy clusters into the tool, then the AI located variables that could increase mass estimations’ accuracy. From there, the AI generated a new equation featuring a single new term atop the longstanding version focused on integrated electron pressure. Working backwards, researchers discovered that gas concentration corresponds to areas of a galaxy cluster featuring less reliable mass estimations—i.e. the supermassive black holes located within galactic cores.

“In a sense, the galaxy cluster is like a spherical doughnut,” the CCA’s announcement describes. “The new equation extracts the jelly at the center of the doughnut that can introduce larger errors, and instead concentrates on the doughy outskirts for more reliable mass inferences.”

In any case, the team plugged the AI-scripted new equation into a digital suite containing thousands of simulated universes, and found that it could produce galaxy cluster mass estimates with between 20 and 30 percent less variabilities. “It’s such a simple thing; that’s the beauty of this,” study co-author and CCA researcher Francisco Villaescusa-Navarro said in the announcement. “Simple,” of course, may be a bit of an overstatement to those not in the business of weighing galaxies, but one thing is for certain—a jelly donut sounds pretty good right now.

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Since its discovery in 2017, the interstellar object ‘Oumuamua has been a point of fascination—and sometimes obsession—for astronomy fans. As the first object we’ve seen from another solar system, it’s naturally drawn a lot of interest, with its strange tube-like shape and surprisingly small size. It even accelerated at one point in its orbit, which happens regularly with comets—but ‘Oumuamua didn’t have the usual gassy tail, leading some to even propose it may be an alien ship.

A new hypothesis, published on March 22 in the journal Nature, proposes a different explanation for ‘Oumuamua’s anomalous orbit. Astronomers Jennifer Bergner and Darryl Seligman say the half-mile-long object is just a comet after all, but that its time in interstellar space changed its chemistry. Instead of water causing the extra propulsion, ‘Oumuamua released nearly invisible hydrogen.

“It’s exciting that we can explain the strange behavior of ‘Oumuamua without needing to resort to any exotic physics,” says Bergner, an astrochemist at the University of California, Berkeley and lead author on the new paper.

“Hopefully this discovery will put to rest any outlandish ideas about ‘Oumuamua being an alien probe,” adds University of Washington astrobiologist Kaitlin Rasmussen, author of the upcoming book Life in Seven Numbers: The Drake Equation Revealed.

Comets are chunks of ice and debris left over from the process of planet formation, lurking at the edge of our solar system. On their extremely long and stretched out orbits, they occasionally dive in towards the sun. There, the sun’s bright rays vaporize some of the comet’s ice and dust to make the fuzzy coma and the sweeping tails we see. 

[Related: Scientists finally solve the mystery of why comets glow green]

‘Oumuamua may have begun its life as a typical comet around another star—rich with water ice—before being thrust out into open space by the chaos of a young solar system. (Our solar system likely spewed out similar chunks of detritus in its early days.) On its voyage between the stars, Bergner and Seligman propose that ‘Oumuamua was bombarded with energetic particles known as cosmic rays. These high-energy particles broke the bonds between hydrogen and oxygen in water molecules, creating molecular hydrogen (H₂) trapped in the crystalline structure of the ice.

Once ‘Oumuamua swung by the sun, the heat rearranged the crystals of its ice, releasing the molecular hydrogen to propel the interstellar interloper and cause its observed acceleration, almost like a rocket booster. “It’s more plausible than the other ideas,” says UCLA astronomer David Jewitt, “including those relying on carbon monoxide (which was not detected), nitrogen ice (which is relatively hard to find), and, of course, the spaceship idea.”

“I think the authors have a very interesting hypothesis,” agrees Caltech planetary scientist Qicheng Zhang, who is not affiliated with the research team. The real significance of this result, though, will come with further observations, he adds. 

‘Oumuamua was only invisible for a short time when it passed within 15 million miles of Earth in 2017; now on Pluto’s fringes, it’s far beyond the reach of even our largest telescopes. As an alternative to direct data, Bergner and Seligman suggest studying a similar effect on ‘Oumuamua-sized comets from our own solar system. But there’s one catch—we haven’t spotted any solar system comets that small yet. Astronomers hope the next generation of telescopes, including NASA’s recently launched James Webb Space Telescope, will spot the first of those objects.

[Related: The Milky Way could have dozens of alien civilizations capable of contacting us]

Casey Lisse, an astronomer at Johns Hopkins Applied Physics Lab, also suggests that a comet’s H₂ may be observable if it splits apart into two hydrogen atoms under the influence of the sun’s ultraviolet rays. The signal on a ‘Oumuamua look-alike could be picked up by certain satellites like SOHO, NASA’s long-running solar space telescope, “which are known to measure bright comets,” he says.

Astronomers also expect to root out many more interstellar objects in the coming years; they recorded the second one, known as comet 2I/Borisov, in 2019. “There’s approximately one similar object in the inner solar system at any given time,” says Seligman, Cornell astronomer and co-author on the Nature study. “When we get the Rubin Observatory and the NEO [Near-Earth Object] Surveyor going, we’ll be discovering way more.”

Astronomers think of these interstellar objects as a window into other solar systems: the closest peek we’ll get at the building blocks of other planets. “Any object of interstellar origin is incredibly valuable to us because it’s bringing clues about the processes going on beyond our solar system,” says Bergner.

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If you’ve ever been to the beach on a windy day, you’ve likely been treated to the not so fun feeling grains of sand hitting your face. That unpleasant experience would a walk in the park compared to what scientists have now discovered is happening in the atmosphere of the exoplanet VHS 1256 b.

A team of researchers using the James Webb Space Telescope (JWST) found that the planet’s clouds are made up of silicate particles that range in size from tiny specks to small grains.  The silicates in the clouds are swirling in nearly constant cloud cover. Silicates are common in our solar system and make up about 95 percent of Earth’s crust and upper mantle.

[Related: These 6 galaxies are so huge, they’ve been nicknamed ‘universe breakers.’]

During VHS 1256 b’s 22-hour day, the atmosphere is continuously rising, mixing, and moving. This motion brings hotter material up and pushes colder material down, the way hot air rises  and cool air sinks on Earth. The brightness that results from this air shifting is so dramatic that the team on the study say it is the most variable planetary-mass object known to date. 

The findings were published March 22 in the The Astrophysical Journal Letters. The team also found very clear detections of carbon monoxide, methane, and water using JWST’s data and even evidence of carbon dioxide. According to NASA, it is the largest number of molecules ever identified all at once on a planet outside our solar system.

VHS 1256 b is about 40 light-years away from Earth and orbits two stars over a 10,000-year period. “VHS 1256 b is about four times farther from its stars than Pluto is from our Sun, which makes it a great target for Webb,” said study co-author and University of Arizona astronomer Brittany Miles, in a statement. “That means the planet’s light is not mixed with light from its stars.” 

The temperature in the higher parts of its atmosphere where the silicate clouds churn daily reach about 1,500 degrees Fahrenheit. JWST detected both larger and smaller silicate dust grains within these clouds that are shown on a spectrum. 

“The finer silicate grains in its atmosphere may be more like tiny particles in smoke,” said astronomer and co-author Beth Biller of the University of Edinburgh in Scotland, in a statement. “The larger grains might be more like very hot, very small sand particles.”

[Related: JWST has changed the speed of discovery, for better or for worse.]

Compared to more massive brown dwarfs, VHS 1256 b has low gravity, so its silicate clouds can appear and remain higher up in its atmosphere where JWST can detect them. It is also quite young as far as planets are concerned, at only 150 million years old. As with most young humans, it’s going through some turbulent times as it ages. 

The team says that these findings are similar to the first “coins” pulled out of a treasure chest of data that they are only beginning to rummage through. “We’ve identified silicates, but better understanding which grain sizes and shapes match specific types of clouds is going to take a lot of additional work,” said Miles. “This is not the final word on this planet – it is the beginning of a large-scale modeling effort to fit Webb’s complex data.”

While these features have been spotted on other planets in the Milky Way by other telescopes, only one at a time was typically identified, according to the team. They used JWST’s Near-Infrared Spectrograph (NIRSpec) and the Mid-Infrared Instrument (MIRI) to collect the data and says that there will be much more to learn about VHS 1256 b as scientists sift through the data.

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On September 26, 2022, eyes around the world were laser focused on NASA’s Double Asteroid Redirection Test (DART). The car-sized spacecraft collided with an asteroid named Dimorphous about 68 million miles from Earth. The experiment of Earth’s asteroid deflection capabilities was a smashing success, and the event is now giving astronomers the chance to learn more about the material expelled from a space rock’s impact.

Two papers using data and observations taken with the European Southern Observatory’s Very Large Telescope (VLT) in Chile were recently published, offering new insights into the debris clouds from asteroids. 

[Related: DART left an asteroid crime scene. This mission is on deck to investigate it.]

The first study,  published in the journal Astronomy & Astrophysics Letters, utilized an instrument called a Multi Unit Spectroscopic Explorer (MUSE) to follow the evolution of the cloud of debris from the collision for a month. Since asteroids are some of the building blocks that constructed our solar system, studying the material ejected from this impact can help astronomers learn more about how the solar system formed. 

The authors found that the ejected cloud was bluer than the asteroid was before the impact with DART. This means that the cloud could have been made with very fine particles. In the initial hours and days after the test, clamps, spirals, and a long tail developed. The spirals and tail were redder than the initial debris cloud, which means they were possibly made with larger particles.

“Impacts between asteroids happen naturally, but you never know it in advance,” Cyrielle Opitom, study co-author and astronomer from University of Edinburgh, said in a statement. “DART is a really great opportunity to study a controlled impact, almost as in a laboratory.”

Using MUSE allowed the team to break up light emitted from the impact cloud into a rainbow-like pattern and then search for traces of different gasses. They particularly searched for oxygen and water coming from ice that was exposed by the impact with DART, but did not find either. 

“Asteroids are not expected to contain significant amounts of ice, so detecting any trace of water would have been a real surprise,” said Opitom. 

They were also not able to detect any traces of the propellant DART used, as there likely wouldn’t have been enough left in the tank from the spacecraft’s propulsion system.

A second paper was published in the Astrophysical Journal Letters analyzed how colliding with DART changed the surface of Dimorphous.This team, led by Stefano Bagnulo, studied particularly the change in polarization of the asteroid.  When polarization occurs, light waves oscillate along a preferred direction rather than randomly.  Tracking how this changes with the orientation of the asteroid relative to both Earth and the sun shows what the structure and composition of the asteroid’s surface is like.

[Related: NASA is pumped about its asteroid-smacking accuracy.]

To do this, they used the telescope’s FOcal Reducer/low dispersion Spectrograph 2 (FORS2) instrument. They found that the level of polarization suddenly dropped after DART’s impact with Dimorphous and that the overall brightness of the asteroid system increased at the same time.

The team believes that one possible explanation is the impact with DART may have exposed more pristine material from inside the asteroid. “Maybe the material excavated by the impact was intrinsically brighter and less polarizing than the material on the surface, because it was never exposed to solar wind and solar radiation,” said Bagnulo, an astronomer at Armagh Observatory and Planetarium and study co-author.

It is also possible that the direct impact destroyed the particles on the surface and ejected much smaller ones into the cloud of debris.Both studies highlighted what the VLT—which boasts four almost 30-foot-long telescopes—can do.

“This research took advantage of a unique opportunity when NASA impacted an asteroid, so it cannot be repeated by any future facility,” said Opitom. “This makes the data obtained with the VLT around the time of impact extremely precious when it comes to better understanding the nature of asteroids.”

Other studies on this “picture perfect” asteroid collision found that the asteroid lost over two million pounds after the collision, altered the asteroid’s moonlet orbit by about 33 minutes, and that the experiment showed that a “kinetic impactor mission” can alter an asteroid’s trajectory and is a step towards preventing future asteroid strikes.  

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IN 1989, rock-and-roll legend Chuck Berry attended one of the biggest parties of the summer. The bash wasn’t a concert, but a celebration of two space probes about to breach the edge of our solar system: NASA’s Voyager mission. 

Launched from Cape Canaveral, Florida, in 1977, identical twins Voyager 1 and 2 embarked on a five-year expedition to observe the moons and rings of Jupiter and Saturn, carrying with them Golden Records preserving messages from Earth, including Berry’s smash single “Johnny B. Goode.” But 12 years later, out on the grassy “Mall” of NASA’s Jet Propulsion Laboratory, scientists celebrated as Voyager 2 made a previously unscheduled flyby of Neptune. Planetary scientist Linda Spilker remembers the bittersweet moment: the sight of the eighth planet’s azure-colored atmosphere signaled the end of the mission’s solar system grand tour.

“We kind of thought of it as a farewell party, because we’d flown by all the planets,” says Spilker. “Both of them were well past their initial lifetimes.”

Many in the scientific community expected the spacecrafts to go dark soon after. But surprisingly, the pair continued whizzing beyond the heliopause into interstellar space, where they’ve been wandering ever since, for more than three decades. Spilker, now the Voyager mission project scientist, says the probes’ journeys have shed light on the universe we live in—and ourselves. “It’s really helped shape and change the way we think about our solar system,” she says. 

Currently traveling at a distance between 12 and 14 billion miles from Earth, Voyager 1 and 2 are the oldest, farthest-flung objects ever forged by humanity. Nearly five decades on, the secret to Voyager’s apparent immortality is most likely the spacecrafts’ robust design—and their straightforward, redundant technology. By today’s standards, each machine’s three separate computer systems are primitive, but that simplicity, as well as their construction from the best available materials at the time, has played a large part in allowing the twins to survive. 

For example, the spacecrafts’ short list of commands proved versatile as they hopped from one planet to the next, says Candice Hansen-Koharcheck, a planetary scientist who worked with the mission’s camera team. This flexibility of its operations allowed engineers to turn the Voyagers into scientific chameleons, adapting to one new objective after another.

As the machines puttered far from home, new discoveries, like active volcanoes on Jupiter’s moon Io and a possible subsurface ocean on neighboring Europa, helped us realize that “we weren’t in Kansas anymore,” says Hansen-Koharcheck. Since then, many of the tools that have contributed to Voyagers’ success, such as optics and multiple fail-safes, have been translated to other long-term space missions, like the Saturn Cassini space probe and the Mars Reconnaissance Orbiter. 

Both Voyagers are expected to transmit data back to Earth until about 2025—or until the spacecrafts’ plutonium “batteries” are unable to power critical functions. But even if they do cease contact, it’s unlikely they will crash into anything or ever be destroyed in the cosmic void. 

Instead, the Voyagers may travel the Milky Way eternally, both alone and together in humanity’s most spectacular odyssey. 

Read more PopSci+ stories.

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Water is key for life here on Earth, and it will be key for humans to travel around the solar system as well. It’s a heavy resource to lug aboard a spacecraft, so it’s best to get it from your destination when possible. Thankfully, there’s already some water on the moon—and astronomers just got a better look at where it is exactly.

New observations from the SOFIA airborne observatory (which completed its final flight in September 2022) produced a detailed map of water molecules near the moon’s South Pole. These results, recently accepted to the Planetary Science Journal and presented at the annual Lunar and Planetary Science Conference last week, are answering a critical question for both geology and future human exploration: Where can we find water on the moon?

“We don’t really know the basics of where [the water] is, how much, or how it got there,” says Paul Hayne, a planetary scientist at the University of Colorado not affiliated with the new research.

[Related: Mysterious bright spots fuel debate over whether Mars holds liquid water]

NASA’s 2010 LCROSS mission first sparked interest in the southern end of the moon when its radar revealed frozen water stored in places where the sun’s light can’t reach, like the bottoms of craters. A slew of follow-up observations by India’s Chandrayaan probes added further evidence for lunar water, but there was a catch—what astronomers identified as possible water molecules (H₂O) could have been a different arrangement of hydrogen and oxygen called hydroxyl (OH). SOFIA, however, had the power to search for a wider range of molecular signatures, meaning it could scan for a surefire sign of water instead of something that could be confused for hydroxyl. 

“These observations with SOFIA are important because they definitively map the water molecules on the sunlit surface of the moon,” says NASA Lunar scientist Casey Honniball, co-author on the new study. An accurate map of the icy areas can help planetary scientists distinguish between different ways water moves across the lunar surface, and learn how the life-giving compound got there in the first place. 

“We see more water in shady places, where the surface temperature is colder,” says William T. Reach, director of SOFIA and lead author on the paper. This is similar to how ski slopes facing away from the sun retain more of their snow here on Earth.

Researchers are considering two main scenarios to explain the origins of lunar water: evaporating water from comets that crashed into the moon, or water trapped in volcanic minerals created long ago. The SOFIA data hasn’t helped them to narrow down the source yet. “These are observations, and they don’t come labeled with a nice, tidy explanation,” adds Reach.

Although his team is still figuring out the provenance of the observed water, detecting it at all could be a boon for future human space exploration. A confident claim of water on the south pole of the moon explains “why we are targeting these regions so intently for the next phase of human and robotic lunar exploration,” says UCLA planetary scientist Tyler Horvath, who was not involved in the project.

Unfortunately, SOFIA can’t continue mapping the moon’s water—the modified Boeing 747 and telescope are now retired to the Pima Air & Space Museum in Tucson, Arizona. “I hope these results help pave the way for another one of these airborne observatories to be developed in the near future,” says Horvath.

[Related: Saying goodbye to SOFIA, NASA’s 747 with a telescope]

Despite the project’s untimely end, SOFIA managed to complete a large number of observations of the moon—among other celestial targets—in its final flights. In fact, it produced so much data that scientists are still sorting through it all. SOFIA’s discoveries “will continue for years to come,” says Honniball, and could prepare teams for future missions, all tackling questions about H₂O. Some prime examples include CalTech’s Lunar Trailblazer orbiter launching later this year, NASA’s water-hunting Volatiles Investigating Polar Exploration Rover (VIPER), and of course, the US Artemis program, which aims to land humans on the satellite’s southern regions as early as 2025.

These upcoming projects also promise the tantalizing prospect of delivering lunar soil samples back to Earth, something that hasn’t happened (for Americans, at least) since the Apollo program. “In the lab, even a single grain is like a world of its own revealing stories about the history and evolution of the material on the moon,” says Reach. Actually working with samples of lunar ice in a hands-on experiment could finally determine what form water takes on the moon.

Until then, planetary scientists will keep working through SOFIA’s moon maps, squeezing out every last drop of information they can.

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Even if humans may not arrive on Mars for (at least) a decade or two, when they do get there, they’ll have to procure shelter of some kind. To help towards that end, researchers from the University of Manchester in England have developed a new building material for future visitors to Mars that is twice as strong as traditional concrete and primarily composed of just potato starch, a bit of salt, and Martian dirt. It’s even already got a solid name to boot: StarCrete.

Judging by what is known about the environment on the Red Planet, humans won’t have a whole lot to work with once they get to Mars. That’ll be a bit of a challenge, of course, since space for supplies will be limited on the rides over, so astronauts will need to be extremely resourceful to make things work. Building structures are key to that survival, and while there are a number of high-tech possibilities, one of the most promising and strongest could be comparatively one of the simplest to achieve.

[Related: With Artemis 1 launched, NASA is officially on its way back to the moon.]

As recently detailed in a paper published in the journal Open Engineering, a team at the University of Manchester capitalized on the fact that potato starches are a likely feature of any upcoming Mars excursions’ menus. According to the team’s estimates, a roughly 25 kg (55 pounds) sack of dehydrated potatoes include enough starch for half a metric ton of their StarCrete—enough to compile around 213 bricks for structures. By combining the starch with salt and magnesium chloride taken either from Martian soil or even astronauts’ own tears, StarCrete strength increased dramatically, and could even be baked at normal microwave- or home-oven temperatures.

In their own laboratory tests using simulated Martian regolith—aka dirt—scientists measured a compressive strength of 72 Megapascals (MPa), or roughly twice that of regular concrete’s 32 MPa rating. As an added bonus, creating a similar mixture using mock moon dust showed a compressive strength of over 91 MPa, meaning the StarCrete variant is also a possibility for humans’ upcoming return to the moon.

[Related: NASA’s Curiosity rover captures a moody Martian sunset for the first time.]

Aled Roberts, the project’s lead researcher and a fellow at the university’s Future Biomanufacturing Research Hub, explained StarCrete can step in as alternative options remain far off from practical implementation. “Current building technologies still need many years of development and require considerable energy and additional heavy processing equipment, which all adds cost and complexity to a mission,” Roberts said in a statement, adding, “StarCrete doesn’t need any of this and so it simplifies the mission and makes it cheaper and more feasible.”

Meanwhile, Roberts’ team isn’t waiting for StarCrete’s potential Martian benefits. Their startup, DeakinBio, is looking to see how similar material could be employed here on Earth as a cheap, greener, alternative to existing concrete materials. At least none of the new building options require Roberts’ suggestion from previous research—a mixture that required human urine and blood for solidification.

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The universe has a dark side—it’s filled with dark matter and dark energy. Dark matter is the unseen mass floating around galaxies, which physicists have searched for using giant vats of ice, particle colliders, and other sophisticated techniques. But what about dark matter’s stranger sibling, dark energy? 

Dark energy is the term given to something that is causing the universe to expand faster and faster as time goes on. The great puzzle facing cosmologists today is figuring out the identity of that “something.”

“We can tell you a lot about the properties of dark energy and how it behaves,” says astrophysicist Tamara Davis, a professor at the University of Queensland in Australia. “However, we still don’t know what it is. That’s the big question.”

How do we know dark energy exists?

Astronomers have long known that the universe is expanding. In the early 1900s,  Edwin Hubble observed galaxies in motion and created Hubble’s Law, which relates a galaxy’s velocity to its distance from us. At the end of the 20th century, though, new detections of supernovae in far-off galaxies revealed a conundrum: The expansion of the universe isn’t constant, but is instead speeding up.

“The fact that the universe is accelerating caught us all by surprise,” says University of Texas at Austin astrophysicist Katherine Freese. Unlike the attractive force of gravity, dark energy must create “some sort of repulsive behavior, driving things apart from one another more and more quickly,” adds Freese.

Many observations since the 1990s have confirmed that the universe is accelerating. Exploding stars in distant galaxies appear fainter than they should have been in a steadily-expanding universe. Even the cosmic microwave background—the remnant light from the first clear moments in the universe’s history—shows fingerprints of dark energy’s effects. To explain the observed universe, dark energy is a necessary component of our mathematical models of cosmology.

[Related: Dark matter has never killed anyone, and scientists want to know why]

The term dark energy was coined in 1998 by astrophysicist Michael Turner to match the nomenclature of dark matter. It also conveys that the universe’s accelerating expansion was a crucial, unsolved problem. Many scientists at the time thought that Albert Einstein’s cosmological constant—a “fudge factor” he included in general relativity to make the math work out, also known as lambda—was the perfect explanation for dark energy, since it fit nicely into their models. 

“It was my belief that it was not that simple,” says Turner, now a visiting professor at UCLA. He views the accelerating universe as “the most profound problem” and “the biggest mystery in all of science.” 

Why does dark energy matter?

The Lambda-CDM model, which says we live in a universe that consists of only 5 percent normal matter—everything you’ve ever seen or touched—plus 27 percent dark matter and a whopping 68 percent dark energy, is “the current paradigm in cosmology, says Yale astrophysicist Will Tyndall. It “rather ambitiously seeks to incorporate (and explain) all of cosmic history,” he says. But it still leaves a lot unexplained, including the nature of dark energy. “After all, how can we have so little understanding of something that supposedly constitutes 68 percent of the universe we live in?” adds Tyndall. 

Dark energy is also a major deciding factor in our universe’s ultimate fate. Will the universe be torn apart in a Big Rip, in which everything is shredded apart atom by atom?  Or will it end in a whimper? 

These scenarios depend on whether dark energy changes with time. If dark energy is just the cosmological constant, with no variation, our universe will expand eternally into a very lonely place; in this scenario, all the stars beyond our local cluster of galaxies would be invisible to us, too red to be detected.

If dark energy gets stronger, it might lead to the  event known as the Big Rip. Maybe dark energy weakens, and our universe crunches back down, starting the cycle all over with a new big bang. Physicists won’t know which of these scenarios lies ahead until they have a better handle on the nature of dark energy.

What could dark energy actually be? 

Dark energy shows up in the mathematics of the universe as Einstein’s cosmological constant, but that doesn’t explain what physically causes the universe’s expansion to speed up. A leading theory is a funky feature of quantum mechanics known as the vacuum energy. This is created when pairs of particles and their antiparticles quickly pop into and out of existence, which happens pretty much everywhere all the time. 

It sounds like a great explanation for dark energy. But there’s one big issue: The value of the vacuum energy that scientists measure and the one they predict from theories are wildly and inexplicably different. This is known as the cosmological constant problem. Put another way, particle physicist’s models predict that what we think of as “nothing” should have some weight, Turner says. But measurements find it weighs very little, if anything at all. “Maybe nothing weighs nothing,” he says. 

[Related: An ambitious dark energy experiment just went live in Arizona]

Cosmologists have raised other explanations for dark energy over the years. One, string theory, claims that the universe is made up of tiny little string-like bits, and the value of dark energy that we see just happens to be one possibility within many different multiverses. Many physicists consider this to be pretty human-centric in its logic—we couldn’t exist in a universe with other values of the cosmological constant, so we ended up in this one, even if it’s an outlier compared to the others.

Other physicists have considered changing Einstein’s equations for general relativity altogether, but most of those attempts were ruled out by measurements from LIGO’s pioneering observations of gravitational waves. “In short, we need a brilliant new idea,” says Freese.

How might scientists solve this mystery?

New observations of the cosmos may be able to help astrophysicists measure the properties of dark energy in more detail. For example, astronomers already know the universe’s expansion is accelerating—but has that acceleration always been the same? If the answer to this question is no, then that means dark energy hasn’t been constant, and the lives of physics theorists everywhere will be upended as they scramble to find new explanations.

One project, known as the Dark Energy Spectroscopic Instrument or DESI, is already underway at Kitt Peak Observatory in Arizona. This effort searches for signs of varying acceleration in the universe by cosmic cartography. “It is like laying grid-paper over the universe and measuring how it has expanded and accelerated with time,” says Davis. 

Even more experiments are upcoming, such as the European Euclid mission launching this summer. Euclid will map galaxies as far as 10 billion light-years away—looking backward in time by 10 billion years. This is “the entire period over which dark energy played a significant role in accelerating the expansion of the universe,” as its mission website states. Radio telescopes such as CHIME will be mapping the universe in a slightly different way, tracing how hydrogen spreads across space.

New observations won’t solve everything, though. “Even if we measure the properties of dark energy to infinite precision, it doesn’t tell us what it is,” Davis adds. “The real breakthrough that is needed is a theoretical one.” Astronomers have a timeline for new experiments, which will keep marching forward, recording better and better measurements. But theoretical breakthroughs are unpredictable—it could take one, ten, or even a hundred-plus years. “In science, there are very few true puzzles. A true puzzle means you don’t really know the answer,” says Turner. “And I think dark energy is one of them.”

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On a clear, moonless night, you might be able to see thousands of stars sparkling like jewels above. But a keen eye will notice that they don’t all look alike. Some glow brighter than others, and some display warm red hues.

In the beginning…

All stars form from a cloud of dust and gas when turbulence pushes enough of that material together, pressed into one body by gravity. As that clump collapses in on itself, it starts to spin. The material in the middle heats up, forming a dense core known as a protostar. Gravity draws even more material toward the developing star as it spins, making it bigger and bigger. Some of that stuff may eventually form planets, asteroids, and comets in orbit around the new star.

The stellar body remains in the protostar phase as long as material still collapses inward and the object can grow. This process can take hundreds of thousands of years.

The amount of mass that is gathered during that stellar formation process determines the ultimate trajectory of the star’s life—and what types of stars it will become throughout its existence.

Protostars, baby stars—and failures

As a protostar amasses more and more gas and dust, its spinning core gets hotter and hotter. Once it accumulates enough mass and reaches millions of degrees, nuclear fusion begins in the core. A star is born.

For this to occur, a protostar has to accumulate more than 0.08 times the mass of our sun. Anything less and there won’t be enough gravitational pressure on the protostar to trigger nuclear fusion. 

Those failed stars are called brown dwarfs, and they remain in that state for their lifetime, progressively cooling down without nuclear fusion to help release new energy. Despite their name, brown dwarfs can be orange, red, or black due to their cool temperatures. They tend to be slightly larger than Jupiter, but are much more dense.

Protostars that do acquire enough mass to become a star sometimes go through an interim phase. During a roughly 10 million-year period, these young stars collapse under the pressure of gravity, which heats up their cores and sets off nuclear fusion. 

In this stage, a star can fall into two categories: If it has a mass two times that of our sun, it is considered a T Tauri star. If it has two to eight solar masses, it’s a Herbig Ae/Be star. The most massive stars skip this early stage, because they contract too quickly. 

Once a sufficiently massive star begins to undergo nuclear fusion, a balancing act begins. Gravity still exerts an inward force on the newborn star, but nuclear fusion releases outward energy. For as long as those forces balance each other out, the star exists in its main sequence stage. 

Fueling main sequence stars

Main sequence stars, which can last for millions to billions of years, are the vast majority of stars in the universe—and what we can see unaided on dark, clear nights. These stars burn hydrogen gas as fuel for nuclear fusion. Under the super-hot conditions in the core of a star, colliding hydrogen fuses, generating energy. This process produces the chemical ingredients for a reaction that makes helium. 

Mass dictates what type of star an object will be during the main sequence stage. The more mass a star has, the stronger the force of gravity pushing inward on the core and therefore the hotter the star gets. With more heat, there is faster fusion and that generates more outward pressure against the inward gravitational force. That makes the star appear brighter, bigger, hotter, and bluer.

[Related: The Milky Way’s oldest star is a white-hot pyre of dead planets]

Many main sequence stars are also often referred to as “dwarf” stars. They can range greatly in luminosity, color, and size, from a tenth to 200 times the sun’s mass. The biggest stars are blue stars, and they are particularly hot and bright. In the middle are yellow stars, which includes our sun. Somewhat smaller are orange stars, and the smallest, coolest stars are red stars. 

The hottest stars are O stars, with surface temperatures over 25,000 Kelvin. Then there are B stars (10,000 to 25,000K), A stars (7,500 to 10,000K), F stars (6,000 to 7,500K), G stars (5,000 to 6,000K—our sun, with a surface temperature around 5,800K is one of these), K stars (3,500 to 5,000K), and M stars (less than 3,500K). 

Upsetting the balance to grow a giant star

As a star runs out of fuel, its core contracts and heats up even more. This makes the remaining hydrogen fuse even faster: It produces extra energy, which radiates outward and pushes more forcefully against the inward force of gravity, causing the outer layers of the star to expand.

As those layers spread out, they cool down, and that makes the star appear redder. The result is either a red giant or a red supergiant, depending on if it’s a low mass star (less than 8 solar masses) or a high mass star (greater than 8 solar masses). This phase typically lasts up to around a billion years.

Appearing more orange than red, some red giants are visible to the naked eye, such as Gamma Crucis in the southern constellation Crux (aka the Southern Cross).

The death and afterlife of a low-mass star

Stars die in remarkably different ways, depending on their masses. For a low-mass star, once all the hydrogen is nearly gone, the core contracts even more, getting even hotter. It becomes so scorching that the star can even fuse helium—which, because it’s an element heavier than hydrogen, requires more heat and pressure for nuclear fusion. 

As a red giant burns through its helium, producing carbon and other elements, it becomes unstable and begins to pulsate. Its outer layers are ejected and blow away into the interstellar medium. Eventually, when all of these layers have been shed, all that remains is the small, hot, dense core. That bare remnant is called a white dwarf.

[Related: Wiggly space waves show neutron stars on the edge of becoming black holes]

About the size of Earth, though hundreds of thousands of times more massive, a white dwarf no longer produces new heat of its own. It gradually cools over billions of years, emitting light that appears anywhere from blue white to red. These dense stellar remnants are too dim to see with a naked eye, but some are visible with a telescope in the southern constellation Musca. Van Maanen’s star, in the northern constellation Pisces, is also a white dwarf. 

The explosive stellar death of a high-mass star

Stars with mass eight times that of our sun typically follow a similar pattern, at least in the beginning of this phase. As the star runs low on helium, it contracts and heats up, which allows it to convert the resulting carbon into oxygen. That process repeats itself with the oxygen, converting it to neon, then the neon into silicon, and finally into iron. When no fuel remains for this fusion sequence, and energy is no longer being released outward from those reactions, the inward force of gravity quickly wins. 

Within a second, the outer layers of the star collapse inward. The core collapses and then rebounds, sending a shock wave through the rest of the star: a supernova. 

Life after a supernova for a star takes one of two paths. If the star had between eight and 20 times the sun’s mass during its main sequence stage, it will leave behind a superdense core called a neutron star. Neutron stars are even smaller in diameter than white dwarfs, at about the size of New York City’s length, and contain more mass than our sun.

But for the most massive stars, that remnant core will continue collapsing under the pressure of its own gravity. The result is a black hole, which can be as small as an atom but contain the mass of a supermassive star.

One such example is a star in a binary or multi-star system that accretes mass from a companion. With all that extra mass to burn, it can seem younger than its true age, appearing bluer and brighter. That, Gosnell says, is called a blue straggler star, because it seems to be “straggling behind its expected evolution.” 

Another odd type of star is sub-subgiant, Gosnell says. These stars also are found in binary systems, and are transitioning from the main sequence to the red giant branch, though they stay dimmer. This kind of subgiant star has “really active magnetic fields with lots of star spots on the surface,” she says. “And so you have these really magnetically active, visually dynamic stars as the star spots rotate in and out of view.” 

The ongoing ESA mission, she adds, is reviewing stars with a “much finer-toothed comb”—which may reveal the true variety and complexity of stars that have existed all along. As such missions “peel back the layers,” Gosnell says, “We start to see really interesting stories come out that challenge the edges of these categories.”

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Venus is a searing inferno. Its surface temperatures are hot enough to melt lead. Its surface pressures, 75 times that of Earth at sea level, are enough to crush even the hardiest of metal objects. Sulfuric acid rain falls from noxious clouds in its atmosphere that choke out even the slightest glimpse of the sky.

In a typical infernal hellscape, you’d expect to find lava—but that element seems to be missing from Venus today. Astronomers are sure that our twin planet had volcanic activity in the past, but they’ve never agreed if volcanoes still erupt and reshape the Venusian surface as they do Earth’s.

Now, two planetary scientists may have found the first evidence of an active Venusian volcano hiding in 30-year-old radar scans from NASA’s Magellan spacecraft. Robert Herrick from the University of Alaska Fairbanks and Scott Hensley from NASA’s Jet Propulsion Laboratory published their breakthrough in the journal Science on March 15.  The new analysis has excited planetary scientists, many of whom are now waiting for future missions to carry on the volcano hunt.

“This [study] is the first-ever reported evidence for active volcanism on another planet,” says Darby Dyar, an astronomer at Mount Holyoke College in Massachusetts, who wasn’t an author on the paper.

The dense Venusian clouds would hide any volcanic activity from a spacecraft in orbit. Specially honed instruments can certainly delve under the clouds, but the planet’s capricious weather tends to make probes’ lives too short to fully explore the grounds. Of the Soviet Venera landers of the 1960s, 1970s, and 1980s, none survived longer than around two hours.

[Related: The hellish Venus surface in 5 vintage photos]

Magellan changed that. Launched in 1989 and equipped with the finest radar that the technology of its time could offer, Magellan mapped much of Venus to the resolution of a city block. In the probe’s charts, scientists found evidence of giant volcanoes, past lava flows, and lava-built domes—but no smoking gun (or smoking caldera) of live volcanic activity.

Before NASA crashed it into the Venusian atmosphere, Magellan made three different passes at mapping the planet between 1990 and 1993, covering a different chunk each time. In the process, the probe scanned about 40 percent of the planet more than once. If the Venusian terrain had shifted in the months between passes, scientists today might find it by comparing different radar images and spotting the difference.

But researchers in the early 1990s didn’t have the sophisticated software and image-analysis tools that their counterparts have today. If they wanted to compare Magellan’s maps then, they’d have had to do it manually, comparing printouts with the naked eye. So, Herrick and Hensley revisited Magellan’s data with more advanced computers. They found that in addition to blurriness, the probe often scanned the same feature from different angles, making it difficult to tell actual changes apart from, say, shadows.

“To detect changes on the surface, we need a pretty big event, something that disturbs roughly more than a square kilometer of area,” Hensley says.

Eventually, Herrick and Hensley found their smoking gun: a vent, just more than a mile wide, on a previously known mountain named Maat Mons. Between a Magellan radar image taken in February 1991 and another taken about eight months later, this vent appeared to have changed shape, with lava oozing out onto the nearby slopes.

To double-check, Herrick and Hensley constructed simulations of volcanic vents based on the shape of the feature that Magellan had spotted. Their results matched what Magellan saw: a potential volcano in the process of burping lava out onto Venus’s surface.

There is other evidence that backs up their radical results In 2012, ESA’s Venus Express mission spotted a spike in sulfur dioxide in the planet’s atmosphere, which some scientists ascribe to volcanic eruptions. In 2020, geologists identified 37 spots where magma plumes from the Venusian mantle might still touch its surface. But the evidence has so far been circumstantial, and astronomers have never actually seen a volcano in action on the “Morning Star.”

Fortunately for Venus enthusiasts, there might soon be heaps of fresh data to play with. The VERITAS space probe, part of NASA’s follow-up to Magellan, was originally scheduled for a 2028 launch, but is now pushed back to the early 2030s due to funding issues. When it does finally reach Venus, volcanoes will be near the top of its sightseeing list.

“We’ll be looking for [volcanoes] in two different ways,” says Dyar, who is also deputy principal investigator on VERITAS. The spacecraft will conduct multiple flybys to map the entire Venusian surface again, with radar that has 100 times the resolution of Magellan’s instruments (like zooming in from a city block to a single building). If there are volcanoes erupting across the planet, VERITAS might help scientists spot the changes that they etch into the landscape.

[Related: These scientists spent decades pushing NASA to go back to Venus]

Additionally, VERITAS will examine the Venusian atmosphere in search of fluids, which scientists call volatiles, that volcanoes belch out as they erupt. Water vapor, for example, is one of the most prominent volcanic volatiles. The phosphines that elicited whispers about life on Venus in 2020 also fall into this category of molecules. (Indeed, some experts tried to explain their presence via volcanoes).

VERITAS isn’t the only mission set to arrive at Earth’s infernal twin in the next decade. The European Space Agency’s EnVision—scheduled for a 2031 launch—will map the planet just like VERITAS, only with even higher resolution.

VERITAS and EnVision “will have far, far better capability to see changes with time in a variety of ways during their missions,” says Herrick, who is also involved with both missions. Not only will the two produce multiple higher-resolution scans for scientists to compare against each other, the results can also be corroborated with Magellan’s antique maps, which will be 40 years in the past by the time they arrive.

“When we get high-resolution imagery,” Dyar says, “I think that we’re going to find active volcanism all over Venus.”

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It costs a lot of money to get a satellite into orbit onboard a rocket—around $50 million minimum, to be more specific. While this massively restricts who can access the space industry, it’s not all bad.  According to NASA, there are approximately 27,000 hunks of space junk orbiting high above humans’ heads at the moment, with an average of 25 years before they fall from orbit and burn away upon atmospheric reentry.

Still, lowering costs while also shortening satellite lifespans is important if space exploration and utilization is to remain safe and viable. As luck would have it, a group of students and researchers at Brown University just made promising headway for both issues.

[Related: How harpoons, magnets, and ion blasts could help us clean up space junk.]

Last year, the team successfully launched their breadloaf-sized cube satellite (or cubesat) aboard a SpaceX Falcon 9 rocket for the comparatively low production cost of $10,000, with a dramatically shortened lifespan estimated at just five years. What’s more, much of the microsat was constructed using accessible, off-the-shelf components, such as a popular $20 microprocessor powered by 48 AA batteries. In total, SBUDNIC—a play on Sputnik as well as an acronym of the students’ names—is likely the first of its kind to be made almost entirely from materials not specifically designed for space travel.

Additionally, the group attached a 3D-printed drag sail made from Kapton film that unfurled once the cubesat reached orbit roughly 520 kilometers above Earth. Since tracking began in late May 2022, the students’ satellite has already lowered down to 470 kilometers—well below its fellow rocketmates aboard the Falcon 9, which remain around 500 kilometers high.

[Related: These 3D printed engines can power space-bound rockets—or hypersonic weapons.]

“The theory and physics of how this works has been pretty well accepted,” explained Rick Fleeter, an adjunct associate professor of engineering at Brown, in a statement. “What this mission showed was more about how you realize it—how you build a mechanism that does that, and how you do it so it’s lightweight, small and affordable.”

With SBUDNIC’s resounding success, researchers hope implementing similar drag-sail designs at scale for future satellites could help drastically reduce their lifespans, thus reducing space clutter to ensure a safer environment for fellow orbiters, both human and artificial. And if $10,000 is still a bit out of your price range—give the team some time. “Here, we’re opening up that possibility to more people…We’re not breaking down all the barriers, but you have to start somewhere,” said Fleeter.

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ON THE COLORADO PLAINS just below the Rocky Mountains, near the quaint town of Berthoud, lies the headquarters of a space company called Ursa Major. There, just about an hour’s drive north of Denver, the company regularly test-fires rocket engines straight out the back of an onsite bunker. 

These engines, which are mostly 3D printed, aren’t just for launching satellites into space: They’re also of interest to the US military for propelling hypersonic vehicles. And their dual-use nature is a modern manifestation of the two faces that rocket technology has always had, which is that it is simultaneously useful for defensive and offensive purposes, and for cosmic exploration.

With this technology in hand, the company hopes to get both civilian and military projects off the ground.

3… 2…1… liftoff

Joe Laurienti, who founded Ursa Major in 2015, grew up not too far from Berthoud. His father worked for Ball Aerospace—the cosmic arm of the company that makes a whole lot of aluminum cans, and the former owner of Ursa Major’s current 90-acre site. “He was always working on satellites,” says Laurienti. But when Laurienti went to see one of his father’s payloads launch, he thought, “The thing my dad worked on is really important. It’s on top of this rocket. But the fire coming out the bottom is way more exciting.”

Laurienti has been chasing that fire ever since, his life consumed by propulsion: the technology that makes rockets go up fast enough to counteract gravity and reach orbit. As an adult, he joined SpaceX’s propulsion team, then slipped over to Blue Origin—hitting two of the trifecta of space-launch companies owned by famous billionaires. (The third is Richard Branson’s Virgin Galactic.)

Soon, Laurienti saw others in the industry trying to start commercial rocket companies. He, perhaps biased, didn’t think that was a good idea: The heavy hitters that were founded first would obviously win, and the others would just be also-rans.

Nevertheless, he thought he had a startup to contribute to the mix: one that wouldn’t make entire rockets but just engines, to sell to rocket companies—much like General Electric makes engines that propel aircraft from Boeing or Airbus. “I spent my career on the engines, and that was always kind of a pain point” for the industry, says Laurienti.

Rocket engines, of course, are pretty important for heaving the space-bound vehicle upward. “A little over 50 percent of launch failures in the last 10 years are propulsion-related,” explains Bill Murray, Ursa’s vice president of engineering, who’s known Laurienti since they were both undergrads at the University of Southern California. You can take that to mean that half the complexity of a rocket exists inside the engines. Take that out of some rocket maker’s equation for them? Their job theoretically gets a lot easier.

“That’s the next wave of aerospace,” thought Laurienti. “It’s specialization.” 

With that idea, he sold his SpaceX stock in preparation for his new venture. “Instead of buying a house and starting a family, I bought a 3D printer, started the company, and made my mom cry,” he says.

3D printing engines—and entire rockets

The 3D printer was key to Laurienti’s vision. Today, 80 percent of a given Ursa engine is 3D printed with a metal alloy—and printed as a unit, rather than as separate spat-out elements welded together later. Most space companies use additive manufacturing (another way to refer to 3D printing) to some degree, but in general, they aren’t 3D printing the majority of their hardware. And they also aren’t, in general, designing their space toys to take advantage of 3D printing’s special traits, like making a complicated piece of hardware as one single part rather than hundreds.

That kind of mindset is also important at another company, Relativity Space, which has 3D printed basically an entire rocket—including the engines. Its Terran 1 rocket is the largest 3D printed object on Earth. The team attempted to launch the rocket on March 8 and 11, but it ultimately scrubbed the shots both times due to issues with ground equipment, fuel pressure, and automation systems.

Like Laurienti, Relativity founder Tim Ellis noticed a reluctance to fully embrace 3D printing tech at traditional space companies. At Blue Origin, his former employer, Ellis was the first person to do metal 3D printing; he was an intern desperate to finish creating a turbo pump assembly before his apprenticeship was over. Later, as a full employee, Ellis would go on to start and lead a metal 3D printing division at the company. 

But the way traditional space companies like Blue Origin usually do 3D printing didn’t work for him, because he felt that it didn’t always include designing parts to take advantage of additive manufacturing’s unique capabilities. “Every 3D printed part that Relativity has made would not be possible to build with traditional manufacturing,” says Ellis. The result of that approach has been “structures that ended up looking highly integrated, [because] so many parts of our rocket engine, for example, are built in single pieces.” Those one-part pieces would, in traditional manufacturing, have been made of up to thousands of individual pieces.

He thought more people would have come over to this side by now. “It’s been a lot slower than I’ve expected, honestly, to adopt 3D printing,” he says. “And I think it’s because it’s been slower for people to realize this is not just a manufacturing technology. It’s a new way to develop products.”

Five times the speed of sound

Initially, Ursa Major’s business model focused on space launch: getting things to orbit, a process powered by the company’s first engine, called Hadley. The design, currently still in production, slurps liquid oxygen and kerosene to produce 5,000 pounds of thrust. That’s about the same as the engines on Rocket Lab’s small Electron vehicle, or VirginOrbit’s LauncherOne spaceplane. 

But then an early customer—whose name Laurienti did not share—approached the company about a different application: hypersonics. These vehicles are designed to fly within Earth’s atmosphere at more than five times the speed of sound. Usually, when people discuss hypersonics, they’re talking about fast-moving, maneuverable weapons. 

“Hey, we were buying rocket engines from someone else, but they’re not really tailored for hypersonics,” Laurienti recalls this customer saying. “You’re [in] early development. Can you make some changes?” 

They could, although it wouldn’t be as easy as flipping a switch. Hypersonic vehicles often launch from the air—from the bottom of planes—whereas rockets typically shoot from the ground on their way to space. Hypersonics also remain within the atmosphere. That latter part is surprisingly hard, in the context of high speeds.  

Just like rubbing your hand on fabric warms both up, rubbing a hypersonic vehicle against the air raises the temperature of both. “The atmosphere around you is glowing red, trying to eat your vehicle,” says Laurienti. That heat, which creates a plasma around the craft, also makes it hard to send communications signals through. Sustaining high speeds and a working machine in that harsh environment remains a challenge.

But the company seems to have figured out how to make Hadley, which is now in its fourth iteration, work in the contexts of both launching a rocket to space and propelling a hypersonic vehicle that stays within Earth’s atmosphere. As part of one of Ursa Major’s contracts, the military wanted the engine to power an aircraft called the X-60A, a program run by the Air Force Research Lab. The X-60A was built as a system on which hypersonic technologies could fly, to test their mettle and give engineers a way to clock the weapons’ behavior.

Hypersonic weapons—fast, earthbound missiles—aren’t actually faster than intercontinental ballistic missiles (ICBMs), which carry nuclear warheads and arc up into space and then back down to their targets. But they’re of interest and concern to military types because they don’t have to follow trajectories as predictable as ICBMs do, meaning they’re harder to track and shoot down. Russia, China, India, France, Australia, Germany, Japan, both Koreas, and Iran all have hypersonic weapon research programs.

To intercept these fast-moving weapons, a country might need its own hypersonics, so there’s a defensive element and an offensive one. That’s partly why the Department of Defense has invested billions of dollars in hypersonics research, in addition to its desire to keep up with other countries’ technological abilities. That, of course, often makes other countries want to keep pace or get ahead, which can lead to everyone investing more money in the research.

A long-standing duality

Rocket technology, often touted as a way for humans to explore and dream grandly, has always had a military connection—not implicitly, but in a burning-bright obvious way. “[Nazi Germany’s] V-2 rocket was the progenitor to the intercontinental ballistic missiles,” says Lisa Ruth Rand, an assistant professor of history at Caltech, who focuses on space technologies and their afterlives.

Space-destined rockets were, at least at first, basically ballistic missiles. After all, a powerful stick of fire is a powerful stick of fire, no matter where it is intended to go. And that was true from the Space Age’s very beginning. “The R-7 rocket that launched Sputnik was one of the first operational ICBMs,” says Rand. The first American astronauts, she continues, shot to space on the tip of a modified Redstone ballistic missile. Then came Atlas rockets and Titan rockets, which even share the same names as the US missiles that were souped up to make them.

Rockets and flying weapons also share a kind of philosophical lineage, in terms of the subconscious meaning they impart on those who experience their fire. “They really shrunk the world, in a lot of ways, in time and space,” says Rand. “Accessing another part of the world, whether you were launching a weapon or a satellite, really made the world smaller.”

Today, in general, the development of missile technology has been decoupled from space-launch technology, as the rockets intended for orbit have been built specifically for that purpose. But it’s important not to forget where they came from. “They still all descend from the V-2 and from these military rockets,” says Rand. “And also most of them still launch DOD payloads.”

In a lot of ways, a 3D printed rocket engine that can both power a hypersonic vehicle and launch a satellite into orbit is the 21st-century manifestation of the duality that’s been there from the beginning. “Maybe it’s just saying the quiet part out loud,” says Rand. “What’s happening here—that was always kind of the case. But now we’re just making it very clear that, ‘Yeah, this has got to be used for both. We are building a company and this is our market and, yes, rockets are used for two main things: satellites and launching weapons.’”

‘A shock hitting your chest’ 

It’s no surprise that hypersonic capabilities have gotten their share of American hype—not all of it totally deserved. As defense researchers pointed out in Scientific American recently, the US has for decades put ballistic missiles on steerable maneuvering reentry vehicles, or MaRVs. Although they can only shift around toward the end of their flight, they can nonetheless change their path. Similarly, the scientists continued, while a lower-flying hypersonic might evade radar until it approaches, the US doesn’t totally rely on radar for missile defense: It also has infrared-seeking satellites that could expose a burning rocket engine like Hadley.

Still, the Air Force has been interested in what Ursa Major might be able to contribute to its hypersonic research, having funded seven programs with the company, according to the website USA Spending, which tracks federal contracts and awards. In fact, the Air Force is Ursa’s only listed government customer, having invested a few million in both the hypersonic and space-launch sides of the business. It’s also responsible for two of four of Relativity’s federal awards. 

Also of national security interest, of late, is decreasing the country’s reliance on Russian rocket engines for space launch. To that end, Ursa Major has a new engine, called Arroway, in development, which boasts 200,000 pounds of thrust. “Arroway engines will be one of very few commercially available engines that, when clustered together, can displace the Russian-made RD-180 and RD-181, which are no longer available to US launch companies,” the company said last June. It is also developing a third, in-between engine called Ripley, a scaled-up version of Hadley. 

Today, Ursa Major tests their 3D printed engines up to three times daily. On any given day, visitors in Berthoud might unknowingly be near six or nine high-powered experiments. When the static rocket engine begins its test, huge vapor clouds from the cryogenics can envelop an engineer. 

“When it lights, it’s just a shock hitting your chest,” says Laurienti. A cone of flames shoots from the back of the engine, toward a pile of sand in the field behind the bunker. Onlookers face the fire head-on, their backs to the mountains and their eyes on the prize.

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The suit was designed and built by Houston-based company Axiom Space, using some heritage NASA technology, plus a large glass fishbowl helmet and black outer cover with orange and blue highlights. During the livestream, an Axiom engineer walked out on the stage in the redesigned suit and demonstrated the enhanced mobility offered by new joints in the legs, arms, and gloves compared to the Apollo- and Space Shuttle-era suits, twisting, turning, and kneeling down with relative ease. The suits are also designed with modular components in a range of sizes to better fit astronauts of different body shapes and weights.

“We’re developing a spacesuit for a new generation, the Artemis generation, the generation that is going to take us back to the moon and onto Mars,” NASA Associate Administrator Bob Cabana said at the reveal. “When that first woman steps down on the surface of the moon on Artemis III, she’s going to be wearing an Axiom spacesuit.”

NASA had spent years developing its own next generation of spacesuits through its Exploration Extravehicular Mobility Unit (eXMU) program, but in June 2022, the space agency awarded contracts to both Axiom and Collins Aerospace to develop spacesuits for future missions. Unlike the getups still in use on the International Space Station, NASA will only lease the suits, according to Lara Kearney, manager for NASA’s Extravehicular Activity and Human Surface Mobility Program.

“Historically, NASA has owned spacesuits,” Kearney said at the event. The spacesuit contract with Axiom is more like the arrangement NASA makes with SpaceX for flying crew and cargo to the space station aboard Falcon 9 rockets and Dragon spacecraft; the company owns and operates the equipment, and the agency simply pays for services.

Financial arrangements aside, the new spacesuits include an array of improvements and advancements, many derived from NASA research and others unique to Axiom. The suit consists of an inner bladder layer that holds pressurized air in, covered by a restraint layer that holds the shape of the bladder layer, according to Axiom deputy program manager for Extravehicular Activity, Russel Ralston. An outer flight insulation layer provides “cut resistance, puncture resistance, thermal insulation, and a variety of other other other features,” he explained at the event, and consists of multiple layers of material, including aluminized mylar.

The more mobile joints, which will allow astronauts to better handle tools and maneuver around the rocky, heavily shadowed lunar South Pole, were developed at Axiom, Ralston said. Other features, such as the rigid upper torso of the suit—useful for attaching the life support system and tools—and a visor placed further back on the helmet to allow for more visibility, were initially conceived by NASA.

The design also features an entirely new cooling system compared to older suits, will carry a high-definition camera mounted on the helmet, and allows astronauts to enter and exit the suit through a hatch on the back rather than coming as separate lower and upper body segments, as with the current spacesuits.

Importantly, given NASA’s commitment to seeing a female astronaut lead the way back to the moon, the new suits are designed to fit a wide range of body sizes for across sexes, according to Ralston. “We have different sizes of elements that we can swap out—a medium, large and small if you will—for different components,” he said at the press conference. “Then within each of those sizes, we also have an adjustability to where we can really tailor the suit to someone: the length of their leg or the length of their arm.”

Axiom is continuing to build on the spacesuit ahead of the Artemis III mission, including an outer insulation layer that will include pockets and other attachments for tools, and which will be made in white to reflect the harsh sunlight on the moon. The the black, orange and blue cover seen today is just a temporary protective cover to prevent damage to the suit’s inner layers while testing, and, per an Axiom press release, hides “proprietary design” elements.

Despite all the technological advances compared to the Apollo spacesuits of the 1960s and ‘70s, some core technologies are immune to improvement. Asked about whether Axiom found a better way for astronauts to use the restroom while wearing the new shells for up to eight hours on the lunar surface, Ralson didn’t sugarcoat it.

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A new JWST infrared image, captured last summer but shared publicly this week, exposes some of the explosive details scientists have been looking for. The telescope used a spectrograph and two of its advanced cameras to record the halo of dust emanating from WR 124. The star is currently in the “Wolf-Rayet phase,” in which it loses much of its mass to surrounding space. The bright white spot at the center shows the burning stellar core; the pink and purple ripples represent a nebula of hydrogen and other ejecta.

Stars of a certain magnitude will go through the Wolf-Rayet transformation as their lifespan winds down. WR 124 is one of the mightiest stars in the Milky Way, with 3,000 percent more mass than our sun. But its end is nye—it will collapse into a supernova in a few hundred thousand years

[Related: This could be a brand new type of supernova]

In the meantime, astronomers will use images and other data from JWST to measure WR 124’s contribution to the universe’s “dust budget.” Dust is essential to the universe’s workings, as NASA explains. The stuff protects young stars and forms a foundation for essential molecules—and planets. But much more of it exists than we can account for, the space agency notes: “The universe is operating with a dust budget surplus.”

The spectacular cloud around WR 124 might explain why that is. “Before Webb, dust-loving astronomers simply did not have enough detailed information to explore questions of dust production in environments like WR 124, and whether the dust grains were large and bountiful enough to survive the supernova and become a significant contribution to the overall dust budget. Now those questions can be investigated with real data,” NASA shared.

As JWST enters its second year of exploration, the observatory will take a sweeping look at galaxies far and near to reconstruct a timeline of the early universe. But individual stars can add to that cosmological understanding, too, even if they aren’t all on a glorious death march like WR 124.

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What happens when a dart hits the bullseye? In a game among amateurs, it sends everybody home. But professional players will want to analyze the shot in preparation to fire again. 

In this case, that dart is NASA’s Double Asteroid Redirection Test (DART), the spacecraft that crashed last November into the asteroid Dimorphos in hopes of redirecting its course. On March 2, a quintet of papers in the journal Nature confirmed what DART’s controllers had already guessed: The mission’s impact was a smashing success.

But DART won’t be the last human mission to visit Dimorphos or the larger asteroid which it orbits, Didymos. The European Space Agency’s Hera will soon follow in DART’s trail to appraise its aftermath—in far more detail than scientists, with their combination of instruments from Earth and the DART mission’s own sensors, have managed so far.

Now scheduled for an October 2024 departure, Hera is slated to lift off from Cape Canaveral on the wings of a SpaceX Falcon 9 rocket. According to the mission’s current itinerary, it will arrive at Dimorphos and Didymos in late 2026 for around six months of sightseeing. Then, if conditions allow, Hera—a car–sized probe outfitted with a large radio antenna and a pair of solar panels—will try to make a full landing on Didymos.

Hera will also carry two passengers: a pair of CubeSats named Milani and Juventas. Milani will study the asteroids’ exteriors; Juventas will probe the asteroids’ interiors. With three spacecraft, scientists can get three different views of the crash site on Dimorphos. The mission’s chief purpose is to follow in DART’s shadow and understand what damage humanity’s first asteroid strike actually left on its target.

[Related: NASA has major plans for asteroids. Could Psyche’s delay change them?]

Between DART’s now-destroyed cameras, its companion LICIACube, and telescopes watching from Earth’s ground and orbit, we already know quite a bit about the planetary defense test. We can see Dimorphos’ orbit, both before and after DART’s impact; we know that DART altered it, cutting Dimorphos closer to Didymos and shortening its orbital period; and we can home in on where on the asteroid’s surface that DART struck, down to a patch the size of a vending machine.

But there’s still a lot we don’t know—most critically, Dimorphos’s mass before and after it was infiltrated. Scientists can’t calculate the measurement from Earth, but Hera’s instruments will have that ability. Without knowing the mass, we have no way of knowing why, precisely, DART’s impact pushed Dimorphos into its new orbit.

“We want to determine, accurately, how much momentum was transferred to Dimorphos,” says Patrick Michel, astronomer at the Côte d’Azur Observatory in France and Hera’s mission principal investigator.

Hera might also tell us what cosmetic scars DART left from the crash. It’s possible that the impactor simply left a crater, or that it violently shook up the asteroid, rearranging a large chunk of its exterior. “A lot of us are wondering how much of the surface we’ll even be able to recognize,” says Andy Cheng, an astronomer at the Johns Hopkins Applied Physics Laboratory who worked on DART.

The problem is that, until humans send an observer to the asteroid, we don’t know what the surface holds in wait for us, Michel says. What the asteroid’s exterior looks like now depends on what Dimorphos’s interior looked like when DART struck it. If the spacecraft dramatically reshaped the asteroid, it’s a sign that the target’s insides were weakly held together. And right now, “we have no clue, really, what’s happening inside,” says Terik Daly, an astronomer at the Johns Hopkins Advanced Physics Laboratory and DART team member. Hera, along with the radar-packing Juventas, will try to scan below the rocky surface.

Of course, Hera won’t be able to observe everything. Many astronomers have focused on Dimorphos’s ejecta—the material kicked up from the asteroid upon DART’s impact—to understand how exactly the strike nudged the asteroid. By the time of Hera’s arrival, at least four years after the crash, most of that ejecta will have long dissipated.

Still, knowing more about the asteroid’s innards can help astronomers understand where that ejecta came from—and what would happen if we crossed paths with a space rock again. “For example, in the future, if we had to use this technique to divert some asteroid, then we could do a more precise prediction [to hit it],” says Jian-Yang Li, an astronomer at Pennsylvania State University who worked on DART.

There are also other reasons why Dimorphos might not look the same way in 2026. Just as the moon pulls and pushes the tides around Earth’s oceans, Didymos’ gravity might play with its smaller companion. Scientists think it’s possible that those forces might cause Dimorphos to wobble in its orbit. But again, they won’t be able to observe any of this until Hera actually gets up close.

As the mission progresses, they might at least be able to set a baseline. Michel says that astronomers on Earth can simulate many of Dimorphos’s possible future orbits on their computers. “It’s not really a problem that we arrive four years later,” says Michel. “We have the tools to understand if something evolved.”

[Related: This speedy space rock is the fastest asteroid in our solar system]

The data from DART’s impact and Hera’s eyes certainly will help astronomers understand asteroids in their pre- and post-collision states. But they’ll also help us prevent the specter of death from above. Humans have long feared destruction from space in line with the dinosaurs, and with DART, planetary defense—the science of stemming that fear—made its first step into real-world strategies. 

It’s hard to say when we’ll need the ability to deflect a space rock; astronomers’ projections show that no object larger than a kilometer is set to pass Earth in the next century. But, according to Michel, space agencies haven’t identified 60 percent of the objects flying by that are at least 40 meters long—large enough to devastate a region or a small country.

“We know that, eventually, such an impact [with Earth] will happen again,” Michel says, “and we cannot improvise.”

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This article was originally featured on Hakai Magazine, an online publication about science and society in coastal ecosystems. Read more stories like this at hakaimagazine.com.

Camilla Rathsach walked along the lichen-covered sand, heading out from the lone village on Denmark’s remote Anholt island—a spot of land just a few kilometers wide in the middle of the Kattegat Strait, which separates the Danish mainland from Sweden. As Anholt Town’s 45 streetlights receded into the distance, moonlit shadows reached out to embrace the dunes. Rathsach looked up, admiring the Milky Way stretching across the sky. Thousands of stars shone down. “It’s just amazing,” she says. “Your senses heighten and you hear the water and feel the fresh air.”

This dark-sky moment was one of many Rathsach experienced while visiting the island in 2020 for work on her master’s thesis on balancing the need for outdoor lighting and darkness. Having grown up in urban areas, Rathsach wasn’t used to how bright moonlit nights could be. And after speaking with the island’s residents, who value the dark sky deeply and navigate with little outdoor light, she realized that artificial lighting could be turned down at night depending on the moon’s phase.

At Aalborg University in Denmark, she worked with her graduate supervisor, Mette Hvass, to present a new outdoor lighting design for Anholt’s church. Rathsach and Hvass picked the church for their project because it is a central meeting place for the community yet it currently has no outdoor lights. They thought lighting would make it easier for people to navigate but wanted to preserve the inviting ambiance of moonlight.

One of the guiding principles of designing sustainable lighting is to start with darkness, and add only the minimum amount of light required. Darkness and natural light sources are important to many species, and artificial light can be downright dangerous.

“Lights can attract and disorient seabirds during their flights between colony and foraging sites at sea,” says Elena Maggi, an ecologist at the University of Pisa in Italy who is not involved in the project. Anholt’s beaches host a variety of breeding seabirds, including gulls and terns, and the island is a stopover for many migrating birds. The waters around the island are also home to seals, cod, herring, and seagrass. Though scientists have made progress in understanding the effects of artificial light at night on a range of species, such as turtles, birds, and even corals, there is still more to learn.

“We still don’t know exactly how artificial light might interact with other disturbances like noise and chemical pollution, or with rising ocean temperatures and acidification due to climate change,” says Maggi.

The scientists’ final design for the church includes path lighting and small spotlights under the window arches, along with facade lighting under the eaves shining downward. To preserve the dark sky, path lighting would turn off on bright moonlit nights, and facade lighting would shut off on semi-bright or bright nights. The window lighting would stay on regardless of the moon’s phase.

The adaptive lighting cooked up by Camilla Rathsach and Mette Hvass would automatically adjust to the availability of moonlight, tweaking this church’s lighting automatically to balance visibility and darkness. Mock-ups show how the church would be lit under no moonlight (first) and a full moon (second). Illustrations courtesy of Camilla Rathsach

“The contrast between the moon’s cold white light reflecting off the church’s walls and the warm orange lights in the windows would create a cozy, inviting experience,” says Rathsach.

The moonlight adaptive lighting design project is part of a growing effort to balance the need for functional lighting in the town and to protect the darkness. Recently, the town’s public streetlights were swapped for dark-sky friendly lamps, says Anne Dixgaard, chairman of Dark Sky Anholt.

Dixgaard also organizes a yearly walk out to Anholt’s beach, where skywatchers can learn about the night sky. “People really value Anholt’s dark sky and want to preserve it,” she says.

Rathsach and Hvass are working on the moonlight adaptive design project in hopes that it will be implemented one day, but they still have some challenges to overcome. Moonlight is a relatively faint light source, so detecting it using sensors is challenging, and lights would need to adjust automatically on nights with intermittent cloud cover. Yet big initiatives often begin with small steps.

“This work is something new and unexpected,” says Maggi. “It’s a very interesting approach to mitigating the negative effects of artificial light at night.”

This article first appeared in Hakai Magazine and is republished here with permission.

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Water is an essential ingredient for life as we know it, but its origins on Earth, or any other planet, have been a long-standing puzzle. Was most of our planet’s water incorporated in the early Earth as it coalesced out of the material orbiting the young sun? Or was water brought to the surface only later by comet and asteroid bombardments? And where did that water come from originally? 

A study published on March 7 in the journal Nature provides new evidence to bolster a theory about the ultimate origins of water—namely, that it predates the sun and solar system, forming slowly over time in vast clouds of gas and dust between stars.

”We now have a clear link in the evolution of water. It actually seems to be directly inherited, all the way back from the cold interstellar medium before a star ever formed,” says John Tobin, an astronomer studying star formation at the National Radio Astronomy Observatory and lead author of the paper. The water, unchanged, was incorporated from the protoplanetary disk, a dense, round layer of dust and gas that forms in orbit around newborn stars and from which planets and small space bodies like comets emerge. Tobin says the water gets drawn into comets “relatively unchanged as well.”

Astronomers have proposed different origins story for water in solar systems. In the hot nebular theory, Tobin says, the heat in a protoplanetary disk around a natal star will break down water and other molecules, which form afresh as things start to cool.  

The problem with that theory, according to Tobin, is that when water emerges at relatively warm temperatures in a protoplanetary disk, it won’t look like the water found on comets and asteroids. We know what those molecules look like: Space rocks, such as asteroids and comets act as time capsules, preserving the state of matter in the early solar system. Specifically, water made in the disk wouldn’t have enough deuterium—the hydrogen isotope that contains one neutron and one proton in its nucleus, rather than a single proton as in typical hydrogen. 

[Related: Meteorites older than the solar system contain key ingredients for life]

An alternative to the hot nebular theory is that water forms at cold temperatures on the surface of dust grains in vast clouds in the interstellar medium. This deep chill changes the dynamics of water formation, so that more deuterium is incorporated in place of typical hydrogen atoms in H₂O molecules, more closely resembling the hydrogen-to-deuterium ratio seen in asteroids and comets.  

“The surface of dust grains is the only place where you can efficiently form large amounts of water with deuterium in it,” Tobin says. “The other routes of forming water with deuterium and gas just don’t work.” 

While this explanation worked in theory, the new paper is the first time scientists have found evidence that water from the interstellar medium can survive the intense heat during the formation of a protoplanetary disk. 

The researchers used the European Southern Observatory’s Atacama Large Millimeter/submillimeter Array, a radio telescope in Chile, to observe the protoplanetary disk around the young star V883 Orionis, about 1,300 light-years away from Earth in the constellation Orion. 

Radio telescopes such as this one can detect the signal of water molecules in the gas phase. But dense dust found in  protoplanetary disks very close to young stars often turns water into ice, which sticks to grains in ways telescopes cannot observe. 

But V883 Orionis is not a typical young star—it’s been shining brighter than normal due to material from the protoplanetary disk falling onto the star. This increased intensity warmed ice on dust grains farther out than usual, allowing Tobin and his colleagues to detect the signal of deuterium-enriched water in the disk. 

“That’s why it was unique to be able to observe this particular system, and get a direct confirmation of the water composition,” Tobin explains. ”That signature of that level of deuterium gives you your smoking gun.” This suggests Earth’s oceans and rivers are, at a molecular level, older than the sun itself. 

[Related: Here’s how life on Earth might have formed out of thin air and water]

“We obviously will want to do this for more systems to make sure this wasn’t just that wasn’t just a fluke,” Tobin adds. It’s possible, for instance, that water chemistry is somehow altered later in the development of planets, comets, and asteroids, as they smash together in a protoplanetary disk. 

But as an astronomer studying star formation, Tobin already has some follow up candidates in mind. “There are several other good candidates that are in the Orion star-forming region,” he says. “You just need to find something that has a disk around it.”

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NASA’s Curiosity rover snapped a sunset picture that would make any influencer jealous. The car-sized Martian explorer captured a dazzling sunset on the Red Planet at the start of its new cloud-imaging campaign that began in January.

The image, taken on February 2, shows rays of light illuminating a bank of clouds. These rays are called crepuscular rays, derived from the Latin word for “twilight.” According to NASA, it is the first time that the sun’s rays have been so clearly viewed on Mars. 

[Related: What is a ‘Martian flower’?]

Curiosity’s newest twilight cloud survey is building upon observations published in May 2021 that showed night-shining (aka noctilucent) clouds. Martian clouds are mostly made out of water and ice and hover no more than 37 miles above the ground, but the clouds in this new image appear to be higher where it is especially cold. NASA says that their position suggests that the noctilucent clouds are made of carbon dioxide ice, or dry ice.

The 2021 cloud survey also included some imaging made by Curiosity’s black-and-white navigation cameras, giving astronomers a detailed look at how the structure of clouds on Mars move. This new survey will wrap up in mid-March and relies on the color Mast Camera–or Mastcam– that will help scientists see how cloud particles grow.

Curiosity also captured a set of colorful clouds on January 27. These feather-shaped clouds create a rainbow-esque display called iridescence when the sun illuminates them. 

“Where we see iridescence, it means a cloud’s particle sizes are identical to their neighbors in each part of the cloud,” said Mark Lemmon, an atmospheric scientist with the Space Science Institute in Boulder, Colorado, in a statement. “By looking at color transitions, we’re seeing particle size changing across the cloud. That tells us about the way the cloud is evolving and how its particles are changing size over time.”

[Related: Curiosity found a new organic molecule on Mars.]

The iridescent clouds and sun rays were both captured as panoramas stitched together from 28 images sent back to Earth. The images have been processed to emphasize the highlights of the images.

Curiosity is the largest and most capable rover that NASA has ever sent to Mars. It launched on November 26, 2011 and landed on the Red Plant on August 5, 2012. Since then, it has snapped the first ever panoramic image of Mars, explored the planet’s Gale Crater and picked up samples of rock, soil, and air samples for onboard analysis. In 2022, the rover even found carbon that could have come from volcanoes or even past lifeforms.

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Star Trek fans knew they would lose the planet Vulcan someday in a fiery implosion at the hands of the Romulans—but they probably didn’t expect it to lose the planet in real life, too. Now reality is once again following fiction: The exoplanet once considered to be the real Vulcan has been erased, based on a new analysis of old data.

The 2018 discovery of the exoplanet known as 40 Eri b, which is located around the real-life star canonically orbited by Spock’s fictional homeworld, has turned out to be a false alarm. In a new research paper accepted for publication in the Astronomical Journal, astronomers used years of observations to re-analyze many previous exoplanet detections, including that of 40 Eri b. Unfortunately, astronomers hadn’t actually found Vulcan after all.

“As we continue to study objects with better and more precise instruments, reevaluating things we thought we already knew can lead to new conclusions about what’s really going on,” says Ohio State University astronomer Katherine Laliotis, lead author on the new work. In the case of 40 Eri b, the signal previously thought to be a planet turned out to be activity on the star’s surface. This work, she adds, is “a reminder that re-studying and reproducing already published results is a very valuable use of time.”

40 Eri b was originally detected using the radial velocity method, in which astronomers analyze the different wavelengths of light coming from a star. As a planet orbits a star, it’ll tug on its sun ever so slightly. When this tug pushes the star away from Earth, the star appears redder—thanks to the Doppler effect—and if it moves toward us, it appears bluer. With this method, astronomers believed they found 40 Eri b: A Neptune-sized planet 16 light-years away, so close to its star that a year would last only 42 days. This wouldn’t have been a particularly pleasant or habitable planet, but it made waves thanks to its sci-fi ties.

[Related: Newly discovered exoplanet may be a ‘Super Earth’ covered in water]

Some astronomers, such as NASA astronomer Eric Mamajek, immediately expressed doubts about the supposed detection. That’s because the time it took for this planet to complete one orbit was suspiciously close to the time the star takes to rotate. His suspicions were right. By tracing a feature of the light spectrum known to be part of the star, Laliotis and collaborators confirmed the star’s rotation rate, marking the end of the possible planet 40 Eri b. 

They didn’t specifically set out on a mission to kill Vulcan, though. This work was part of a bigger analysis, looking into all of NASA’s top picks for future exoplanet exploration—and 40 Eridani just happened to be on the list. Astronomers are always collecting new data, observing different stars, but “​​many planetary systems haven’t been officially updated since they were published in the early 2000s,” according to Laliotis.

Astronomers are already starting preparation for the next big space telescope, known as the Habitable Worlds Observatory. This future NASA mission aims to take photos of Earth-like planets around sun-like stars, allowing scientists to directly look into these exoplanets’ atmospheres for oxygen and other signs of life. Laliotis’s work fits right into this plan—she says this study aimed to figure out “what [planetary] systems we already understand well, what systems we have a misunderstanding of, and what systems need to be observed a lot more in the coming years.” This review will help make sure the future telescope’s precious observing time is used wisely.

“NASA is planning to spend billions of dollars on future missions to fly telescopes to study planets,” says Jessie Christiansen, project scientist at NASA’s Exoplanet Archive. “Imagine if this had been one of the targets! It’s not real!”

Although astronomers are, of course, glad to see rigorous scientific work being done, they’ll also admit that they are a bit sad about losing an exoplanet with such a cool sci-fi crossover. “I’m sad whenever any planet gets disproven, but this one hit especially hard because I’ve been using it for a few years now as a provocative, intriguing tie between the real worlds we’re discovering and the fictional worlds we know and love,” says Christiansen, who also started a lively Twitter conversation on the topic.

[Related: In a first, James Webb Space Telescope reveals distant gassy atmosphere is filled with carbon dioxide]

This doesn’t completely rule out a real-world equivalent of Vulcan, though. The Neptune-sized planet discovered in 2018 isn’t there, but it’s possible a smaller planet—one we haven’t seen yet—still exists around the star 40 Eridani. With current technology and observations, astronomers simply can’t detect any planet smaller than 12 times Earth’s mass on an orbit similar to Earth’s. “This means there’s still a chance that Vulcan exists. In fact, there’s even a chance that Vulcan could be in the habitable zone for the star,” says Laliotis.

Even if Vulcan is gone for now, Trekkie astronomers will still find ways to have fun with sci-fi and outer space. “There are still many other planets in the Star Trek universe that haven’t been disproven,” adds Louisiana State University astronomer Alison Crisp. One potential planet orbiting Wolf 359, for example, could still exist—the site of a major Star Trek battle. 

UCLA astronomer Isabella Trierweiler actually sees a way this saga fits into Star Trek canon. “Until 2063, Vulcans are just observing Earth and waiting for us to develop warp capabilities,” Trierweiler says. “Maybe they were able to adjust our observations to hide the planet, maybe they found super strong cloaking devices, or maybe Vulcan was briefly one of those planets that phases in and out of dimensions!” Whatever Vulcan’s fate, humanity has a few more years of technological development ahead of us until we reach these sci-fi dreams. And perhaps those lofty goals will help us find a real planet around 40 Eridani.

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With over 144,370,000 square miles of surface terrain, Mars has a lot of places where signs of potential life could hide. Factor in the ultra-valuable time of current and future rovers, and it makes it even more challenging to scour for evidence of potential ancient microbes and organisms in an efficient way. To even the playing field a bit, SETI is turning again to artificial intelligence and machine learning in an effort to calculate the most likely and promising places for rovers—and, perhaps one day, astronauts—to look for clues of life. And as first detailed on Monday in Nature Astronomy, the team’s new AI machine learning modeling is already showing potential to speed up humanity’s search for alien life.

[Related: Want to travel to Mars? Here’s how long the trip could take.]

To build their AI, the interdisciplinary project led by SETI Institute Senior Research Scientist Kim Warren-Rhodes trained a program on datasets drawn from a region called Salar de Pajonales. Located at the border of Chile’s Atacama Desert and Altiplano, Pajonales served as a decent stand-in for Mars, with its high altitude, arid climate, dry salt lakebed, high amounts of ultraviolet light, and sparse, photosynthetic microbial life. The team amassed over 7,765 images and 1,154 samples of the area’s rocks, crystals, and salt domes, then used the information alongside other datasets to teach their program to understand and detect areas featuring small biosignatures. Upon turning the AI/ML program towards a new nearby area, the system managed to locate similar biosignatures nearly 88 percent of the time, versus less than 10 percent for previous random searches. The new method also decreased necessary search areas up to 97 percent.

In a statement, Rhodes explained that, “Our framework allows us to combine the power of statistical ecology with machine learning to discover and predict the patterns and rules by which nature survives and distributes itself in the harshest landscapes on Earth.” They went on to express their hope that other astrobiologists will adapt the approach to mapping other environments, as well as to detect additional biosignatures. “With these models, we can design tailor-made roadmaps and algorithms to guide rovers to places with the highest probability of harboring past or present life—no matter how hidden or rare,” she said.

[Related: Signs of past chemical reactions detected on Mars.]

“While the high-rate of biosignature detection is a central result of this study, no less important is that it successfully integrated datasets at vastly different resolutions from orbit to the ground, and finally tied regional orbital data with microbial habitats,” said another team member, Nathalie A. Cabrol. 
Over time, the team hopes they and other astrobiologist groups can continue to build collaborative datasets that could aid in the search for alien life via onboarding them to future planetary rovers.

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On September 26, 2022, NASA’s Double Asteroid Redirection Test (DART) spacecraft slammed into the asteroid moonlet Dimorphos at 13,000 miles per hour, altering the extraterrestrial rock’s orbit around its larger companion asteroid, Didymos. A triumphant success of planning, targeting and autonomous flight that covered 7 million miles, the impact served as the first proof of concept for kinetic impactors—spacecraft that could be used to redirect any future asteroids on a collision course with Earth.

But to understand how a DART-like mission would work in a real apocalyptic scenario, astronomers and national security experts need lots of data and detailed analysis. Data they had almost immediately, as just about every telescope and sensor that could be trained on Dimorphos, was, prior to impact. And now, detailed analyses of what happened are going public, starting with five papers published in the journal Nature on March 1.

1. Kinetic impactors like DART can make a real splash

In a study of Dimophos’s orbit led by Northern Arizona University Astronomer Cristina Thomas, an international team calculated just how much DART’s crash landing changed the asteroid’s orbital period. Using radar and light curves, measured from changes in Dimorphos’s brightness over time, they showed the space rock slowed down in its orbit by 33 minutes, give or take about three minutes.

“To serve as a proof-of-concept for the kinetic impactor technique of planetary defense, DART needed to demonstrate that an asteroid could be targeted during a high-speed encounter and that the target’s orbit could be changed,” Thomas and her colleagues write in the paper. “DART has successfully done both.”

The researchers note, however, that there were probably several reasons why DART was able to slow Dimorphos down by a full half hour. If the only factor were the spacecraft’s mass, the asteroid’s orbit should have changed by no more than seven minutes. Any other explanations would “require modeling beyond the scope of this paper,” they explained.

2. DART got a big assist from the asteroid itself

A second paper led by Andy Cheng, chief scientist for planetary defense and the Johns Hopkins Applied Physics Laboratory, dug into why Dimorphos’s orbit shifted so dramatically.

His team’s research found that the “ejecta,” the material shaken loose from Dimorphos by the force of DART’s impact, amplified the transfer of kinetic energy from the spacecraft and the change in the asteroid’s orbit by 2.2 to 4.9 times. In fact, the authors write in the paper, “significantly more momentum was transferred to Dimorphos” from the escaping ejecta than DART itself.

[Related: NASA sampled a ‘fluffy’ asteroid that could hold clues to our existence]

Determining how much momentum a spacecraft can transfer to an asteroid and how that affects the asteroid’s orbit were key questions the DART mission sought to answer, and this study gives scientists the parameters they were waiting for. It illustrates the range of effectiveness kinetic impactors might have on hazardous asteroids given their makeup. Asteroids that respond to a strike with more ejecta may allow a DART-type spacecraft to deflect larger asteroids than it could otherwise, or to deflect an asteroid with less warning time.

3. Planning ahead is key to saving the planet

The key takeaway of the third paper, led by Terik Daly, Carolyn Ernst, and Olivier Barnouin of the Johns Hopkins Applied Physics Laboratory, is that despite DART’s successful strike and the helpful amplification by the impact ejecta, planetary protection remains a game of observation and early warning. “Kinetic impactor technology for asteroid deflection requires having sufficient warning time—at least several years but preferably decades—to prevent an asteroid impact with the Earth,” the researchers write in the paper.

Early warning, thankfully, is something NASA has been investing in since long before the DART mission. The NASA Authorization Act of 2005 directed the space agency to catalog 90 percent of all near-Earth asteroids of 460 feet in diameter or greater, a task that is now complete. NASA is now building an infrared space telescope scheduled for launch in 2028 that will help scan the skies for unseen asteroids.

“NEO Surveyor represents the next generation for NASA’s ability to quickly detect, track, and characterize potentially hazardous near-Earth objects,” Lindley Johnson, NASA’s planetary protection officer, said in a statement.

4. DART was also secretly a planetary-science mission

Dimorphos’s ejecta not only affected the orbit of the asteroid, they gave it a dust tail that strutted more than 900 miles from the asteroid within three hours of the impact, according to a fourth study led Jian-Yang Li, a senior scientist at the Planetary Science Institute.

Thought comets are better known for their brilliant tails, asteroids can also become “active,” as scientists put it, and form a little train on their backsides. It’s thought that this happens after some kind of impact, though the idea has never been put to the test. 

The September mission gave scientists a “detailed characterization” of the ejecta-to-tail-making process serving double duty as a planetary-protection and a planetary-science mission. “DART will continue to be the model for studies of newly discovered asteroids that show activity caused by natural impacts,” the researchers write.

5. DART really lit Dimorphos up

The last paper also falls into the planetary-science bucket with a close look at Dimorphos in its post-DART hangover. A study with ground-based telescopes in Africa and an Indian Ocean island led by SETI Institute astronomer Ariel Graykowski found it took the asteroid more than 23 days to return to its pre-impact levels of brightness in the night sky.

The analysis also found that ejecta appeared reddish at the time of impact, which is somewhat mysterious. “Typically, active bodies appear bluer in color on average than their inactive counterparts,” the researchers write in the paper, giving the examples of active comets versus inactive Kuiper Belt objects. “Some of these redder observed surface colors may be due to irradiation of organics,” they add, noting that lab experiments have shown space radiation can cause redden some of the same minerals probably found in asteroids like Dimorphos.

[Related: ‘Phantom’ mannequins will help us understand how cosmic radiation affects female bodies in space]

The five studies are just the first wave of an ongoing campaign to analyze the DART mission from different angles. The European Space Agency’s HERA mission, for instance, will rendezvous with Dimorphos sometime in 2026 to better assess the aftermath of DART’s impact in detail. Until then, NASA and other collaborators can continue to celebrate a major milestone in humanity’s relationship with the space around us.

“I cheered when DART slammed head on into the asteroid for the world’s first planetary defense technology demonstration, and that was just the start,” NASA administrator for its Science Mission Directorate, Nicola Fox, said in a statement on March 1. ”These findings add to our fundamental understanding of asteroids and build a foundation for how humanity can defend Earth.”

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Moon dust is the absolute worst. Not only does electrostatics cause it to cling to virtually everything, but it also has the consistency and feel of finely ground fiberglass. It was a genuine problem for the six Apollo crews who visited the moon’s surface—the silica particles covered their suits, worked their way into engines and electronics, and even ruined a few of their extremely expensive spacesuits. What’s more, many suffered from “lunar hay fever” upon return, leading many to worry that future astronauts on prolonged moon visits could develop symptoms similar to Black Lung Disease, along other issues including “DNA degradation.”

These are all serious issues to consider ahead of NASA’s planned return to the moon’s surface in 2025, but a team of college undergraduates at Washington State University just developed an ingenious solution to pesky moon dust dilemmas—blasting the residue with liquid nitrogen.

[Related: NASA’s Artemis I mission returns successfully.]

According to their findings recently published in the journal Acta Astronautica, the team developed a new spray that takes advantage of the Leidenfrost effect. Named after the its discoverer—the 18th-century German theologian and doctor, Johann Gottlob Leidenfrost—the process occurs when a liquid comes into close contact with a significantly hotter surface, causing it to quickly form a protective layer of vapor that briefly keeps it from evaporating, such as when water forms into droplets and runs across a very hot frying pan.

The same principle works similarly in space. In this case, a liquid nitrogen spray (typically around -320F) comes into contact with a surface’s relatively warmer lunar dust coating, causing the particles to bead and float away on the nitrogen vapors.

To test their concoction, the research team first dressed a Barbie doll wrapped with a material used to make space suits. They then hosed it down with liquid nitrogen in a normal atmospheric condition as well as a vacuum chamber similar to conditions in outer space. Not only did the liquid nitrogen spray perform better in the latter scenario, but it also resulted in minimal damage to the spacesuit material. In past lunar missions, astronauts’ specialized brush for the moon dust task often caused damage after a single use. In comparison, the liquid nitrogen spray took 75 uses before similar issues occurred.

[Related: March skies will bring a lunar illusion and a planetary reunion.]

Going forward, the team hopes to further research the intricacies that make their cleaning process so effective, as well as secure funding to construct testing chambers more closely resembling the lunar surface’s gravity. With any luck, maybe a can of their Moon-be-Gone will be aboard a future Artemis mission, ready to help astronauts avoid one of the lunar surface’s less awe-inspiring traits.

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The fabric of space and time is wrinkly and warped. Gravity tugs on this fabric, causing indents and wiggles—some of which are observable to humans as gravitational waves. When two black holes, neutron stars, or other extremely massive objects smash into each other, they emit these waves, which were first heard by the revolutionary LIGO experiment in 2016.

After that first detection seven years ago, physicists thought their mathematical models described the data well enough. Now, physicists have just determined that gravitational waves released from collisions between two black holes are more complex than previously thought. Two new studies from Caltech and Johns Hopkins—concurrently published on February 22 in Physical Review Letters with matching results—use computer models to reveal so-called nonlinear effects in black hole collisions, in which gravitational ripples influence each other like waves on a shore.

“Nonlinear effects are what happens when waves on the beach crest and crash,” said Keefe Mitman, Caltech astronomer and lead author on one of the studies, in a press release. “The waves interact and influence each other rather than ride along by themselves. With something as violent as a black hole merger, we expected these effects but had not seen them in our models until now.”

[Related: ‘Rogue black holes’ might be neither ‘rogue’ nor ‘black holes’]

These new studies investigate a particular part of the black hole-black hole merger, known as ringdown because it resembles the vibrations of a struck bell. When black holes collide, they temporarily form one lumpy and unstable large black hole that needs to settle down into a simple, round shape. This settling and shifting releases the gravitational waves that make up the ringdown. Since the mathematics describing this process is unwieldy, prior work assumed gravitational waves don’t interact with each other. 

But this new work tackles those complicated events and discovered the waves in fact influence each other. In computer simulations, the Caltech group modeled what happens when two black holes collide in orbits that aren’t perfect circles, and the Johns Hopkins team smashed two black holes together head-on at almost the speed of light. Both these scenarios are particularly energetic, leading to the nonlinearities they expect to see. 

To explain why energetic collisions have this result, Mitman likens this to two people on a trampoline. Two jumpers who gently hop up and down shouldn’t affect each other that much, as he points out in the press release. “But if one person starts bouncing with more energy, then the trampoline will distort, and the other person will start to feel their influence,” Mitman said. “This is what we mean by nonlinear: the two people on the trampoline experience new oscillations because of the presence and influence of the other person.”

Without accounting for nonlinear effects, physicists may be wrong about the size and other properties of the black holes they detect—of which there have been many with LIGO over the past few years. Plus, these details are key for making sure our understanding of the laws of physics are fully correct, such as checking the intricacies of Albert Einstein’s theory of general relativity.

[Related: We’re still in the dark about a key black hole paradox]

“Black hole ringdowns offer a great playground to test Einstein’s theory of relativity,” says Sumeet Kulkarni, a University of Mississippi astronomer not affiliated with the study. “But to use ringdowns as a test, one must understand them completely. This study takes us a step closer to this understanding.”

For now, however, nonlinearities are only seen in the realm of supercomputers. Humanity’s best black hole detectors aren’t sensitive enough to spot these small effects. Future detector projects are already in the works, though, and researchers are already starting to plan for the future. 

“An obvious next step is to gauge whether these effects will be detectable in LIGO or next generation detectors,” says Mark Ho-Yeuk Cheung, physicist and lead author of the Johns Hopkins study. The Cosmic Explorer and the Einstein Telescopes are two upcoming gravitational wave experiments that may be able to do the job. “While the prospects are promising,” Cheung adds, “we still need to quantify more precisely how and when they will be detected.”

Not only do the pair of simulations shed new light on the mysteries of black holes, they also illustrate the beauty of the scientific process: two teams of scientists producing independent results, complementing and supporting the others’ findings. As Mitman tells Popular Science, “I’m just charmed that we have yet another beautiful example of theorists and numerical relativists coming together to discover something fascinating about the way black holes work.”

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In high school science class, textbooks often feature a recognizable image of the Earth and all its layers—currently, that’s the crust, outer and inner mantle, and outer and inner core. But a new study published February 21 in Nature Communications might leave all of those graphics a little outdated. Seismologists at the Australian National University analyzed the reverberating waves from powerful earthquakes and found what they believe to be evidence of a distinct innermost inner core.

Each inner division of the Earth plays its own unique role in our lives. We exist on top of the thin, outermost layer called the crust. Although there have been past efforts to dig deep enough to break into the mantle, no one has succeeded yet. The mantle, both outer and inner, are made up of liquid rock, and the convection currents present there are responsible for the jostling and bumping of the crust’s tectonic plates. Finally, there’s the core. The liquid outer layer of the core is responsible for producing Earth’s magnetic field, which is further stabilized by the solid inner section. 

[Related: The Earth’s inner core could be slowing its spin—but don’t panic]

We can’t easily study the inner structure of the Earth, so geologists research the mantle by examining samples of rock from volcanic eruptions that may have come from that far underground. On top of that, they study the seismic waves produced by earthquakes. When an earthquake starts at an epicenter deep underground, the movement creates waves that shake the surface. Those waves can be measured by seismometers all around the globe, and by measuring just how fast the seismic waves are moving, seismologists can figure out a surprising amount about just what the center of the Earth looks like.

That is, when the numbers make sense. For a while, seismologists had noticed that when they measured earthquake waves passing through the very center of the inner core, their models would be less accurate. All waves, seismic or otherwise, travel at different speeds through different materials, but a phenomenon called anisotropy means that waves can also travel at different speeds in different directions. In 2002, researchers proposed the existence of the innermost inner core as a way to explain the anisotropic effects they had found when examining some powerful earthquakes.

Now, more research seems to be supporting that theory. As the number of seismic recording stations has increased in recent years, it’s become easier to triangulate exactly how fast and in what direction a wave is moving. The seismologists at the ANU looked at earthquakes above a magnitude of 6.0 over the last decade to determine the exact path of the seismic waves. Because of the increase in equipment, scientists were able to track the waves as they bounced around the Earth up to five times. And indeed, their findings supported that as the waves passed through the center of the Earth, their path was altered as if there was an innermost inner core. The researchers think the divide comes from a different crystal arrangement of the iron and nickel atoms that make up the core.

Some seismologists aren’t completely convinced by the findings because it’s still not clear that this is a hard boundary rather than a gradual transition. But discovering a new layer of the earth doesn’t happen often, and if the innermost inner core continues to be backed up by evidence, the authors argue it might just give geologists more insight into the geologic structure of the earliest days of the planet. 

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Weather folklore says that in the Northern Hemisphere, March goes “in like a lion, out like a lamb.” Usually, we can expect fierce wintery weather to kick off the third month of the year and calm springlike weather to end it. While it is tough to predict exactly what kind of weather that the transitional and temperamental month of March brings, there are some cosmic events to keep your eye on as the days get a little bit longer. If you happen to get any stellar sky photos, tag us and include #PopSkyGazers.

[Related: Balloon bots might help uncover Venus’ hazy secrets.]

March 1 and 2 – Venus meets Jupiter

The night sky’s two brightest planets will slide past one another and on the dome of the sky. In North America, Venus and Jupiter’s closest pairing should occur shortly after sunset on Wednesday March 1, where they’ll pass approximately a full moon’s width (half a degree) apart. Throughout the rest of this month, Jupiter will drop in the western sky and will hide near the sun for a bit, and emerge later in the spring as a morning planet. Venus will remain in the western sky for the rest of the spring into the middle of summer. 

March 6 and 7 – Full worm moon

March’s full moon will reach peak illumination at 7:42 AM EST on Tuesday, March 7. Beginning on March 6, the bright moon will begin to rise above the horizon. According to the Farmers Almanac, this year’s worm moon will look especially large to us when it’s near the horizon due to the “Moon illusion.” This is when the moon appears bigger near comparative celestial objects than it does when it’s higher in the sky without any other references. 

The name worm moon has a few different origins. It originally was believed to refer to when earthworms appear as the soil warms during the spring, inviting birds to feed. However, new research from the Farmer’s Almanac found that during the 1760s, Captain Jonathan Carver, a colonial explorer from Massachusetts, visited the Naudowessie (Dakota) and other Native American tribes and wrote “Worm Moon” refers to beetle larvae which start to emerge from the thawing bark of trees and places they hide out during the winter.

March’s full moon is also called the Crow Moon or Aandego-giizis and the Sugar Marking Moon or Ziinsibaakwadooke-giizis in Anishinaabemowin (Ojibwe), The Day is Cut in Two Moon or Tewehnislya’ks in Oneida, and the Spring Moon or Upinagasraq in Inupiaq.

[Related: Landing on the moon only made us love it more.]

March 20 – Vernal equinox

The March or Vernal equinox marks the first day of spring in the Northern Hemisphere. The equinox will arrive on March 20 at 5:24 pm EST. 

The equinox brings seasonal effects all over the globe and occurs twice a year (once in the spring and once in the fall). The March equinox brings earlier sunrises, later sunsets and sprouting plants to the Northern Hemisphere and the opposite effects to the Southern Hemisphere.

At the equinox, both hemispheres are equally receiving the sun’s rays. The word actually comes from the Latin aequus (equal) and nox (night), since night and day were believed to be the same amount of time since Greek astronomer Hipparchus discovered the equinoxes. However, as timekeeping has gotten more precise, we know that they are not equal during the equinox. The fastest sunsets and sunrises—the length of time it takes for the whole sun to fall below the horizon—occur during both equinoxes.

The same skygazing rules that apply to pretty much all space-watching activities are key this month: Go to a dark spot away from the lights of a city or town and let the eyes adjust to the darkness for about a half an hour. 

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On February 14, geostationary communications satellite company Astranis announced that it had been awarded a contract with the US Space Force worth over $10 million. The contract is to first demonstrate a secure comms technique on the satellite hardware in a terrestrial test setting, and also includes the possibility of testing it in space. 

Space remains a useful place for countries to place sensors that look down on other nations. Many of these satellites reside in low Earth orbit, or about 1,200 miles above the surface, which is easier for satellites to reach and lets satellites circle the globe rapidly. Geostationary orbit, which is 22,200 miles above ground, is harder to get to. Plus, satellites at all altitudes risk having signals jammed, or being disrupted by other objects in orbit, which has led the US military to pursue satellite constellations, or formations of smaller satellites, as a way to ensure that some functionality persists in the event of attack or disaster. 

“We build small satellites for higher orbits, starting with geostationary orbit, which is quite a higher orbit,” says Astranis co-founder and CEO John Gedmark. “It’s the special orbit where you can park a single satellite over a part of the world or over a country and provide continuous service with just that one satellite.”

Over Alaska and Peru

Geostationary satellites have been used to provide communications and television broadcasts, and Astranis’ primary aim for both commercial and military customers is to use smaller geostationary satellites to provide continuous broadband-level internet connections. For two demonstrations of commercial uses, Gedmark points to upcoming launches placing satellites above Alaska (scheduled for early April), and one later this year that will put a satellite above Peru.

“This is a satellite that’ll go up over Peru and also provide some coverage in Ecuador. We will basically allow them to go and deploy and upgrade a number of cell towers out in some of the most remote parts of the country,” said Gedmark. “There’s a lot of parts of Peru where the terrain is just super rough and pretty extreme in the jungles, they have Andes mountains, they have a lot of things that make it very hard to get connectivity out to some of these remote areas.”

In both these places, the satellites will augment existing telecommunications infrastructure on the ground, letting remote towers connect through space instead of over land. Peru, like Alaska, contains vast stretches of varying terrain, where infrastructure such as wires, cables, or fiber internet connections can be hard to place. Freestanding cell phone towers can be set up, powered locally, and then route their communications through satellites instead of over-land wires, bringing 3G and 4G levels of internet to places people could not previously access it.

For military use

Those same traits, for connecting local rural infrastructure to wider data networks through space, are part of what makes Astranis satellites so appealing to the military.

“We realized that the military has this real problem right now for milsatcom and for some other capabilities around resiliency, right? They are really dependent on a small handful of these giant geo satellites, some of which cost billions of dollars. And those satellites are, as we like to quote General Hyten on this, big fat and juicy targets,” said Gedmark.

In 2017, Air Force General John Hyten was the head of US Strategic Command, and announced that he would no longer “support the development any further of large, big, fat, juicy targets,” referring to those types of satellites. Hyten retired in 2021, but the Department of Defense has continued to push for smaller satellites to fill the skies, as a more resilient option than all-in-one massive satellites of the present. Many of these constellations are aimed at low earth orbit.

“Without getting into specific pricing, we could put up about a dozen or more of our satellites for the cost of one of the big ones,” says Gedmark. Since 2018, Astranis has attracted venture funding on its premise to put satellites into geostationary orbit. 

“It’s hard to design all the electronics for the harsh radiation environment of geo, you’re right in the thick of the Van Allen belts,” says Gedmark. The Van Allen belts contain charged particles that can damage satellites, so anything built to survive has to endure the heavy ion strikes and radiation dosages inherent to the region. “These higher orbits are harder to get to, so you have to solve that with some clever onboard propulsion strategies. We solve that by having an electric propulsion system, and having an ion thruster on board.”

When launched, the satellites are aimed towards geostationary orbit, and then use their own power to reach and maneuver in space. Gedmark says the satellites are designed to stay in geostationary orbit for between 8 and 10 years, with the ability to relocate up to 30 times in that period.

The speed at which the satellites can be maneuvered from one orbit to another depends on how much fuel the satellite operators are willing to expend, with repositioning possible in days, though Gedmark expects moving to a new location in weeks will be the more typical use case. 

Once in orbit, the satellites need to communicate securely. The Protected Tactical Waveform is a communications protocol and technique developed by the US military, which Astranis aims to demonstrate can be run on the software-defined radio of its satellites. (A software-defined radio  is a computer that can change its parameters for transmitting and receiving information with code, while a more traditional radio requires analog hardware, like modulators and amplifiers, to encode and decode information from radio signals.) 

The Protected Tactical Waveform is “a set of techniques that are programmed into the radio so it can automatically avoid jamming and interference,” says Gedmark. “We’re gonna start by doing that as a demo in our lab, and then with the future satellites do that as an on orbit demo.”

Because this protocol will run on software radio, rather than hardware that is fixed on form once launched, it likely means that should the need arise, Astranis could adapt existing commercial satellites to carry the Protected Tactical Waveform, while it remains in orbit, facilitating the surge communications as events arise and to meet military need.

For now, the promise is that private investment in communication tech can yield a tool useful both for expanding internet connectivity across the globe, and for providing communications to US military forces in the field faster than it would take to set up ground-based infrastructure. For the Space Force, which is tasked with ensuring reliable communications across the heavens, more durable satellites that can be maneuvered as needed would allow it to redeploy assets across the skies to win wars on Earth.  

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On Friday, February 17, a part of the sun erupted. A piercingly bright flash of light—a solar flare—shone briefly from the left limb of our star, where it was captured in an ultraviolet image by NASA’s Solar Dynamics Observatory spacecraft.

“It wasn’t the largest in history by any means, but it was a significant X flare,” Thomas Berger, a solar physicist and director of the Space Weather Technology, Research, and Education Center at the University of Colorado Boulder. (The “X” refers to the letter grading system of solar flare intensity, which ranges from minor A-class to severe X-class flares. “Solar flares of that magnitude will generally cause some radio-interference on the sunlit side of the Earth for an hour or two,” he says. Ultimately, this one was fairly mild—the most powerful solar flare ever recorded, in 2003, was more than 100 times more powerful by comparison—and did not cause any major problems. 

That said, we’re about to enter a more volatile chapter in the sun’s 11-year cycle of magnetic activity. Solar flares are one of three major forms of solar-eruption activity, along with coronal mass ejections and radiation storms, which are likely to increase in frequency over the next few years, according to Berger.

”We are in the rising phase of Solar Cycle 25, and it is expected that activity is going to increase,” he says. (It’s known as Solar Cycle 25 because scientists first began keeping detailed records of sunspots in 1755, and there have been 25 cycles since that time.) The peak of this period, known as the solar maximum, should occur around 2025. The last solar maximum was in 2014.

[Related: How worried should we be about solar flares and space weather?]

That rise in activity that could majorly impact planned space activities, such as the rapidly growing constellations of low-Earth orbit satellites. And a 2025 solar maximum would coincide with NASA’s Artemis III, which aims to return humans to the surface of the moon—not the safest place to be during a solar radiation storm.

 “It’s going to be a really interesting time if we get an extreme storm in this solar cycle,” Berger says.

What is the solar magnetic cycle?

The sun is a giant sphere of roiling, superheated plasma that is essentially electrically charged gas with monstrously powerful magnetic fields.

For reasons astronomers don’t yet understand, the activity of these magnetic fields increases and decreases over an 11-year cycle. The cycle also includes changes in the dark areas on the star’s surface, otherwise known as sunspots, with more spots appearing as the sun moves toward solar maximum.

“Sunspots are the source of solar magnetic eruptions,” Berger says. “The bigger the sunspot, the bigger the explosion. The more active the sun, the more sunspots, and the bigger the sunspots get.”

The current solar cycle stands out so far in a big way: So far, it’s more active than forecast by groups like the the National Oceanic and Atmospheric Administration’s Space Weather Prediction Center, with more sunspots showing up on the sun that predicted.    

“We don’t know if it will continue to be more active than the forecast,” Berger says. “It’s fairly early on in the game here and could regress back to that weak forecast any month.”

Will solar eruptions disrupt Earth in 2025?

Solar eruptions occur when the magnetic field lines in a sunspot get twisted and snap, Berger says, causing an explosion with three possible outcomes.

The first is a solar flare, like that seen on February 17, which is primarily a release of photons. The second is a coronal mass ejection, or a large release of plasma into interplanetary space. And the third is a radiation storm fueled by accelerating energy particles like protons, elections, and ions. Coronal mass ejections can also sometimes generate a radiation storm by pushing charged particles in front of them as they speed through space.

Solar flares, if intense enough, can cause radio interference on the sunlit side of the Earth. Coronal mass ejections are the outbursts that really cause issues. The charged plasma can generate a geomagnetic storm when it hits our planet’s magnetosphere, resulting in awe-inspiring auroras at the poles, while also wreaking havoc on both power grid technology and satellite technology, Berger says. A big geomagnetic storm can heat the atmosphere so that it swells, dragging on low-flying satellites and even pulling some from orbit, as was the doomed case of 40 newly launched Starlink satellites on February 4, 2022.

Not every coronal mass ejection will reach Earth, however. Many, like the ejection associated with the February 17 eruption, fly off into space away from our planet. The question is whether any more will be aimed our way as we hurtle toward the solar maximum.

“Recent research is really beginning to confirm that almost every solar cycle has a really, really big eruption,” Berger says, “So it’s really just a matter of what direction in space it’s going.”

How do we plan for the sun’s unruly future?

Really  powerful solar eruptions can lead to geomagnetic storms that damage electronics on the ground, such as the the storm in 1989 that knocked out some power grids. But the risks are higher today than in 1989, if just because there’s a lot more technology, and people, in space on a regular basis. For instance, there were more than 5,700 satellites in orbit at the end of 2022, while there were less than 500 satellites in 1989.

“If we do get an extreme geomagnetic storm now, there’s so much stuff up there that’s going to be moving all over the place,” Berger says. “We are concerned with an elevated risk of collision from the next one.”

[Related: What happens when the sun burns out?]

With NASA planning on heading back to the moon and eventually to Mars, scientists will need to get a lot better at forecasting solar eruptions. Physicists like Berger and researchers at the Space Weather Prediction Center can currently predict solar eruptions, but with what meteorologists would consider fairly lousy accuracy and detail compared to 10-day forecast of sunshine and rain.

“We can tell you when the coronal mass ejection will hit, roughly, plus or minus 10 hours,” Berger explains, “But we don’t have a good way to forecast what is going to happen in the low-Earth orbit environment.” In other words, it’s tough to say how much a geomagnetic storm will affect the operation and trajectory of satellites and regular electrical operations on the ground.

The sticking point for better forecasts is that while NOAA runs an ongoing simulation of the Earth’s upper atmosphere, that model isn’t yet able to assimilate real-time data the way terrestrial weather forecast models can. “That is a research program that will take several years to come to fruition,” Berger says.

In the meantime, the sun will keep climbing toward solar maximum in 2025. But even after that peak, it doesn’t mean satellites and astronauts are out of the woods as far as solar storms are concerned. “Really any time between now and 2028 or 2029, we could potentially get a large eruption beginning to hit the Earth,” Berger says. That probably won’t affect daily life, but NASA and satellite operators will need to keep an eye toward the sun.      

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This article was originally featured on The Conversation.

For most of human history, the stars blazed in an otherwise dark night sky. But starting around the Industrial Revolution, as artificial light increasingly lit cities and towns at night, the stars began to disappear.

We are two astronomers who depend on dark night skies to do our research. For decades, astronomers have been building telescopes in the darkest places on Earth to avoid light pollution.

Today, most people live in cities or suburbs that needlessly shine light into the sky at night, dramatically reducing the visibility of stars. Satellite data suggests that light pollution over North America and Europe has remained constant or has slightly decreased over the last decade, while increasing in other parts of the world, such as Africa, Asia and South America. However, satellites miss the blue light of LEDs, which are commonly used for outdoor lighting – resulting in an underestimate of light pollution.

An international citizen science project called Globe at Night aims to measure how everyday people’s view of the sky is changing.

Measuring light pollution over time

Relying on citizen scientists makes it much easier to take multiple measurements of the night sky over time from many different places.

To provide data to the project, volunteers enter the date and time, their location and local weather conditions into an online reporting page anytime an hour or more after sunset on certain nights each month. The page then shows eight panels, each displaying a constellation visible at that time of year – like Orion in January and February, for example. The first panel, representing a light-polluted night sky, only shows the few brightest stars. Each panel shows progressively more and fainter stars, representing darker and darker skies. The participant then matches what they see in the sky with one of the panels.

The Globe at Night team launched the report page as an online app in 2011, just at the beginning of widespread adoption of LEDs. In the recent paper, the team filtered out data points taken during twilight, when the Moon was out, when it was cloudy or when the data was unreliable for any other reason. This left around 51,000 data points, mostly taken in North America and Europe.

The data shows that the night sky got, on average, 9.6% brighter every year. For many people, the night sky today is twice as bright as it was eight years ago. The brighter the sky, the fewer stars you can see.

If this trend continues, a child born today in a place where 250 stars are visible now would only be able to see 100 stars on their 18th birthday.

Causes, impacts and solutions

The main culprits driving increasing brightness of the night sky are urbanization and the growing use of LEDs for outdoor lighting.

The loss of dark skies, both from light pollution and also from increasing numbers of satellites orbiting Earth, threatens our ability as astronomers to do good science. But everyday people feel this loss too, as the degradation of dark skies is also a loss of human cultural heritage. Starry night skies have inspired artists, writers, musicians and philosophers for thousands of years. For many, a star-filled sky provides an irreplaceable sense of awe.

Light pollution also interferes with the daily cycle of light and dark that plants and animals use to regulate sleep, nourishment and reproduction. Two-thirds of the world’s key biodiversity areas are affected by light pollution.

Individuals and their communities can make simple changes to reduce light pollution. The secret is using the right amount of light, in the right place and at the right time. Shielding outdoor light fixtures so they shine downward, using bulbs that emit more yellow-colored light instead of white light and putting lights on timers or motion sensors can all help reduce light pollution.

The next time you are far away from a major city or another source of light pollution, look up at the night sky. A view of the roughly 2,500 stars you can see with the naked eye in a truly dark sky might convince you that dark skies are a resource worth saving.

Chris Impey is a distinguished professor of astronomy at the University of Arizona and receives funding from the National Science Foundation and Epic Games. Connie Walker is a
scientist at the National Optical-Infrared Astronomy Research Laboratory and works for NSF’s NOIRLab and the International Astronomical Union. She is a member of the American Astronomical Society COMPASSE and on the Board of Directors for the International Dark-Sky Association.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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In our solar system neighborhood, there’s one planetary family that we haven’t met properly: the ice giants, Uranus and Neptune. Thanks to Voyager mission flybys, we’ve said hello and we know their faces—but we’ve never stopped over for a visit. Now, planetary scientists have decided to make long-overdue plans to walk over and ring the doorbell for a house tour.

The 2022 Planetary Science Decadal Survey, an influential document for planning future missions run by the National Academies of Science, Engineering, and Medicine, recommended NASA prioritize sending an orbiter and probe to Uranus in the coming decades. Past decrees from this process have launched some of the most exciting projects of the 2020s, including the Mars Sample Return and the upcoming Europa Clipper mission.

With eight planets and countless smaller rocks to explore in our solar system, how could planners possibly settle on a single destination—especially when that decision involves millions, or billions, of dollars and affects hundreds of careers? In a recent commentary for Science, Johns Hopkins Applied Physics Lab planetary scientist Kathleen Mandt argues why Uranus is the right choice—and other researchers seem to agree.

“We’ve sent missions to every other planet, to comets, to asteroids, and to trans-Neptunian objects. We’ve sent missions out of the solar system and to the surface of the sun…. Uranus and Neptune are the enigmas of the solar system,” says Will Saunders, an astronomer at Boston University who studies Uranus’s atmosphere.

Humanity’s last up-close glimpse of Uranus, and its sibling ice giant, Neptune, was back in the 1980s with the Voyager probes. Although Neptune would be nearly equally scientifically interesting—its captured Kuiper Belt Object moon, Triton, is of particular curiosity due to its icy volcanoes and more—the extra billion miles to that planet was the dealbreaker.

“The main reason that we chose Uranus first is because it is easier to get to,” Mandt tells Popular Science. “And we have already waited more than three decades for a mission to these planets. Going to Uranus first means less risk and a mission that can arrive at the planet sooner.”

For a planetary mission, “soon” means within the next few decades—the trip to Uranus takes 10 to 15 years, and engineers still need to design and build the spacecraft. As of now, the plan is to launch by 2032, hopefully reaching Uranus by the mid-2040s. The mission would have two parts: an orbiter, which would circle the planet for at least five years, and a probe to dive into the clouds and collect information about the Uranian atmosphere. 

Some key measurements that astronomers have for Jupiter and Saturn are still missing for Uranus, such as the amount of noble gases and the ratio of different types of nitrogen. The probe will measure these chemical markers because they’re fingerprints of how and when the planet formed. “The formation of the four giant planets and the way they moved to new locations had a major impact on the whole solar system,” says Mandt. This planetary rearrangement “may be how we got water on Earth,” she adds, and that motion launched many of the objects in the Kuiper Belt and Oort Cloud to their current positions.

[Related: Expect NASA to probe Uranus within the next 10 years]

Plus, Uranus is the only planet fully knocked on its side: It’s tilted 98 degrees, which is wild compared to Earth’s 23-degree angle. That causes some quirks in its atmosphere. Planetary scientists are puzzled by the resulting patterns of clouds and wind on Uranus, which they hope to resolve in this mission.

Uranus also has 27 moons, some of which may host oceans below their thick icy surfaces. Subsurface oceans are, of course, one of astrobiologists’ favorite targets for extraterrestrial life, and the satellites of Uranus are no exception. One of the major surprises from Voyager was that Uranus’s five largest moons—Miranda, Ariel, Umbriel, Titania, and Oberon—weren’t “cold dead worlds,” as Mandt describes in the article, but were instead geologically active.

“Simply put, I want another picture of Miranda before I die,” says Adeene Denton, a planetary scientist at the University of Arizona Lunar and Planetary Laboratory. “Miranda is, to me, one of the coolest and most unusual places in the solar system, covered in geologic terrains we haven’t seen anywhere else.”

The lessons from Uranus aren’t bound to our solar system, either. In the past few decades, exoplanet astronomers have found that Uranus-sized worlds may be the most common type of planet out there. An up-close study of our local example will be invaluable for astronomers trying to understand distant exoplanets—particularly helpful will be determining properties of Uranus’s core and internal structure, such as whether it’s made of rock or ice.

[Related: Uranus blasted a gas bubble 22,000 times bigger than Earth]

“We have not seen Uranus up close since before I was born. That was before we knew about the existence of exoplanets,” says University of Bristol astronomer Hannah Wakeford. “This mission to Uranus is going to change our understanding of our solar system, and planets across our galaxy.”

The upcoming Uranus orbiter and probe mission has the potential to be a revolutionary event in science, bringing our understanding of the ice giants up to par—doing what Cassini did for Saturn and Juno for Jupiter. “An orbiter is really what we need to do profound science that characterizes the entirety of the Uranian system,” says Denton. “There is so much to see and do, and committing to an orbiter is really truly worth it.” 

Plus, it will return incredible images of the edges of our solar system, certain to excite and inspire future scientists and space fans. Whenever NASA comes knocking, it always packs cameras, and this meet-and-greet is no exception.

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Using the first dataset released by the James Webb Space Telescope (JWST), an international team of scientists have discovered something surprising– evidence of six massive galaxies that existed during the early days of our universe. 

“These objects are way more massive​ than anyone expected,” said Joel Leja, an astronomer and astrophysicist at Penn State University, in a statement. “We expected only to find tiny, young, baby galaxies at this point in time, but we’ve discovered galaxies as mature as our own in what was previously understood to be the dawn of the universe.”

[Related: Astronomers are already using James Webb Space Telescope data to hunt down cryptic galaxies.]

Leja is co-author of a study published February 22 in the journal Nature that could change some of our preconceived notions of how galaxies form. These newly discovered galaxies themselves date back to about 500 to 700 million years after the Big Bang. JWST has infrared-sensing instruments on board that can detect light that was emitted by the most ancient stars and galaxies, allowing astronomers to see roughly 13.5 billion years back in time. 

“This is our first glimpse back this far, so it’s important that we keep an open mind about what we are seeing,” Leja said. “While the data indicates they are likely galaxies, I think there is a real possibility that a few of these objects turn out to be obscured supermassive black holes. Regardless, the amount of mass we discovered means that the known mass in stars at this period of our universe is up to 100 times greater than we had previously thought. Even if we cut the sample in half, this is still an astounding change.”

Since these six galaxies were far more massive than anyone on the team expected them to be, they could upend previous notions about the galaxy formation at the very beginning of the universe.

“The revelation that massive galaxy formation began extremely early in the history of the universe upends what many of us had thought was settled science,” said Leja. “We’ve been informally calling these objects ‘universe breakers’ — and they have been living up to their name so far.”

The authors argue that the “universe breakers” are so large, that almost all modern cosmological models fail to explain how these star systems could have formed.

[Related: Our universe mastered the art of making galaxies while it was still young.]

“We looked into the very early universe for the first time and had no idea what we were going to find,” Leja said. “It turns out we found something so unexpected it actually creates problems for science. It calls the whole picture of early galaxy formation into question.”

One way that the team can confirm their new findings is with a spectrum image that could  provide data on the true distances between us and the mysterious galaxies, as well as  the gasses and other elements present. It would also paint a more clear picture of what these galaxies looked like billions of years ago.

“A spectrum will immediately tell us whether or not these things are real,” Leja said. “It will show us how big they are, how far away they are. What’s funny is we have all these things we hope to learn from James Webb and this was nowhere near the top of the list. We’ve found something we never thought to ask the universe — and it happened way faster than I thought, but here we are.”

NASA released JWST’s first full-color images and spectroscopic data on July 12, 2022. One of JWST’s primary goals this year is to better map and create a timeline of the earliest days of the universe with its high resolution and infrared spotting capabilities.  

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Despite what Star Trek’s warp-speed journeys would have us believe, interplanetary travel is quite the hike. Take getting to Mars. Probes sent to the Red Planet by NASA and other space agencies spend about seven months in space before they arrive at their destination. A trip for humans would probably be longer—likely on the timescale of a few years. 

There are a lot of things that a human crew needs to survive that robots don’t, such as food, water, oxygen, and enough supplies for a return—the weight of which can slow down a spacecraft. With current technology, NASA calculations estimate a crewed mission to Mars and back, plus time on the surface, could take somewhere between two and three years. “Three years we know for sure is feasible,” says Michelle Rucker, who leads NASA’s Mars Architecture Team in the agency’s ​​Human Exploration and Operations Mission Directorate.

But NASA aims to shorten that timeline, in part because it would make a Mars mission safer for humans—we still don’t know how well the human body can withstand the environment of space for an extended period. (The record for most consecutive days in space is 437.) The agency is investing in projects to develop new propulsion technologies that might enable more expeditious space travel. 

A crooked path to Mars

In a science-fictional world, a spacecraft would blast off Earth and head directly to Mars. That trajectory would certainly make for a speedier trip. But real space travel is a lot more complicated than going from point A to point B.

“If you had all the thrust you want, you could ignore the fact that there happens to be gravity in our universe and just plow all the way through the solar system,” says Mason Peck, a professor of astronautics at Cornell University who served as NASA’s chief technologist from 2011 to 2013. “But that’s not a scenario that’s possible right now.”

Such a direct trajectory has several challenges. As a spacecraft lifts off Earth, it needs to escape the planet’s gravitational pull, which requires quite a bit of thrust. Then, in space, the force of gravity from Earth, Mars, and the sun pulls the spacecraft in different directions. When it is far enough away, it will settle into orbit around the sun. Bucking that gravity requires fuel-intensive maneuvers.

[Related: Signs of past chemical reactions detected on Mars]

The second challenge is that the planets do not stay in a fixed place. They orbit the sun, each at its own rate: Mars will not be at the same distance from Earth when the spacecraft launches as the Red Planet will be, say, seven months later. 

As such, the most fuel-efficient route to Mars follows an elliptical orbit around the sun, Peck says. Just one-way, that route covers hundreds of millions of miles and takes over half a year, at best. 

But designing a crewed mission to the Red Planet isn’t just about figuring out how fast a spacecraft can get there and back. It’s about “balance,” says Patrick Chai, in-space propulsion lead for NASA’s Mars Architecture Team. “There are a whole bunch of decisions we have to make in terms of how we optimize for certain things. Where do we trade performance for time?” Chai says. “If you just look at one single metric, you can end up making decisions that are really great for that particular metric, but can be problematic in other areas.”

One major trade-off for speed has to do with how much stuff is on board. With current technology, every maneuver to shorten the trip to Mars requires more fuel. 

If you drive a car, you know that in order to accelerate the vehicle, you step on the gas. The same is true in a spacecraft, except that braking and turning also use fuel. To slow down, for instance, a spacecraft fires its thrusters in the opposite direction to its forward motion.

But there are no gas stations in space. More fuel means more mass on board. And more mass requires more fuel to propel that extra mass through the air… and so on. Trimming a round-trip mission down to two years is when this trade-off starts to become exponentially less efficient, Rucker says. At least, that’s with current technology.

New tech to speed up the trip

NASA would like to be able to significantly reduce that timeline. In 2018, the space agency requested proposals for technological systems that could enable small, uncrewed missions to fly from Earth to Mars in 45 days or less. 

At the time, the proposals didn’t gain much traction. But the challenge inspired engineers to design innovative propulsion systems that don’t yet exist. And now, NASA has begun to fund the development of leading contenders. In particular, the space agency has its eye on nuclear propulsion.

Spacecraft currently rely largely on chemical propulsion. “You basically take an oxidizer and a fuel, combine them, and they combust, and that generates heat. You accelerate that heated product through a nozzle to generate thrust,” explains NASA’s Chai. 

Engineers have known for decades that a nuclear-based system could generate more thrust using a significantly smaller amount of fuel than a chemical rocket. They just haven’t built one yet—though that might be about to change.

One of NASA’s nuclear investment projects aims to integrate a nuclear thermal engine into an experimental spacecraft. The Demonstration Rocket for Agile Cislunar Operations, or DRACO, program, is a collaboration with the Defense Advanced Research Projects Agency (DARPA), and aims to demonstrate the resulting technology as soon as 2027 .

[Related: Microbes could help us make rocket fuel on Mars]

The speediest trip to Mars might come from another project, however. This concept, the brainchild of researchers at the University of Florida and supported by a NASA grant, seeks to achieve what Chai calls the “holy grail” of nuclear propulsion: a combination system that pairs nuclear thermal propulsion with an electric kind. 

“We did some preliminary analysis, and it seems like we can get pretty close to [45 days],” says the leader of that project, Ryan Gosse, a professor of practice in the University of Florida’s in-house applied research program, Florida Applied Research in Engineering (FLARE). One caveat: That timeline is for a light payload and no humans on board. However, if the project is successful, the technology could potentially be scaled up in the future to support a crewed mission.

There are two types of nuclear propulsion, and both have their merits. Nuclear thermal propulsion, which uses heat, can generate a lot of thrust quickly from a small amount of fuel. Nuclear electric propulsion, which uses charged particles, is even more fuel-efficient but generates thrust much more slowly.

“While you’re in deep space, the electric propulsion is really great because you have all the time in the world to thrust. The efficiency, the miles per gallon, is far, far superior than the high-thrust,” Chai says. “But when you’re around planets, you want that oomph to get you out of the gravity well.”

The challenge, however, is that both technologies currently require different types of nuclear reactors, says Gosse. And that means two separate systems, which reduces the efficiency of having a nuclear propulsion system. So Gosse and his team are working to develop technology that can use the one system to generate both types of propulsion.

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Well, there’s a reasonable explanation. Heat travels through the cosmos as radiation, an infrared wave of energy that migrates from hotter objects to cooler ones. The radiation waves excite molecules they come in contact with, causing them to heat up. This is how heat travels from the sun to Earth, but the catch is that radiation only heats molecules and matter that are directly in its path. Everything else stays chilly. Take Mercury: the nighttime temperature of the planet can be 1,000 degrees Fahrenheit lower than the radiation-exposed day-side, according to NASA.

Compare that to Earth, where the air around you stays warm even if you’re in the shade—and even, in some seasons, in the dark of night. That’s because heat travels throughout our beautiful blue planet by three methods instead of just one: conduction, convection, and radiation. When the sun’s radiation hits and warms up molecules in our atmosphere, they pass that extra energy to the molecules around them. Those molecules then bump into and heat up their own neighbors. This heat transfer from molecule to molecule is called conduction, and it’s a chain reaction that warms areas outside of the sun’s path.

[Related: What happens to your body when you die in space?]

Space, however, is a vacuum—meaning it’s basically empty. Gas molecules in space are too few and far apart to regularly collide with one another. So even when the sun heats them with infrared waves, transferring that heat via conduction isn’t possible. Similarly, convection—a form of heat transfer that happens in the presence of gravity—is important in dispersing warmth across the Earth, but doesn’t happen in zero-g space.

These are things Elisabeth Abel, a thermal engineer on NASA’s DART project, thinks about as she prepares vehicles and devices for long-term voyages through space. This is especially true when she was working on the Parker Solar Probe, she says.

“The job of that heat shield,” Abel says, is to make sure “none of the solar radiation [will] touch anything on the spacecraft.” So, while the heat shield is experiencing the extreme heat (around 250 degrees F) of our host star, the spacecraft itself is much colder—around -238 degrees F, she says.

[Related: How worried should we be about solar flares and space weather?]

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The next private mission to the International Space Station will carry a private paying customer and three trained astronauts, with two members of Saudi Arabia’s nascent space program coming along for the ride.

Expected to launch sometime in the spring from NASA’s Kennedy Space Center aboard a SpaceX Crew Dragon spacecraft, the Axiom Mission 2 will carry four crew members: Former NASA’s astronaut Peggy Whitson will command the mission, civilian John Shoffner of Knoxville, Tennessee, will be the pilot, and Rayyanah Barnawi and Ali Alqarni from Saudi Arabia will serve as mission specialists for a day-long stay on the ISS.  

[Related: What to expect from space exploration in 2023]

Ax-2 will mark the first time in the still relatively new world of commercial space missions where government and private astronauts fly together. It’s also the first time a woman is commanding a private mission. Axiom Mission 1, which launched to the ISS in April 2022, carried Israeli and Canadian men, but as paying private customers of Axiom Space, not representatives of either nation’s space programs.

“Axiom Space’s second private astronaut mission to the International Space Station cements our mission of expanding access to space worldwide,” Axiom Space CEO Michael Suffredini said in a prepared statement.

That may be more than a corporate platitude about democratizing outer space: Axiom could find there is a ready market of countries hoping to make their mark with astronauts of their own. “To date, fewer than a quarter of the countries of the world have sent even one representative to space,” says Laura Forczyk, founder of the space industry analytical firm Astralytical. “Most cannot afford the expense and infrastructure to train and launch government astronauts on their own soil.”

While Axiom didn’t reveal the price paid by Shoffner to fly on the upcoming mission, each of the three Axiom-1 astronauts paid around $55 million for their time on the ISS. It’s a lot of money for most people, but not that much for a nation, and almost a bargain compared to building a space program from scratch.

Saudi Arabia, for instance, began training astronauts in September 2022 as part of the kingdom’s Vision 2030 strategic plan to diversify its economy and move away from dependence on oil production. A February 12 release by the Saudi Press Agency noted the kingdom hopes its astronauts participating in the Axiom-2 mission will “​​empower national capabilities in human spaceflight geared towards serving humanity and benefiting from the promising opportunities offered by the space industry.” Barnawi and Alqarni, a cancer researcher and fighter pilot, respectively, will become the second and third Saudi astronauts to fly in space following the flight of Sultan bin Salman Al Saud aboard the US Space Shuttle in 1985.

The decades-long gap shows that flights on existing government space programs can be hard to come by. Forcyzk notes that even among European Space Agency member states, very few ESA astronauts are selected to fly, with crewed launch vehicle seats via NASA even more precious since ESA ceased working with Roscosmos for launch services in 2022 following the Russian invasion of Ukraine. NASA is also “limited by the agreements that the US government has in place in terms of which countries to partner with in space and in what ways,” she says, detailed in bilateral agreements such as the Artemis Accords. “Commercial companies are not so limited.”

[Related: Ukraine was about to revive its space program. Then Russia invaded.]

That could work out well for Axiom Space, as the company is interested in more than just being an orbital outfitter and could use the expertise of trained astronauts on missions. Axiom is developing the first private station module to be added to the ISS with the intention to eventually expand that structure so it can one day be cut loose as a free flying space station. The company is one of the participants in NASA’s Commercial Destinations in Low-Earth Orbit program, in which the agency is encouraging private companies to develop private space stations that NASA can rent for certain periods of time after the planned retirement of the ISS in 2030.

In a future with multiple private space stations where NASA is just one of many tenants, there could be more opportunities for private and government trained astronauts from nations that haven’t yet had much chance to board a rocket in nearly 70 years of spaceflight. “Commercial human spaceflight has the potential to open up the doors to space globally in a way that government space agencies cannot do,” Forczyk says.

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NASA is enlisting artificial intelligence software to assist engineers in designing the next generation of spacecraft hardware, and real world results resemble the stuff of science fiction.

The agency utilized commercially available AI software at NASA’s Goddard Space Flight Center in Maryland. NASA states that research engineer Ryan McClelland, who worked on the new materials with the assistance of AI, has dubbed them “evolved structures.” They have already been used in the design and construction of astrophysics balloon observatories, space weather monitors, and space telescopes, as well as the Mars Sample Return mission and more.

Beforehand the evolved structures are created, a computer-assisted design (CAD) specialist first sets the new objects’ “off limits” parameters, such as where the parts connects to spacecraft or other instruments, as well as other specifications like bolt and fitting placements, additional hardware, and electronics. Once those factors are defined, AI software “connects the dots” to sketch out a potential new structural design, often within just two hours or less.

The finished products result in curious, unique forms that are up to two-thirds lighter than their purely human-designed counterparts. However, proposed forms generally require some human fine-tuning, Ryan McClellans makes sure to highlight. “The algorithms do need a human eye,” McClelland said. “Human intuition knows what looks right, but left to itself, the algorithm can sometimes make structures too thin.”

[Related: NASA just announced a plane with a radical wing design.]

Optimizing materials and hardware is especially important for NASA’s spacefaring projects, given each endeavor’s unique requirements and needs. As opposed to assembly line construction for mass produced items, almost every NASA part is unique, so shortening design and construction times with AI input expands the agency’s capabilities.

When combined with other production techniques like 3D-printing, researchers envision a time when larger parts could be constructed while astronauts are already in orbit, thus reducing costly payloads. Such assembly plans might even be employed during construction of permanent human bases on the moon and Mars.

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Breathtaking visuals of the swirling arms of spiral galaxies are some of the awe-inspiring images our galaxy and others have to offer. 

In only its first Earth-year in space, the James Webb Space Telescope (JWST), has already captured some stunning images of these spinning wonders.

[Related: Our universe mastered the art of making galaxies while it was still young.]

In the constellation Hercules–named for the Roman spelling of the Greek demigod Heracles known for his strength–are trillions of stars that stretch back about 13 billion light-years. In the lower center of the constellation is a spiral galaxy known as LEDA 2046648. It’s a billion light-years away, but one of its defining characteristics is that it looks like our very own Milky Way galaxy. 

A new image from JWST is so clear that the spiral arms of the galaxy are visible—impressive for a sight so far away. It shows multiple galaxies and stars in six-pointed diffraction spikes that have become one of JWST’s signature observations. 

The image was taken with JWST’s Near-InfraRed Camera (NIRCam) which can detect infrared rays and see light on the infrared spectrum. This is an important part of one of Webb’s main missions of exploring the age of when stars and galaxies first began to light up the universe.

JWST also discovered a cannibal galaxy named “Sparkler,” for the dwarf galaxies and 12 globular clusters shining around it. In the results published towards the end of last year in the journal Monthly Notices of the Royal Astronomical Society, it appears to be a “very early” mirror image of the Milky Way. Studying Sparkler could help astronomers understand how our home galaxy took shape. 

[Related: The James Webb Space Telescope just identified its first exoplanet.]

According to the study team, the galaxy is a cannibal because it is gobbling up nearby celestial objects to grow ever larger. It’s believed that the Milky Way galaxy also grew this way. Astronomers spotted the star in JWST’s First Deep Field  released in July 2022. This image is the deepest and most detailed view of the universe ever captured and was Webb’s first full-color picture.

The Sparkler galaxy is shown as a warped orange line surrounded by spots of light. 

“We appear to be witnessing, first hand, the assembly of this galaxy as it builds up its mass—in the form of a dwarf galaxy and several globular clusters,” said co-author Duncan Forbes, an astrophysicist at Swinburne University of Technology in Australia, in a statement. “We are excited by this unique opportunity to study both the formation of globular clusters, and an infant Milky Way, at a time when the universe was only one-third of its present age.”

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Astronomy outreach programs in states, which usually consist of visits to K-12 schools or public lectures, are expanding their reach into prisons, such as at Princeton’s Prison Teaching Initiative and the University of Washington eSTEAM (Education in Science, Technology, Engineering, Astrobiology/Art, and Math) program.

Access to education is a key issue in the mass incarceration epidemic facing America. As of 2010, statistics from the Prison Policy Initiative show at least 25 percent of incarcerated people haven’t finished high school, compared to 13 percent of Americans as a whole. Similarly, far fewer incarcerated individuals have done any post-secondary education before their time in prison—and, to make the situation worse, they lack access to such education once inside. 

Prison college courses in the US are often under-funded (particularly due to a 1994 law barring incarcerated students from Pell Grants), or even entirely absent, leaving millions with no opportunities for educational progress during their sentences. Youth under 18 are required to have some access to education, but these programs are often inadequate and inconsistent as well. Yet, prison education is well-known to have incredibly positive effects—it reduces long-term costs of incarceration, reduces recidivism, and reduces violence within prisons. “If you don’t have a degree, the likelihood that you’ll return to prison in the first year is 70 percent. And if you do have a degree it’s like 13 percent,” explains Erin Flowers, Princeton astronomy PhD candidate and Prison Teaching Initiative Fellow.

Prison education also significantly improves outcomes for incarcerated individuals, such as lower unemployment rates, higher incomes, better health, and increased opportunities for their kids and families. And importantly, education reconnects incarcerated people with the fundamental human rights of knowledge and curiosity, including the ability to know about space. Astronomy courses, in particular, are key to promoting science literacy—an important part of any education in today’s tech-driven world.

[Related: On surviving—and leaving—prison during a pandemic]

Princeton’s Prison Teaching Initiative (PTI) started in 2005 with astronomy faculty and postdoc researchers teaching math classes to incarcerated students, and has now grown into a large program offering coursework across multiple disciplines towards Associate’s and Bachelor’s degrees from partner institutions to local adult prison populations. More than 350 students have earned their degrees across multiple institutions within the New Jersey Department of Corrections. It incorporates full 15-week introduction to astronomy courses and lab-based physics courses through Raritan Valley Community College, which fulfill students’ general science requirements. Flowers explains that her incarcerated students take these courses to further their education and post-education goals as active learners in the program, and many have expressed that they “appreciate having [the program] as an outlet, and they appreciate having something to set their minds to.” 

University of Washington’s eSTEAM program, on the other hand, is only a few years old, and builds off the legacy of other programs such as PTI and NASA’s Astrobiology for the Incarcerated by bringing prison education to the Seattle community. eSTEAM uniquely focuses on tutoring and teaching imprisoned dozens of kids under the age of 18. The program currently helps with astronomy, physics, and any other subjects that the youth need support in. Their goal is to keep students on track with their education, filling in the gaps of their primary classes and supporting them with one-on-one attention and tutoring. The teaching team is also currently designing experiments in astrobiology, the study of life beyond Earth, to bring to the facilities, given that the kids generally don’t get much exposure to fun topics beyond the standard curriculum. One of their working ideas is to have students make a Winogradsky column, a sort of test tube environment that shows how chemistry, physics, and biology intertwine to enable life.

Both programs face significant challenges, as teaching in a prison environment is far different from the usual classroom. With the New Jersey Department of Corrections, instructors must follow facility guidelines regarding dress, behavior, and materials, says Flowers. “For a lab-based class, there’s been a lot of MacGyvering and trial and error trying to adapt those lessons” for use inside the prison, she continues. “Many items we take for granted in a traditional physics classroom are prohibited for safety reasons, and thus suitable alternatives must be found that still maintain the intellectual rigor required for the course.”

Internet access within facilities is also often limited, preventing students from doing their own research outside class or looking into possible careers. Samantha Gilbert, a University of Washington astrobiology graduate student and eSTEAM volunteer, considers a key part of her role as “being that connection to the outside world” for the incarcerated individuals she works with.

She goes on to describe widespread challenges beyond logistics—particularly, how the prison system is designed to punish those incarcerated, even if the supposed goal is rehabilitation. She says the system tends to consider their outreach work “rewarding the students, rather than the basic things that any kid should have access to, regardless of the mistakes they’ve made in their life.”

Although many teachers and volunteers inside prisons want what’s best for the students, there are still many who treat them as lesser due to their status. Gilbert recalls a particularly heartbreaking scene, where she was “watching a child grab all of the work that they had been doing out of the trash, because apparently a security guard got really mad and threw it all away.”

Both Flowers and Gilbert see their astronomy and education outreach as crucial to building a future where prisons are no longer a place to discard people from society. Instead, they dream of a future where prison is more rehabilitative, or even abolished entirely in favor of other community-based solutions.

Gilbert says her work in juvenile facilities makes “you feel even more strongly that they should be allowed to turn their lives around.” She continues to say that this is true of the adult population as well, even if they tend to garner less instinctual sympathy from many people. She urges community members to build connections with their local incarcerated populations in whatever way they can.

[Related: A Palestinian brings stargazing to his homeland, and finds wonder alongside heartbreak]

Educational outreach provides new hope and possibilities for incarcerated people, and re-opens the door to science for many who have been denied it previously—especially groups who are disproportionately affected by policing. “The problem isn’t that marginalized people aren’t excited about science early on. The problem is the way marginalized people are systemically pushed out of science,” says Gilbert.

The factors impacting participation in astronomy and other sciences stretch far beyond traditional school systems, and outreach programs are finally expanding their efforts to match. “By using the knowledge that we have and the resources that we have,” says Gilbert, they’re opening prisons up to the planets, stars, and all the space that lies between.

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