Amazon is buying satellite communications company Globalstar for $10.8 billion to expand its Leo satellite-internet network and compete more directly with SpaceX's Starlink. The deal also includes a partnership with Apple to support satellite connectivity for iPhones and Apple Watches, with Amazon planning voice, data, and messaging services starting in 2028. The New York Times reports: Leo was Amazon's move to enter the market for beaming high-speed internet to the ground from orbit. That is an arena dominated by Elon Musk's SpaceX, which operates the Starlink satellite-internet service. Starlink, which has thousands of satellites in orbit, already serves several million customers around the world. This month, SpaceX filed to go public in what is shaping up to be one of the largest-ever initial public offerings. Mr. Musk has valued SpaceX -- which has landed contracts with federal agencies such as NASA and the Department of Defense -- at more than $1 trillion. Other companies are racing to catch up to what Mr. Musk has built for space.

Globalstar, founded in 1991, is a Louisiana-based global telecommunications company. It operates networks of low-Earth orbiting satellites to provide internet connectivity to customers. Paul Jacobs, Globalstar's chief executive, said in a statement that together, the two companies "will advance innovations in digital connectivity."

"Breathable oxygen has been created from Moon dust," reports the Telegraph, "in a world first that paves the way for a lunar base."

Jeff Bezos's Blue Origin ""announced this week that it had developed a reactor that could successfully release oxygen from lunar soil by using an electric current." Almost half of Moon dust — the thin layer of rock that blankets the lunar surface — is oxygen, but it is bound to metals such as iron and titanium... Previous work to isolate oxygen has been lab-based, and the unwieldy equipment needed has been too difficult to send to the Moon. In contrast, Blue Origin said its small-scale reactor, named Air Pioneer, could be made flight-ready to "provide the first breath of life for a sustainable Moon base"... As well as breathable air, Blue Origin said the reactor produces other critical elements for planetary infrastructure, such as iron, aluminium and silicon for construction and electronics, as well as glass for windows and solar panel covers. The company has previously said it wants to turn the Moon, and eventually Mars, into "self-sustaining worlds where robots and humans can go beyond visiting and truly explore, grow, live, and thrive"....

Blue Origin said it would need to generate around one megawatt of power to drive the reactors — about the energy it would require to power around 400 to 1,000 homes simultaneously. It envisages that each lunar settlement would have an array of nearby solar panels, generating the power needed for one reactor.
Besides breathable air for astronauts, the oxygen could also be used in propellant for refuelling landers and fuel cells, Blue Origin points out — and "produced right where they're needed, and at much lower cost than being brought from Earth."

Thanks to Slashdot reader fjo3 for sharing the article.

NASA's Artemis II crew safely splashed down off the California coast after completing a 10-day trip around the moon and back. "This is not just an accomplishment for NASA," sad NASA Administrator Jared Isaacman. "This is an accomplishment for humanity, again, a historic mission to the moon and back." From a report: Isaacman is aboard the USS John. P Murtha Navy recovery vessel, where the astronauts will be brought once they've been retrieved from the Orion capsule, and he shared "there is a lot to celebrate right now on on a mission well accomplished for Artemis II."

Isaacman also complimented the crew as "absolutely professional astronauts, wonderful communicators and almost poets" "" as well as "ambassadors from humanity to the stars." "I can't imagine a better crew than the Artemis II crew that just completed a perfect mission right now. We are back in the business of sending astronauts to the moon and bringing them back safely.

This is just the beginning. We are going to get back into doing this with frequency, sending missions to the moon until we land on it in 2028 and start building our base." Isaacman also said it's time to start preparing for Artemis III, expected to launch in 2027. You can watch the moment of the splashdown here.

BrianFagioli writes: Artificial intelligence has now run directly on a satellite in orbit. A spacecraft about 500km above Earth captured an image of an airport and then immediately ran an onboard AI model to detect airplanes in the photo. Instead of acting like a simple camera in space that sends raw data back to Earth for later analysis, the satellite performed the computation itself while still in orbit.

The system used an NVIDIA Jetson Orin module to run the object detection model moments after the image was taken. Traditionally, Earth observation satellites capture images and transmit large datasets to ground stations where computers process them hours later. Running AI directly on the satellite could reduce that delay dramatically, allowing spacecraft to analyze events like disasters, infrastructure changes, or aircraft activity almost immediately. "This success is a glimpse into the future of what we call Planetary Intelligence at scale," said Kiruthika Devaraj, VP of Avionics & Spacecraft Technology. "By running AI at the edge on the NVIDIA Jetson platform, we can help reduce the time between 'seeing' a change on Earth and a customer 'acting' on it, while simultaneously minimizing downlink latency and cost. This shift toward integrated AI at the edge is a technological leap that can help differentiate solutions like Planet's Global Monitoring Service (GMS), providing valuable insights for our customers and enabling rapid response times when it matters most."

Artemis II has broken the Apollo 13 record for the farthest distance humans have ever traveled from Earth. NASA reports: The Artemis II crew of NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with CSA (Canadian Space Agency) astronaut Jeremy Hansen have set the record for the farthest distance from Earth traveled by a human mission, surpassing the Apollo 13 record of 248,655 miles set in 1970.

NASA Flight Director Brandon Lloyd, Capsule Communicator Amy Dill, and Command and Handling Data Officer Brandon Borter also marked a lighthearted milestone today by emailing the crew what is now assumed to be the longest person-to-person message ever sent in human history. After breaking the record for human spaceflight, crew also took a moment to provisionally name a couple of craters on the Moon, noting they were able to see them with their naked eye.

Just northwest of Orientale basin highlighted above is a crater they would like to name Integrity after their spacecraft and this historic mission. Just northeast of Integrity, on the near and far side boundary, and sometimes visible from Earth, the crew suggested Carroll crater in honor of Reid Wiseman's late wife, Carroll Taylor Wiseman. After this mission is complete, the crater name proposals will be formally submitted to the International Astronomical Union, the organization that governs the naming of celestial bodies and their surface features. On April 1, NASA successfully launched humanity's first crewed trip around the Moon in more than 50 years. A couple of days into the mission, attention turned to a more mundane problem when reports said the astronauts had access to "two Microsoft Outlooks" and neither was working properly. By April 4, the crew had passed 100,000 miles from Earth as they continued deeper into space, and by April 6, they had entered the Moon's gravitational pull and caught their first views of the lunar far side.

NASA's Artemis astronauts are now entering "the lunar sphere of influence," reports NBC News, "meaning the pull of the moon's gravity will become stronger than Earth's." Now as they begin their swing around the moon, the Artemis astronauts "are chasing after Apollo 13's maximum range from Earth," reports the Associated Press, hoping to beat its distance from Earth by more than 4,100 miles (6,600 kilometers).

They'll begin their six-hour lunar flyby 14 hours from now (at 2:45 p.m. ET Monday). But in a space-to-earth interview Saturday with NBC News, the astronauts were already describing their first glimpses of the edge of the far side: [NASA astronaut Christina Koch realized] it looked different from what she was accustomed to on Earth. "The darker parts just aren't quite in the right place," she said. "And something about you senses that is not the moon that I'm used to seeing...."

[Astronaut Reid] Wiseman called the flight a "magnificent accomplishment" and said the astronauts' ability to gaze at both Earth and the moon from their spacecraft has been "truly awe-inspiring." "The Earth is almost in full eclipse. The moon is almost in full daylight, and the only way you could get that view is to be halfway between the two entities," he said... And while the early photos of Earth and the moon that [Canadian astronaut Jeremy] Hansen and his colleagues have beamed back have been spectacular, the Canadian astronaut said they pale in comparison to the real deal outside their capsule's windows. "I know those photos are amazing," he said, "but let me assure you, it is another level of amazing up here."
And their upcoming six-hour lunar flyby "promises views of the moon's far side that were too dark or too difficult to see by the 24 Apollo astronauts who preceded them," notes the Associated Press: A total solar eclipse also awaits them as the moon blocks the sun, exposing snippets of shimmering corona.... At closest approach, they will come within 4,070 miles (6,550 kilometers) of the moon. Because they launched on April 1, the rendezvous won't have as much of the far lunar side illuminated as other dates would have. But the crew still will be able make out "definite chunks of the far side that have never been seen" by humans, said NASA geologist Kelsey Young, including a good portion of Orientale Basin.

They'll call down their observations as they photograph the gray, pockmarked scenes. There's a suite of professional-quality cameras on board, and each astronaut also has an iPhone for more informal, spur-of-the-minute picture-taking... Orion will be out of contact with Mission Control for nearly an hour when it's behind the moon. The same thing happened during the Apollo moonshots. NASA is relying on its Deep Space Network to communicate with the crew, but the giant antennas in California, Spain and Australia won't have a direct line of sight when Orion disappears behind the moon for approximately 40 minutes...

Once Artemis II departs the lunar neighborhood, it will take four days to return home. The capsule will aim for a splashdown in the Pacific near San Diego on April 10, nine days after its Florida launch. During the flight back, the astronauts will link up via radio with the crew of the orbiting International Space Station. This is the first time that a moon crew has colleagues in space at the same time and NASA can't pass up the opportunity for a cosmic chitchat.

The Artemis II crew has passed 100,000 miles from Earth and is now on a "free-return" path around the moon after a successful "translunar" injection burn. "Ladies and gentlemen, I am so, so excited to be able to tell you that for the first time since 1972 during Apollo 17, human beings have left Earth orbit," NASA's Dr Lori Glaze told a news conference. The Guardian reports: The astronauts -- the Americans Reid Wiseman, Victor Glover and Christina Koch, and a Canadian, Jeremy Hansen -- spent their first day in space performing checks on the spacecraft, which had never carried humans before. Later they had time to speak to US TV networks. "I've got to tell you, there is nothing normal about this," Wiseman told ABC News from the cramped interior of the capsule. "Sending four humans 250,000 miles away is a herculean effort, and we are now just realising the gravity of that."

Orion will travel about 4,000 miles (6,400km) beyond the moon before turning back, providing unprecedented and illuminated views of the lunar far side. If all proceeds smoothly, the astronauts will set a record by venturing farther from Earth than any human before -- more than 250,000 miles. The mission is part of a longer-term plan to repeatedly return to the moon, with the aim of establishing a permanent base that will offer a platform for further exploration. After the final engine burn, NASA said Wiseman took two "spectacular" images of Earth.

The first photo, called Hello, World, "shows the vast expanse of blue that is the Atlantic Ocean, framed by a thin glow of the atmosphere as the Earth eclipses the Sun and green auroras at either pole," reports the BBC. Another photo shows the view of Earth from inside the Orion spacecraft.

Reuters reports that SpaceX has confidentially filed for a U.S. IPO, reportedly targeting a valuation above $1.75 trillion. Reuters reports: SpaceX puts more rockets in space than any other company and promises a chance to invest in humanity's return to the moon and attempt to colonize Mars. The company aspires to put artificial intelligence data centers in space, while running a lucrative satellite communications system that opens up much of the earth to the internet and is increasingly used in war. [...]

A public listing at a potential valuation of more than $1.75 trillion comes after SpaceX merged with Musk's artificial intelligence startup xAI in a deal that valued the rocket company at $1 trillion and the developer of the Grok chatbot at $250 billion. SpaceX is hosting an analyst day on April 21, encouraging research analysts to attend in person, [...]. The company is also offering analysts an optional visit to xAI's "Macrohard" data center site in Memphis, Tennessee, on April 23, and plans to hold a virtual session on May 4 to discuss financial models with banks' research analysts, the source said.

A Starlink satellite broke apart in orbit after suffering an unexplained "anomaly," apparently due to an "internal energetic source" rather than a collision. "The incident appears to have created some debris, with fragments likely to fall to Earth over the next few weeks," reports Scientific American. From the report: The satellite lost communication at about 560 kilometers above Earth, Starlink said. While the statement from Starlink, which is a subsidiary of Musk's rocket company SpaceX, merely noted that investigations are ongoing, LeoLabs said its radar observations of the event indicated an "internal energetic source" as the likely cause rather than a collision.

The incident underscores the potential hazards of the increasingly large numbers of satellites and other spacecraft in low-Earth orbit -- some 10,000 Starlinks are currently in orbit and counting. Starlink's statement said that "the event poses no new risk" to the International Space Station or to the upcoming launch of NASA's Artemis II mission, targeted for April 1.

Project Hail Mary has now grossed $300.8 million globally after earning another $54.1 million this weekend from 86 markets, reports Variety, noting that after just nine days it's now Amazon MGM's highest-grossing film ever.

And last weekend it had the best opening for a "non-franchise" movie in three years, adds the Associated Press — the best since 2023's Oppenheimer: Project Hail Mary, which cost nearly $200 million to produce... is on an enviable trajectory. Its second weekend hold was even better than that of Oppenheimer, which collected $46.7 million in its follow-up frame.
But the movie is based on a book by The Martian author Andy Weir, described by one news outlet as "a former software engineer and self-proclaimed 'lifelong space nerd'... known for his realistic and clear-eyed approach to scientifically technical stories." Project Hail Mary has plenty of real science in it, whether it be space mathematics, physics, or astrobiology... The film's namesake project is even comprised of the space programs of other nations, such as Roscosmos from Russia, the Chinese space program, and the European Space Agency...

The story relies on work NASA has done regarding exoplanets, or planets outside our solar system... [This includes a nearby star named Tau Ceti approximately 12 light years from Earth which is orbited by four planets — two once thought to be in "the habitable zone" where liquid water can exist.] Tau Ceti has long been the setting used by sci-fi authors and storytellers. Isaac Asimov used it for his Robot series. Arthur C. Clarke's "Rama" spacecraft came across a mysterious tetrahedron in the Tau Ceti system. Authors Ursula K. Le Guin and Kim Stanley Robinson also set stories in Tau Ceti, and it also serves as the extrasolar setting of the 1968 Jane Fonda film Barbarella. Most recently, the Bungie video game Marathon is set in the far-off system, serving as part of the background story for the extraction shooter, about a large-scale plan to colonize the Tau Ceti system.
The movie also mentions 40 Eridani A, according to the article, a real star about 16 light-years away that was said to be orbited by the fictional planet Vulcan, home to Star Trek's Mr. Spock. It's also mentioned in Frank Herbert's Dune as the star system of the planets Ix and Richese ("noted for their machine culture and miniaturisation," according to the Stellar Australis site's "Project Dune" page).

And in a video on IMAX's YouTube channel, the film's directors explain how for a crucial scene they used non-visible-light photography, which is also an important part of modern astronomy. "Even the credits incorporate real astrophotography into the final moments," the article points out, using the work of award-winning Australian astrophotographer Rod Prazeres. "The only difference between his work of capturing space data in images and what ended up on the big screen was that he gave them 'starless versions' of his photographs to make it easier to place credit text over them."

Prazeres wrote on his web site that he was touched the producers "wanted the real thing... In a world where CGI and AI are everywhere, it meant a lot..."

How powerful is Jupiter's lightning? Thick clouds cover the view, notes Science magazine. But using an instrument on NASA's Juno spacecraft (orbiting Jupiter for the past decade), researchers determined Jupiter's lightning bolts are 100 to 10,000 times more energetic than earth's: A single bolt of lightning on Earth releases about 1 billion joules of energy. That means the most extreme bolts of jovian lightning carry 10 trillion joules of energy, equivalent to 2400 tons of TNT, or one-sixth the power of the atomic bomb dropped on Hiroshima, Japan. Based on the rates of flashes seen by Juno, storms on this tempestuous world can unleash the force of multiple nuclear weapons every minute...

The four storms Juno studied were monstrous, says Michael Wong, a planetary scientist at the University of California, Berkeley and one of the study's authors. There were three flashes per second on average, often emerging from the hearts of storms that are 3000 kilometers across, longer than the distance from New York City to Denver.
The researchers used the Hubble Space Telescope (and photographs from Juno's camera) to track Jupiter's storms with such precision that their radiometer could then pick out individual lightning flashes, according to the article. "It's just a massive ball of gas. It makes sense that there's very energetic lightning happening," says Daniel Mitchard, a lightning physicist at Cardiff University who wasn't involved with the new study. But confirming such suspicions "is exciting," he says, because lightning plays an important role in forging complex chemistry — including the sort that primordial life is built on.
Thanks to Slashdot reader sciencehabit for sharing the article.

Thirty years after the alleged 1996 "ET of Varginha" encounter, debate continues to rage over the events that happened in Brazil's self-styled UFO capital. An anonymous reader quotes an excerpt from the Guardian: The skies over this far-flung coffee-growing hub went charcoal black, the heavens opened and one of Brazil's greatest mysteries was born. "It really was something unique," recalls Marco Antonio Reis, a zoo director, who was at his ranch outside Varginha one stormy day in January 1996 when, he says, an otherworldly creature came to town. Reis and other locals claim the unusually ferocious downpour heralded a series of disturbing and seemingly paranormal events. At least six of the zoo's animals, including a spider monkey, a tapir and a raccoon, died mysteriously after a horned interloper with bulging red eyes was spotted in the vicinity by a woman who had gone out for a smoke. When a vet examined their corpses, "they were all black inside," Reis claims.

On a nearby wasteland, three young women spotted a peculiar and malodorous being with a heart-shaped face and three lumps on its head cowering beside a wall. "I've seen the devil," one of those witnesses would later tell her mum. Soon afterwards, an unexplained infection was rumored to have killed a strapping police intelligence officer who was said to have grappled with the oleaginous unidentified being. Three decades later, Reis says he is convinced Varginha received a non-human visit. His only doubt was from where it came.

"We don't know if it was extraterrestrial or intraterrestrial," the 71-year-old says as he climbs a staircase to the veranda where the smoker claims to have seen what, in reference to Steven Spielberg's 1982 film, became known as the "ET of Varginha". A 2ft statue of a two-toed alien now marks the spot. "It's possible it was an intraterrestrial, from inside the Earth They don't just come from space," Reis says. "It might have come from the depths of the Earth, too. We don't even know what it's like at the bottom of the sea, do we?"

"Billionaire Elon Musk has announced plans to build a $20 billion chip plant in Austin, Texas" reports a local news station: Musk announced on Saturday night during a livestream on his social media platform X that the plant, called "Terafab," will be built near Tesla's campus and gigafactory in eastern Travis County. The long-anticipated project is a joint venture between Musk-owned properties Tesla, SpaceX and xAI... The Terafab plant is expected to begin production in 2027.
Musk "has said the semiconductor industry is moving too slow to keep up with the supply of chips he expects to need," writes Bloomberg — quoting Musk as saying "We either build the Terafab or we don't have the chips, and we need the chips, so we build the Terafab." Musk detailed some specific plans, including producing chips that can support 100 to 200 gigawatts a year of computing power on Earth, and chips that can support a terawatt in space, but gave no timelines for the facility or its output... The facility is expected to make two types of chips, one of which will be optimized for edge and inference, primarily for his vehicle, robotaxi and Optimus humanoid robots. The other will be a high-power chip, designed for space that could be used by SpaceX and xAI... Musk said he expects xAI to use the vast majority of the chips.

During the presentation, Musk also unveiled a speculative rendering of a future "mini" AI data center satellite, one piece of a much larger satellite system that he wants SpaceX to build to do complex computing in space. In January, SpaceX requested a license from the Federal Communications Commission to launch one million data center satellites into orbit around Earth. Musk said that the mini satellite he revealed would have the capacity for 100 kilowatts of power. "We expect future satellites to probably go to the megawatt range," Musk said.

Raising money to build and launch AI data centers in space is one of the driving forces behind SpaceX's planned IPO later this year. SpaceX is expected to raise as much as $50 billion in a record-setting IPO this summer which could value it at more than $1.75 trillion, Bloomberg News reported earlier.

Longtime Slashdot reader SchroedingersCat writes: Chuck Norris, known for his roles in action films and as Texas Ranger Cordell Walker on the TV show "Walker, Texas Ranger," passed away on March 19, leaving behind a legacy of inspiring millions around the world. He was 86.

He became Internet phenomenon after "Chuck Norris Facts" went viral online with such wildly hyperbolic statements as, "Chuck Norris had a staring contest with the sun -- and won," and, "When Chuck Norris does push-ups, he doesn't push himself up, he pushes the Earth down."

His death was announced by his family through his official Instagram account, but no further details were immediately available. He was hospitalized earlier that day in Hawaii after experiencing a medical emergency, the family said.

sciencehabit shares a report from Science.org: In The Martian, fictional astronaut Mark Watney survives the wasteland of Mars by growing potatoes in lunar soil -- with a bit of help from human poop. The idea may not be so far-fetched. In a preprint posted this month on bioRxiv, researchers show potatoes can indeed grow in the equivalent of Moon dust, though they need a lot of help from compost found on Earth. To make the discovery, scientists first had to re-create lunar regolith -- the loose, powdery layer that blankets the Moon's surface. To replicate that in the lab, David Handy, a space biologist at Oregon State University (OSU), and his colleagues used a mix of crushed minerals and volcanic ash that matched the chemistry of the Moon.

But lunar regolith is entirely devoid of the organic matter that plants need to grow. "Turning an inorganic, inhospitable bucket of glorified sand into something that can support plant growth is complex," says Anna-Lisa Paul, a plant molecular biologist at the University of Florida not involved with the work. So Handy and his colleagues added vermicompost -- organic waste from worms -- into the regolith. They found that a mix with 5% compost allowed the potatoes to grow while still emulating the stressful conditions of the lunar environment. After almost 2 months of growth, the team harvested the tubers, freeze-dried them, and ground them up for further testing.

Analysis of the potatoes' DNA showed stress-related genes had been activated. The potatoes also had higher concentrations of copper and zinc than Earth-grown ones, which may make them dangerous for human consumption. The plants' nutritional value, though, was similar to traditional potatoes -- a surprise to the scientists, who expected lower levels of nutrition "because the plants might have been working overtime to overcome certain stressors," Handy says.

Samples from the asteroid Ryugu contain all five nucleobases -- the key building blocks of DNA and RNA. "This strengthens the idea that asteroids may have brought the ingredients for the first living organisms to Earth long ago," reports New Scientist. From the report: Japan's Hayabusa 2 spacecraft visited Ryugu in 2018, where it shot two projectiles -- one small and one large -- into the surface of the asteroid and collected the resulting debris. It arrived back at Earth with the samples in 2020 and researchers have been analyzing these in detail ever since. Yasuhiro Oba at Hokkaido University in Japan and his colleagues examined two samples, one from the asteroid's surface and one comprised of subsurface materials excavated by the projectiles. In both, the team found all five primary nucleobases, which are the compounds that make up the nucleic acids DNA and RNA when combined with sugars and phosphoric acid.

This isn't the first time that nucleobases have been found in asteroid samples: they have been seen in meteorites, too, and in samples from the asteroid Bennu. The researchers did find different abundances of the various nucleobases among the various samples, though, which hints that these compounds might be useful for tracing asteroids and meteorites back to the parent bodies that they broke off from in the distant past, as well as understanding the evolution of those parent bodies over time. The findings have been published in the journal Nature Astronomy.

Uber co-founder Travis Kalanick launched a new venture that "will focus on creating 'gainfully employed robots' for the food, mining and transport industries," Bloomberg reports.

"I left Uber in 2017 heartbroken," writes Kalanick on the new company's web site. Kalanick resigned under pressure in 2017, and complains he was "torn away from an idea and a movement that I had poured my life into... I bled, but I did not perish. I got back up and fought my way back into the arena, back to my calling. Back to building. Digitizing the Physical World is my life's work... " Kalanick is remaking his real estate company, City Storage Systems, which owns ghost-kitchen operator CloudKitchens, and renaming it Atoms, according to a manifesto posted on the new company's website. [Bloomberg notes that the company's food robotics division "makes a food assembly machine called Bowl Builder, according to its website."] In addition to its work on food, Los Angeles-based Atoms is expanding into robotics technology for mining and automotive transport. Kalanick said on the livestreamed tech talk show TBPN Friday that Atoms has effectively been in stealth for eight years and has "thousands" of employees....

Kalanick wrote on the Atoms website that the company will make "specialized robots with productive jobs that bring abundance to their owners and society at large." That will include "infrastructure for better food," he wrote, as well as "more productive mines to power Earth's industries" in addition to "wheelbase for robots" in transportation. "The industrial thing is probably our main jam," he said on TBPN. "Once you crack movement in the physical world, there are lots of people who want access to that..." Kalanick also said he was the biggest investor in Pronto, a self-driving trucking startup that currently focuses on closed sites like mines.

Van Allen Probe A, a 1,300-pound (600 kg) NASA satellite launched in 2012 to study Earth's radiation belts, is expected to re-enter Earth's atmosphere this week. While most of it is expected to burn up during descent, "some components may survive," reports the BBC. "The space agency said there is a one in 4,200 chance of being harmed by a piece of the probe, which it characterized as 'low' risk." From the report: The spacecraft is projected to re-enter around 19:45 EST (00:45 GMT) on Tuesday the U.S. Space Force predicted, according to Nasa, though there is a 24-hour margin of "uncertainty" in the timing. [...] The spacecraft and its twin, Van Allen Probe B, were on a mission to gather unprecedented data on Earth's two permanent radiation belts. It was not immediately clear where in Earth's atmosphere the satellite is projected to re-enter. NASA and the U.S. Space Force has said it will monitor the re-entry and update any predictions. [...] Van Allen Probe B is not expected to re-enter the Earth's atmosphere before 2030.

A startup called Reflect Orbital wants to launch thousands of mirror-bearing satellites to reflect sunlight onto Earth at night and "power solar farms after sunset, provide lighting for rescue workers and illuminate city streets, among other things," reports the New York Times. From the report: It is an idea seemingly out of a sci-fi movie, but the company, Reflect Orbital of Hawthorne, Calif., could soon receive permission to launch its first prototype satellite with a 60-foot-wide mirror. The company has applied to the Federal Communications Commission, which issues the licenses needed to deploy satellites. If the F.C.C. approves, the test satellite could get a ride into orbit as soon as this summer. The F.C.C.'s public comment period on the application closes on Monday. "We're trying to build something that could replace fossil fuels and really power everything," Ben Nowack, Reflect Orbital's chief executive, said in an interview. The company has raised more than $28 million from investors.

[...] Reflect Orbital's first prototype, which will be roughly the size of a dorm fridge, is almost complete. Once in space, about 400 miles up, the test satellite would unfurl a square mirror nearly 60 feet wide. That would bounce sunlight to illuminate a circular patch about three miles wide on the Earth's surface. Someone looking up would see a dot in the sky about as bright as a full moon. Two more prototypes could follow within a year. By the end of 2028, Reflect Orbital hopes to launch 1,000 larger satellites, and 5,000 of them by 2030. The largest mirrors are planned to be nearly 180 feet wide, reflecting as much light as 100 full moons. The company said its goal was to deploy the full constellation of 50,000 satellites by 2035.

How much does it cost to order sunlight at night? Mr. Nowack said the company would charge about $5,000 an hour for the light of one mirror if a customer signed an annual contract for 1,000 hours or more. Lighting for one-time events and emergencies, which might require numerous satellites and more effort to coordinate, would be more expensive. For solar farms, he envisions splitting revenue from the electricity generated by the additional hours of light.

NASA heralded a new study published Friday documenting a first for humanity — "the first time a human-made object has measurably altered the path of a celestial body around the Sun."

It was 2022's DART mission where NASA crashed a spacecraft into an asteroid — and the experiment "could have implications for protecting Earth from future asteroid strikes," writes ScienceNews: A spacecraft slowed the orbit of a pair of asteroids around the sun by more than 10 micrometers per second... Within a month, researchers showed that the impact shortened Dimorphos' 12-hour orbit by 32 minutes. Some of the rocks knocked off of Dimorphos fled the vicinity completely, escaping the gravitational influence of the Dimorphos-Didymos pair, says planetary defense researcher Rahil Makadia of the University of Illinois Urbana-Champaign. Those rocky runaways took some momentum away from the duo and changed their joint motion around the sun.

To figure out how much that motion was affected, astronomers watched the asteroids pass in front of distant stars, dimming some of the stars' light like a tiny eclipse. These blinks, called stellar occultations, can be visible from anywhere on Earth and are predictable in advance... Calculating how far off occultation timings were from predictions revealed that the asteroids' orbit around the sun was about 150 milliseconds slower than before the DART impact...

Didymos and Dimorphos are not a threat to Earth, Makadia says, and weren't before DART. But knowing how a deliberate impact changes one asteroid's orbit can help make defense plans against another, "in case we need to do a kinetic impact for real."
The researchers spent nearly two and a half years to collect 22 measurements of the asteroid's post-crash position, relying on amateur astronomers "to go out into the middle of nowhere and observe the necessary stellar occultations," acvcording to their paper. Planetary defense researcher even tells ScienceNews "There was an observer who drove two days each way into the Australian outback to get these measurements."