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Universe Today

Scientists find evidence of faraway worlds colliding

Illustration: Star with two planets colliding in orbit
An artist's conception shows a planetary collision around a star called Gaia20ehk. (Credit: Andy Tzanidakis / Univ. of Washington)

Astronomers say unusual readings from a star system 11,000 light-years away suggest that two of the planets circling the star crashed into each other, creating a huge, light-obscuring cloud of rocks and dust.

The analysis, laid out this week in a paper published by The Astrophysical Journal Letters, could provide new insights into the occasionally cataclysmic process that governs the evolution of planetary objects — including our own planet Earth and its moon.

“There are only a few other planetary collisions of any kind on record, and none that bear so many similarities to the impact that created the Earth and moon,” University of Washington graduate student Anastasios Tzanidakis, the study’s lead author, said in a news release. “If we can observe more moments like this elsewhere in the galaxy, it will teach us lots about the formation of our world.”

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A quick guide to the total lunar eclipse — and the weather

Three views of total lunar eclipse from March 14, 2025
A photo sequence shows the total lunar eclipse of March 14, 2025. (Sky & Telescope Photo / Edwin L. Aguirre and Imelda B. Joson).

Tonight’s full moon will turn into a red moon during the last total lunar eclipse we’ll be able to see for the next two years — but whether we’ll truly be able to see it with our own eyes depends on the weather. And that’s an iffy proposition for Pacific Northwest skywatchers.

The good news is that total lunar eclipses, unlike a total solar eclipse, can be seen from an entire hemisphere at a time. They occur when the orbital mechanics are just right for Earth to pass directly between the moon and the sun. For about an hour, Earth’s shadow blots out the sun’s rays, except for reddish wavelengths that are refracted by our planet’s atmosphere. That’s what lends the moon its blood-red color.

Tonight’s eclipse begins with a barely discernable penumbral phase at around 1:30 a.m. PT Tuesday, gets into its partial phase at 1:50 a.m. and enters totality at 3:04 a.m. The eclipse’s total phase ends at 4:03 a.m., and the partial phase winds down over the following hour or two.

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NASA overhauls moon plan — and Blue Origin may benefit

Illustration: Blue Moon lander on lunar surface
An artist’s conception shows the integrated design for the Blue Moon lander. (Blue Origin Illustration)

NASA is reworking its Artemis moon program to add a test mission for commercial lunar landers in low Earth orbit next year, with a crewed lunar landing to follow in 2028 at the earliest. The revised plan raises the profile of the Blue Moon lander that’s being built by Jeff Bezos’ Blue Origin space venture.

“We’re all in!” Blue Origin CEO Dave Limp said in a post to X.

NASA Administrator Jared Isaacman, who took up his post last December, announced the schedule shift today. “This is going to be our pathway back to the moon,” he said.

The next step in the pathway is the same as it has been: NASA is getting set to use its giant Space Launch System rocket to launch four astronauts on a 10-day trip around the moon in an Orion capsule. That Artemis 2 mission is currently set for no earlier than April, due to a helium leak that forced this week’s rocket rollback from the launch pad for troubleshooting.

NASA’s previous plan called for following up on Artemis 2 with a crewed lunar landing next year for Artemis 3. However, the development of the SpaceX Starship lander for that mission has proceeded more slowly than expected.

Under the revised architecture, Artemis 3 becomes a crewed orbital test for SpaceX’s Starship and/or Blue Origin’s Blue Moon lander. The mission could also test the next-generation spacesuits that are being developed for extravehicular activities. The Artemis program’s first crewed lunar landing would follow in 2028, presumably using either Starship or Blue Moon.

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Cosmic Space

Moon rocket goes back to the garage for troubleshooting

SLS rocket and Orion crew spacecraft inside VAB
NASA has returned its Space Launch System rocket and Orion crew capsule to the Vehicle Assembly Building. (NASA Photo / Cory Huston)

NASA rolled the giant rocket that’s slated to launch four astronauts on a round-the-moon trip back to its garage today to troubleshoot a problem with its helium pressurization system.

The Space Launch System rocket, topped by an Orion crew capsule, returned to the 52-story Vehicle Assembly Building at Kennedy Space Center in Florida at about 8 p.m. ET (5 p.m. PT), NASA said. It took more than 10 hours for NASA’s crawler-transporter to make the 4-mile trip from Launch Complex 39B.

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Helium problem forces NASA to delay moon mission

NASA Administrator Jared Isaacman and troubleshooting team at launch pad with SLS rocket in background
NASA Administrator Jared Isaacman, far left, accompanies a troubleshooting team at the Artemis 2 launch pad. (NASA Photo)

NASA Administrator Jared Isaacman says the giant rocket set to send four astronauts around the moon for the history-making Artemis 2 mission must be rolled back from its launch pad to troubleshoot a technical problem.

The 10-day mission, previously scheduled for as soon as March, is now postponed until April at the earliest. “I understand people are disappointed by this development,” Isaacman said in a posting to X. “That disappointment is felt most by the team at NASA, who have been working tirelessly to prepare for this great endeavor.”

The technical issue cropped up just days after a successful launch-pad rehearsal at NASA’s Kennedy Space Center. Data from the Space Launch System rocket’s upper stage registered an interruption in the flow of helium, which is used to pressurize the propellant tanks and purge the engines. “Last evening, the team was unable to get helium flow through the vehicle,” Isaacman wrote today. “This occurred during a routine operation to repressurize the system.”

Isaacman said the helium pressurization system worked correctly during this week’s wet dress rehearsal. For what it’s worth, a problem with a helium valve cropped up during preparations for the uncrewed Artemis 1 round-the-moon mission in 2022, leading NASA managers to take corrective actions.

The current problem could be due to a failure at any of several points in the helium system. “Regardless of the potential fault, accessing and remediating any of these issues can only be performed in the VAB,” said Isaacman, referring to the 52-story Vehicle Assembly Building where the SLS and its Orion crew capsule were stacked for launch.

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NASA completes rehearsal for Artemis moon launch

SLS rocket illuminated by lights at launch pad
NASA's Space Launch System rocket stands on its Florida launch pad. (NASA Photo / Aubrey Gemignani)

NASA counted down to T-minus 29 seconds during a smooth rehearsal for a historic launch that could send astronauts around the moon for the first time in more than half a century.

The run-through at Launch Complex 39B, at Kennedy Space Center in Florida, was known as a wet dress rehearsal because it involved filling up the propellant tanks on NASA’s Space Launch System, a 322-foot-tall rocket that made its debut with 2022’s uncrewed Artemis 1 mission.

The only major component that was missing at the launch pad was the crew. NASA astronaut Reid Wiseman, the commander for the Artemis 2 mission, said in a posting to X that he was watching the proceedings from Launch Control.

Once NASA reviews the results of the two-day rehearsal, mission managers will decide whether to give the final go-ahead for the Artemis 2 crew’s 10-day trip around the moon and back.

Lori Glaze, acting associate administrator for NASA’s Exploration Systems Development Mission Directorate, said the space agency is targeting March 6 for liftoff. “Every night I look at the moon, and I see it, and I get real excited because I can really feel she’s calling us,” she told reporters today. “And we’re ready.”

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Fiction Science Club

Occupy Mars? Or the moon? It’s time for a reality check

Illustrations: Moon Village and Mars habitat
Artist's concepts show a moon village at left and a Mars habitat at right. (Left image: ESA. Right image: Team SEArch+/Apis Cor via NASA)

It’s an age-old debate in space circles: Should humanity’s first city on another world be built on the moon, or on Mars?

As recently as last year, SpaceX founder Elon Musk saw missions to the moon as a “distraction.” In a post to his X social-media platform, he declared that “we’re going straight to Mars.”

But last week, Musk said he’s changed his mind: “For those unaware, SpaceX has already shifted focus to building a self-growing city on the Moon, as we can potentially achieve that in less than 10 years, whereas Mars would take 20+ years,” he wrote on X.

How realistic is either option, particularly on a 10- to 20-year time frame? In a new book titled “Becoming Martian,” Rice University evolutionary biologist Scott Solomon lays out the possibilities as well as the perils that could make Musk’s job more challenging than he thinks.

“The more research I did on this topic, and the more labs I visited, and papers I read, and experts I spoke with, what became clear to me is that we have some pretty big gaps in our knowledge, in our understanding of what the reality would be like,” Solomon says in the latest episode of the Fiction Science podcast.

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Interlune digs into opportunities for lunar construction

Interlune prototype excavator being tested on rocky patch of land
Interlune and Vermeer worked together to test a full-scale prototype of an excavator with auxiliary components. (Interlune / Vermeer Photo)

Interlune is leveraging a $150,000 NASA contract to develop develop lunar trenching and excavation technology — and although the primary goal is to extract valuable helium-3 from moon dirt, the project also signals the company’s broader play for lunar infrastructure.

Interlune’s work on the Small Business Technology Transfer Phase 1 contract, done in partnership with the Colorado School of Mines, demonstrates that the Seattle-based startup’s business model isn’t limited to helium-3. In the years ahead, the technologies pioneered by Interlune for resource extraction can also be used for building roads, base camps and other construction projects on the moon.

For example, the excavator that’s the focus of the NASA funding — known as the Scalable Implement for Lunar Trenching, or SILT — will support Interlune’ plan to sift through tons of lunar soil. But it will also support NASA’s Artemis program, which aims to establish a sustainable lunar presence in the 2030s.

“We’re looking at some other tools that would move regolith around, or prepare a site for making a road or building a radiation berm, burying a certain piece of infrastructure like a nuclear reactor,” Interlune CEO Rob Meyerson told me. “So, we’re very interested in participating in the Artemis program in broader ways, and we think the technology we’re developing for helium-3 extraction can support that.”

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Fiction Science Club

Why NASA is going nuclear for a power play on the moon

Illustration: Nuclear power plant with a tower-type radiator
An artist's conception shows a nuclear power plant on the moon. (Lockheed Martin Illustration)

Almost 60 years after America won the first space race, the moon is once again the focus of a competition between superpowers: Who’ll be the first to put a nuclear-powered base on the lunar surface?

And just as President John F. Kennedy set a goal of landing astronauts on the moon and bringing them back safely “before the decade is out,” NASA and the Department of Energy have set another end-of-decade deadline for developing a nuclear reactor for use on the moon. The current plan calls for demonstrating a 40-kilowatt power plant by 2030.

Why 2030? Roger Myers, an aerospace consultant who has been in the business of developing in-space power and propulsion systems for decades at NASA and Aerojet Rocketdyne, says the timing is tied to China’s ambition to set up its own moon base by 2035.

“China has announced many times in the last few years that they plan to land their astronauts, their taikonauts, on the surface of the moon by 2030, and they want to have a sustained presence on the surface of the moon by 2035,” he says in the latest episode of the Fiction Science podcast. “The United States has a decision to make: Do we want every human on the planet to look up every night and see just a Chinese flag? Or do we want them to see a Chinese and an American flag?”

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Interlune brings in more cash to get set for moon mining

Illustration: Interlune Harvester on the moon
An artist’s conception shows the Interlune Harvester on the lunar surface. (Interlune Illustration)

Seattle-based Interlune is raising additional investment to support its campaign to identify and extract resources on the moon that can be brought back to Earth, starting with helium-3.

The fundraising effort came to light in a document filed with the Securities and Exchange Commission this week. The $5 million offering takes the form of a Simple Agreement for Future Equity, or SAFE, a contractual arrangement in which investors have the right to receive equity in the company at a later time.

In its initial filing on Jan. 28, Interlune reported that $500,000 of the offering had been sold to a set of six investors. The filing didn’t identify the investors.

In an emailed statement, Interlune CEO Rob Meyerson said the SAFE funding would help support the company’s preparations for the lunar missions ahead.

“Interlune has elected to raise $5 million on a Simple Agreement for Future Equity from existing and new investors to advance key technical milestones ahead of its next priced round,” Meyerson said. “We have several significant projects in the works, which we’re excited to announce shortly.”

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