Space

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Yes, we are about to be treated to a second lunar landing in a week

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Because the space agency now has some expectation that Intuitive Machines will be fully successful with its second landing attempt, it has put some valuable experiments on board. Principal among them is the PRIME-1 experiment, which has an ice drill to sample any ice that lies below the surface. Drill, baby, drill.

The Athena lander also is carrying a NASA-funded “hopper” that will fire small hydrazine rockets to bounce around the Moon and explore lunar craters near the South Pole. It might even fly into a lava tube. If this happens it will be insanely cool.

Because this is a commercial program, NASA has encouraged the delivery companies to find additional, private payloads. Athena has some nifty ones, including a small rover from Lunar Outpost, a data center from Lonestar Data Holdings, and a 4G cellular network from Nokia. So there’s a lot riding on Athena‘s success.

So will it be a success?

“Of course, everybody’s wondering, are we gonna land upright?” Tim Crain, Intuitive Machines’ chief technology officer, told Ars. “So, I can tell you our laser test plan is much more comprehensive than those last time.”

During the first landing about a year ago, Odysseus‘ laser-based system for measuring altitude failed during the descent. Because Odysseus did not have access to altitude data, the spacecraft touched down faster, and on a 12-degree slope, which exceeded the 10-degree limit. As a result, the lander skidded across the surface, and one of its six legs broke, causing it to fall over.

Crain said about 10 major changes were made to the spacecraft and its software for the second mission. On top of that, about 30 smaller things, such as more efficient file management, were updated on the new vehicle.

In theory, everything should work this time. Intuitive Machines has the benefit of all of its learnings from the last time, and nearly everything worked right during this first attempt. But the acid test comes on Thursday.

The company and NASA will provide live coverage of the attempt beginning at 11: 30 am ET (16: 30 UTC) on NASA+, with landing set for just about one hour later. The Moon may be a harsh mistress, but hopefully not too harsh.

Yes, we are about to be treated to a second lunar landing in a week Read More »

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Butch Wilmore says Elon Musk is “absolutely factual” on Dragon’s delayed return

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For what it is worth, all of the reporting done by Ars over the last nine months suggests the decision to return Wilmore and Williams this spring was driven by technical reasons and NASA’s needs on board the International Space Station, rather than because of politics.

Q. How do you feel about waking up and finding yourself in a political storm?

Wilmore: I can tell you at the outset, all of us have the utmost respect for Mr. Musk, and obviously, respect and admiration for our president of the United States, Donald Trump. We appreciate them. We appreciate all that they do for us, for human space flight, for our nation. The words they said, politics, I mean, that’s part of life. We understand that. And there’s an important reason why we have a political system, a political system that we do have, and we’re behind it 100 percent. We know what we’ve lived up here, the ins and outs, and the specifics that they may not be privy to. And I’m sure that they have some issues that they are dealing with, information that they have, that we are not privy to. So when I think about your question, that’s part of life, we are on board with it.

Q. Did politics influence NASA’s decision for you to stay longer in space?

Wilmore: From my standpoint, politics is not playing into this at all. From our standpoint, I think that they would agree, we came up prepared to stay long, even though we plan to stay short. That’s what we do in human spaceflight. That’s what your nation’s human space flight program is all about, planning for unknown, unexpected contingencies. And we did that, and that’s why we flowed right into Crew 9, into Expedition 72 as we did. And it was somewhat of a seamless transition, because we had planned ahead for it, and we were prepared.

Butch Wilmore says Elon Musk is “absolutely factual” on Dragon’s delayed return Read More »

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The modern era of low-flying satellites may begin this week

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Clarity-1 at the pad

Albedo’s first big test may come within the next week and the launch of the “Transporter-13” mission on SpaceX’s Falcon 9 rocket. The company’s first satellite, Clarity-1, is 530 kg (1170 pounds) and riding atop the stack of ridesharing spacecraft. The mission could launch as soon as this coming weekend from Vandenberg Space Force Base in California.

The Clarity-1 satellite will be dropped off between 500 and 600 km orbit and then attempt to lower itself to an operational orbit 274 km (170 miles) above the planet.

This is a full-up version of Albedo’s satellite design. The spacecraft is larger than a full-size refrigerator, similar to a phone booth, and is intended to operate for a lifetime of about five years, depending on the solar cycle. Clarity-1 is launching near the peak of the 11-year solar cycle, so this could reduce its active lifetime.

Albedo recently won a contract from the US Air Force Research Laboratory that is worth up to $12 million to share VLEO-specific, on-orbit data and provide analysis to support the development of new missions and payloads beyond its own optical sensors.

Serving many different customers

The advantages of such a platform include superior image quality, less congested orbits, and natural debris removal as inoperable satellites are pulled down into Earth’s atmosphere and burnt up.

But what about the drawbacks? In orbits closer to Earth the primary issue is atomic oxygen, which is highly reactive and energetic. There are also plasma eddies and other phenomena that interfere with the operation of satellites and degrade their materials. This makes VLEO far more hazardous than higher altitudes. It’s also more difficult to capture precise imagery.

“The hardest part is pointing and attitude control,” Haddad said, “because that’s already hard in LEO, when you have a big telescope and you’re trying to get a high resolution. Then you put it in VLEO, where the Earth’s rotation beneath is moving faster, and it just exacerbates the problem.”

In the next several years, Albedo is likely to reach a constellation sized at about 24 satellites, but that number will depend on customer demand, Haddad said. Albedo has previously announced about half a dozen of its commercial customers who will task Clarity-1 for various purposes, such as power and pipeline monitoring or solar farm maintenance.

But first, it has to demonstrate its technology.

The modern era of low-flying satellites may begin this week Read More »

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SpaceX readies a redo of last month’s ill-fated Starship test flight

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The FAA has cleared SpaceX to launch Starship’s eighth test flight as soon as Monday.

Ship 34, destined to launch on the next Starship test flight, test-fired its engines in South Texas on February 12. Credit: SpaceX

SpaceX plans to launch the eighth full-scale test flight of its enormous Starship rocket as soon as Monday after receiving regulatory approval from the Federal Aviation Administration.

The test flight will be a repeat of what SpaceX hoped to achieve on the previous Starship launch in January, when the rocket broke apart and showered debris over the Atlantic Ocean and Turks and Caicos Islands. The accident prevented SpaceX from completing many of the flight’s goals, such as testing Starship’s satellite deployment mechanism and new types of heat shield material.

Those things are high on the to-do list for Flight 8, set to lift off at 5: 30 pm CST (6: 30 pm EST; 23: 30 UTC) Monday from SpaceX’s Starbase launch facility on the Texas Gulf Coast. Over the weekend, SpaceX plans to mount the rocket’s Starship upper stage atop the Super Heavy booster already in position on the launch pad.

The fully stacked rocket will tower 404 feet (123.1 meters) tall. Like the test flight on January 16, this launch will use a second-generation, Block 2, version of Starship with larger propellant tanks with 25 percent more volume than previous vehicle iterations. The payload compartment near the ship’s top is somewhat smaller than the payload bay on Block 1 Starships.

This block upgrade moves SpaceX closer to attempting more challenging things with Starship, such as returning the ship, or upper stage, back to the launch site from orbit. It will be caught with the launch tower at Starbase, just like SpaceX accomplished last year with the Super Heavy booster. Officials also want to bring Starship into service to launch Starlink Internet satellites and demonstrate in-orbit refueling, an enabling capability for future Starship flights to the Moon and Mars.

NASA has contracts with SpaceX worth more than $4 billion to develop a Starship spinoff as a human-rated Moon lander for the Artemis lunar program. The mega-rocket is central to Elon Musk’s ambition to create a human settlement on Mars.

Another shot at glory

Other changes introduced on Starship Version 2 include redesigned forward flaps, which are smaller and closer to the tip of the ship’s nose to better protect them from the scorching heat of reentry. Technicians also removed some of the ship’s thermal protection tiles to “stress-test vulnerable areas” of the vehicle during descent. SpaceX is experimenting with metallic tile designs, including one with active cooling, that might be less brittle than the ceramic tiles used elsewhere on the ship.

Engineers also installed rudimentary catch fittings on the ship to evaluate how they respond to the heat of reentry, when temperatures outside the vehicle climb to 2,600° Fahrenheit (1,430° Celsius). Read more about Starship Version in this previous story from Ars.

It will take about 1 hour and 6 minutes for Starship to fly from the launch pad in South Texas to a splashdown zone in the Indian Ocean northwest of Australia. The rocket’s Super Heavy booster will fire 33 methane-fueled Raptor engines for two-and-a-half minutes as it climbs east from the Texas coastline, then jettison from the Starship upper stage and reverse course to return to Starbase for another catch with mechanical arms on the launch tower.

Meanwhile, Starship will ignite six Raptor engines and accelerate to a speed just shy of orbital velocity, putting the ship on a trajectory to reenter the atmosphere after soaring about halfway around the world.

Booster 15 perched on the launch mount at Starbase, Texas. Credit: SpaceX

If you’ve watched the last few Starship flights, this profile probably sounds familiar. SpaceX achieved successful splashdowns after three Starship test flights last year, and hoped to do it again before the premature end of Flight 7 in January. Instead, the accident was the most significant technical setback for the Starship program since the first full-scale test flight in 2023, which damaged the launch pad before the rocket spun out of control in the upper atmosphere.

Now, SpaceX hopes to get back on track. At the end of last year, company officials said they targeted as many as 25 Starship flights in 2025. Two months in, SpaceX is about to launch its second Starship of the year.

The breakup of Starship last month prevented SpaceX from evaluating the performance of the ship’s Pez-like satellite deployer and upgraded heat shield. Engineers are eager to see how those perform on Monday’s flight. Once in space, the ship will release four simulators replicating the approximate size and mass of SpaceX’s next-generation Starlink Internet satellites. They will follow the same suborbital trajectory as Starship and reenter the atmosphere over the Indian Ocean.

That will be followed by a restart of a Raptor engine on Starship in space, repeating a feat first achieved on Flight 6 in November. Officials want to ensure Raptor engines can reignite reliably in space before actually launching Starship into a stable orbit, where the ship must burn an engine to guide itself back into the atmosphere for a controlled reentry. With another suborbital flight on tap Monday, the engine relight is purely a confidence-building demonstration and not critical for a safe return to Earth.

The flight plan for Starship’s next launch includes another attempt to catch the Super Heavy booster with the launch tower, a satellite deployment demonstration, and an important test of its heat shield. Credit: SpaceX

Then, about 47 minutes into the mission, Starship will plunge back into the atmosphere. If this flight is like the previous few, expect to see live high-definition video streaming back from Starship as super-heated plasma envelops the vehicle in a cloak of pink and orange. Finally, air resistance will slow the ship below the speed of sound, and just 20 seconds before reaching the ocean, the rocket will flip to a vertical orientation and reignite its Raptor engines again to brake for splashdown.

This is where SpaceX hopes Starship Version 2 will shine. Although three Starships have made it to the ocean intact, the scorching temperatures of reentry damaged parts of their heat shields and flaps. That won’t do for SpaceX’s vision of rapidly reusing Starship with minimal or no refurbishment. Heat shield repairs slowed down the turnaround time between NASA’s space shuttle missions, and officials hope the upgraded heat shield on Starship Version 2 will decrease the downtime.

FAA’s green light

The FAA confirmed Friday it issued a launch license earlier this week for Starship Flight 8.

“The FAA determined SpaceX met all safety, environmental and other licensing requirements for the suborbital test flight,” an FAA spokesperson said in a statement.

The federal regulator oversaw a SpaceX-led investigation into the failure of Flight 7. SpaceX said NASA, the National Transportation Safety Board, and the US Space Force also participated in the investigation, which determined that propellant leaks and fires in an aft compartment, or attic, of Starship led to the shutdown of its engines and eventual breakup.

Engineers concluded the leaks were most likely caused by a harmonic response several times stronger than predicted, suggesting the vibrations during the ship’s climb into space were in resonance with the vehicle’s natural frequency. This would have intensified the vibrations beyond the levels engineers expected from ground testing.

Earlier this month, SpaceX completed an extended-duration static fire of the next Starship upper stage to test hardware modifications at multiple engine thrust levels. According to SpaceX, findings from the static fire informed changes to the fuel feed lines to Starship’s Raptor engines, adjustments to propellant temperatures, and a new operating thrust for the next test flight.

“To address flammability potential in the attic section on Starship, additional vents and a new purge system utilizing gaseous nitrogen are being added to the current generation of ships to make the area more robust to propellant leakage,” SpaceX said. “Future upgrades to Starship will introduce the Raptor 3 engine, reducing the attic volume and eliminating the majority of joints that can leak into this volume.”

FAA officials were apparently satisfied with all of this. The agency’s commercial spaceflight division completed a “comprehensive safety review” and determined Starship can return to flight operations while the investigation into the Flight 7 failure remains open. This isn’t new. The FAA also used this safety determination to expedite SpaceX launch license approvals last year as officials investigated mishaps on Starship and Falcon 9 rocket flights.

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Stephen Clark is a space reporter at Ars Technica, covering private space companies and the world’s space agencies. Stephen writes about the nexus of technology, science, policy, and business on and off the planet.

SpaceX readies a redo of last month’s ill-fated Starship test flight Read More »

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Astroscale aced the world’s first rendezvous with a piece of space junk

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Astroscale’s US subsidiary won a $25.5 million contract from the US Space Force in 2023 to build a satellite refueler that can hop around geostationary orbit. Like the ADRAS-J mission, this project is a public-private partnership, with Astroscale committing $12 million of its own money. In January, the Japanese government selected Astroscale for a contract worth up to $80 million to demonstrate chemical refueling in low-Earth orbit.

The latest win for Astroscale came Thursday, when the Japanese Ministry of Defense awarded the company a contract to develop a prototype satellite that could fly in geostationary orbit and collect information on other objects in the domain for Japan’s military and intelligence agencies.

“We are very bullish on the prospects for defense-related business,” said Nobu Matsuyama, Astroscale’s chief financial officer.

Astroscale’s other projects include a life extension mission for an unidentified customer in geostationary orbit, providing a similar service as Northrop Grumman’s Mission Extension Vehicle (MEV).

So, can Astroscale really do all of this? In an era of a militarized final frontier, it’s easy to see the usefulness of sidling up next to a “non-cooperative” satellite—whether it’s to refuel it, repair it, de-orbit it, inspect it, or (gasp!) disable it. Astroscale’s demonstration with ADRAS-J showed it can safely operate near another object in space without navigation aids, which is foundational to any of these applications.

So far, governments are driving demand for this kind of work.

Astroscale raised nearly $400 million in venture capital funding before going public on the Tokyo Stock Exchange last June. After quickly spiking to nearly $1 billion, the company’s market valuation has dropped to about $540 million as of Thursday. Astroscale has around 590 full-time employees across all its operating locations.

Matsuyama said Astroscale’s total backlog is valued at about 38.9 billion yen, or $260 million. The company is still in a ramp-up phase, reporting operating losses on its balance sheet and steep research and development spending that Matsuyama said should max out this year.

“We are the only company that has proved RPO technology for non-cooperative objects, like debris, in space,” Okada said last month.

“In simple terms, this means approach and capture of objects,” Okada continued. “This capability did not exist before us, but one’s mastering of this technology enables you to provide not only debris removal service, but also orbit correction, refueling, inspection, observation, and eventually repair and reuse services.”

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German startup to attempt the first orbital launch from Western Europe

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The nine-engine first stage for Isar Aerospace’s Spectrum rocket lights up on the launch pad on February 14. Credit: Isar Aerospace

Isar builds almost all of its rockets in-house, including Spectrum’s Aquila engines.

“The flight will be the first integrated test of tens of thousands of components,” said Josef Fleischmann, Isar’s co-founder and chief technical officer. “Regardless of how far we get, this first test flight will hopefully generate an enormous amount of data and experience which we can apply to future missions.”

Isar is the first European startup to reach this point in development. “Reaching this milestone is a huge success in itself,” Meltzer said in a statement. “And while Spectrum is ready for its first test flight, launch vehicles for flights two and three are already in production.”

Another Bavarian company, Rocket Factory Augsburg, destroyed its first booster during a test-firing on its launch pad in Scotland last year, ceding the frontrunner mantle to Isar. RFA received its launch license from the UK government last month and aims to deliver its second booster to the launch site for hot-fire testing and a launch attempt later this year.

There’s an appetite within the European launch industry for new companies to compete with Arianespace, the continent’s sole operational launch services provider backed by substantial government support. Delays in developing the Ariane 6 rocket and several failures of Europe’s smaller Vega launcher forced European satellite operators to look abroad, primarily to SpaceX, to launch their payloads.

The European Space Agency is organizing the European Launcher Challenge, a competition that will set aside some of the agency’s satellites for launch opportunities with a new crop of startups. Isar is one of the top contenders in the competition to win money from ESA. The agency expects to award funding to multiple European launch providers after releasing a final solicitation later this year.

The first flight of the Spectrum rocket will attempt to reach a polar orbit, flying north from Andøya Spaceport. Located at approximately 69 degrees north latitude, the spaceport is poised to become the world’s northernmost orbital launch site.

Because the inaugural launch of the Spectrum rocket is a test flight, it won’t carry any customer payloads, an Isar spokesperson told Ars.

German startup to attempt the first orbital launch from Western Europe Read More »

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SpaceX engineers brought on at FAA after probationary employees were fired

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Kiernan is currently a lead software engineer at SpaceX, according to his LinkedIn page. Before joining SpaceX in May 2020, he worked at Wayfair and is a 2017 Dartmouth graduate.

Smeal is a software engineer who has worked at SpaceX since September 2021, according to his LinkedIn. He graduated from Saint Vincent College in 2018.

Glantz is a software engineer who has worked at SpaceX since May 2024 and worked as an engineering analyst at Goldman Sachs from 2019 to 2021, according to his LinkedIn, and graduated from the University of Michigan in 2019.

Malaska, Kiernan, Smeal, and Glantz did not immediately respond to requests for comment. The FAA also did not immediately respond to requests for comment.

In his post on X, Duffy wrote, “Because I know the media (and Hillary Clinton) will claim Elon’s team is getting special access, let me make clear that the @FAANews regularly gives tours of the command center to both media and companies.”

But on Wednesday, FAA acting administrator Chris Rocheleau wrote in an email to FAA staff, viewed by WIRED, that DOGE and the teams of special government employees deployed in federal agencies were “top-of-mind,” before noting that the agency had “recently welcomed” a team of special government employees who had already toured some FAA facilities. “We are asking for their help to engineer solutions while we keep the airspace open and safe,” he wrote, adding that the new employees had already visited the FAA Command Center and Potomac TRACON, a facility that controls the airspace around and provides air traffic control services to airports in the DC, Maryland, and Virginia areas.

In a Department of Transportation all-hands meeting late last week, Duffy responded to a question about DOGE’s role in national airspace matters, and without explicitly mentioning the new employees, suggested help was needed on reforming Notice to Air Mission (NOTAM) alerts, a critical system that distributes real-time data and warnings to pilots but which has had significant outages, one as recently as this month. “If I can get ideas from really smart engineers on how we can fix it, I’m going to take those ideas,” he said, according to a recording of the meeting reviewed by WIRED. “Great engineers” might also work on airspace issues, he said.

SpaceX engineers brought on at FAA after probationary employees were fired Read More »

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In a last-minute decision, White House decides not to terminate NASA employees

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So what changed?

It was not immediately clear why. A NASA spokesperson in Washington, DC, offered no comment on the updated guidance. Two sources indicated that it was plausible that private astronaut Jared Isaacman, whom President Trump has nominated to lead the space agency, asked for the cuts to be put on hold.

Although this could not be confirmed, it seems reasonable that Isaacman would want to retain some control over where cuts at the agency are made. Firing all probationary employees—which is the most expedient way to reduce the size of government—is a blunt instrument. It whacks new hires that the agency may have recruited for key positions, as well as high performers who earned promotions.

The reprieve in these terminations does not necessarily signal that NASA will escape significant budget or employment cuts in the coming months.

The administration could still seek to terminate probationary employees. In addition, Ars reported earlier that directors at the agency’s field centers have been told to prepare options for a “significant” reduction in force in the coming months. The scope of these cuts has not been defined, and it’s likely they would need to be negotiated with Congress.

In a last-minute decision, White House decides not to terminate NASA employees Read More »

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By the end of today, NASA’s workforce will be about 10 percent smaller

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Spread across NASA’s headquarters and 10 field centers, which dot the United States from sea to sea, the space agency has had a workforce of nearly 18,000 civil servants.

However, by the end of today, that number will have shrunk by about 10 percent since the beginning of the second Trump administration four weeks ago. And the world’s preeminent space agency may still face significant additional cuts.

According to sources, about 750 employees at NASA accepted the “fork in the road” offer to take deferred resignation from the space agency later this year. This sounds like a lot of people, but generally about 1,000 people leave the agency every year, so effectively, many of these people might just be getting paid to leave jobs they were already planning to exit from.

The culling of “probationary” employees will be more impactful. As it has done at other federal agencies, the Trump administration is generally firing federal employees who are in the “probationary” period of their employment, which includes new hires within the last one or two years or long-time employees who have moved into or been promoted into a new position. About 1,000 or slightly more employees at NASA were impacted by these cuts.

Adding up the deferred resignations and probationary cuts, the Trump White House has now trimmed about 10 percent of the agency’s workforce.

However, the cuts may not stop there. Two sources told Ars that directors at the agency’s field centers have been told to prepare options for a “significant” reduction in force in the coming months. The scope of these cuts has not been defined, and it’s possible they may not even happen, given that the White House must negotiate budgets for NASA and other agencies with the US Congress. But this directive for further reductions in force casts more uncertainty on an already demoralized workforce and signals that the Trump administration would like to make further cuts.

By the end of today, NASA’s workforce will be about 10 percent smaller Read More »

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Turning the Moon into a fuel depot will take a lot of power

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Getting oxygen from regolith takes 24 kWh per kilogram, and we’d need tonnes.

Without adjustments for relativity, clocks here and on the Moon would rapidly diverge. Credit: NASA

If humanity is ever to spread out into the Solar System, we’re going to need to find a way to put fuel into rockets somewhere other than the cozy confines of a launchpad on Earth. One option for that is in low-Earth orbit, which has the advantage of being located very close to said launch pads. But it has the considerable disadvantage of requiring a lot of energy to escape Earth’s gravity—it takes a lot of fuel to put substantially less fuel into orbit.

One alternative is to produce fuel on the Moon. We know there is hydrogen and oxygen present, and the Moon’s gravity is far easier to overcome, meaning more of what we produce there can be used to send things deeper into the Solar System. But there is a tradeoff: any fuel production infrastructure will likely need to be built on Earth and sent to the Moon.

How much infrastructure is that going to involve? A study released today by PNAS evaluates the energy costs of producing oxygen on the Moon, and finds that they’re substantial: about 24 kWh per kilogram. This doesn’t sound bad until you start considering how many kilograms we’re going to eventually need.

Free the oxygen!

The math that makes refueling from the Moon appealing is pretty simple. “As a rule of thumb,” write the authors of the new study on the topic, “rockets launched from Earth destined for [Earth-Moon Lagrange Point 1] must burn ~25 kg of propellant to transport one kg of payload, whereas rockets launched from the Moon to [Earth-Moon Lagrange Point 1] would burn only ~four kg of propellant to transport one kg of payload.” Departing from the Earth-Moon Lagrange Point for locations deeper into the Solar System also requires less energy than leaving low-Earth orbit, meaning the fuel we get there is ultimately more useful, at least from an exploration perspective.

But, of course, you need to make the fuel there in the first place. The obvious choice for that is water, which can be split to produce hydrogen and oxygen. We know there is water on the Moon, but we don’t yet know how much, and whether it’s concentrated into large deposits. Given that uncertainty, people have also looked at other materials that we know are present in abundance on the Moon’s surface.

And there’s probably nothing more abundant on that surface than regolith, the dust left over from constant tiny impacts that have, over time, eroded lunar rocks. The regolith is composed of a variety of minerals, many of which contain oxygen, typically the heavier component of rocket fuel. And a variety of people have figured out the chemistry involved in separating oxygen from these minerals on the scale needed for rocket fuel production.

But knowing the chemistry is different from knowing what sort of infrastructure is needed to get that chemistry done at a meaningful scale. To get a sense of this, the researchers decided to focus on isolating oxygen from a mineral called ilmenite, or FeTiO3. It’s not the easiest way to get oxygen—iron oxides win out there—but it’s well understood. Someone actually patented oxygen production from ilmenite back in the 1970s, and two hardware prototypes have been developed, one of which may be sent to the Moon on a future NASA mission.

The researchers propose a system that would harvest regolith, partly purify the ilmenite, then combine it with hydrogen at high temperatures, which would strip the oxygen out as water, leaving behind purified iron and titanium (both of which may be useful to have). The resulting water would then be split to feed the hydrogen back into the system, while the oxygen can be sent off for use in rockets.

(This wouldn’t solve the issue of what that oxygen will ultimately oxidize to power a rocket. But oxygen is typically the heavier component of rocket fuel combinations—typically about 80 percent of the mass—and so the bigger challenge to get to a fuel depot.)

Obviously, this process will require a lot of infrastructure, like harvesters, separators, high-temperature reaction chambers, and more. But the researchers focus on a single element: how much power will it suck down?

More power!

To get their numbers, the researchers made a few simplifying assumptions. These include assuming that it’s possible to purify ilmenite from raw regolith and that it will be present in particles small enough that about half the material present will participate in chemical reactions. They ignored both the potential to get even more oxygen from the iron and titanium oxides present, as well as the potential for contamination from problematic materials like hydrogen sulfide or hydrochloric acid.

The team found that almost all of the energy is consumed at three steps in the process: the high-temperature hydrogen reaction that produces water (55 percent), splitting the water afterwards (38 percent), and converting the resulting oxygen to its liquid form (five percent). The typical total usage, depending on factors like the concentration of ilmenite in the regolith, worked out to be about 24 kW-hr for each kilogram of liquid oxygen.

Obviously, the numbers are sensitive to how efficiently you can do things like heat the reaction mix. (It might be possible to do this heating with concentrated solar, avoiding the use of electricity for this entirely, but the authors didn’t analyze that.) But it was also sensitive to less obvious efficiencies. For example, a better separation of the ilmenite from the rest of the regolith means you’re using less energy to heat contaminants. So, while the energetic cost of that separation is small, it pays off to do it effectively.

Based on orbital observations, the researchers map out the areas where ilmenite is present at high enough concentrations for this approach to make sense. These include some of the mares on the near side of the Moon, so they’re easy to get to.

A map of the lunar surface with locations highlighted in color.

A map of the lunar surface, with areas with high ilmenite concentrations shown in blue.

Credit: Leger, et. al.

A map of the lunar surface, with areas with high ilmenite concentrations shown in blue. Credit: Leger, et. al.

On its own, 24 kWh doesn’t seem like a lot of power. The problem is that we will need a lot of kilograms. The researchers estimate that getting an empty SpaceX Starship from the lunar surface to the Earth-Moon Lagrange Point takes 80 tonnes of liquid oxygen. And a fully fueled starship can hold over 500 tonnes of liquid oxygen.

We can compare that to something like the solar array on the International Space Station, which has a capacity of about 100 kW. That means it could power the production of about four kilograms of oxygen an hour. At that rate, it’ll take a bit over 10 days to produce a tonne, and a bit more than two years to get enough oxygen to get an empty Starship to the Lagrange Point—assuming 24-7 production. Being on the near side, they will only produce for half the time, given the lunar day.

Obviously, we can build larger arrays than that, but it boosts the amount of material that needs to be sent to the Moon from Earth. It may potentially make more sense to use nuclear power. While that would likely involve more infrastructure than solar arrays, it would allow the facilities to run around the clock, thus getting more production from everything else we’ve shipped from Earth.

This paper isn’t meant to be the final word on the possibilities for lunar-based refueling; it’s simply an early attempt to put hard numbers on what ultimately might be the best way to explore our Solar System. Still, it provides some perspective on just how much effort we’ll need to make before that sort of exploration becomes possible.

PNAS, 2025. DOI: 10.1073/pnas.2306146122 (About DOIs).

Photo of John Timmer

John is Ars Technica’s science editor. He has a Bachelor of Arts in Biochemistry from Columbia University, and a Ph.D. in Molecular and Cell Biology from the University of California, Berkeley. When physically separated from his keyboard, he tends to seek out a bicycle, or a scenic location for communing with his hiking boots.

Turning the Moon into a fuel depot will take a lot of power Read More »

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NASA nominee previews his vision for the agency: Mars, hard work, inspiration

jared isaacman, NASA, Space / /

“When I see a picture like this, it is impossible not to feel energized about the future,” he wrote. “I think it is so important for people to understand the profound implications of sending humans to another planet.”

Among these, Isaacman cited the benefits of advancing state-of-the-art technologies including propulsion, habitability, power generation, in-situ resource utilization, and manufacturing.

“We will create systems, countermeasures, and pharmaceuticals to sustain human life in extreme conditions, addressing challenges like radiation and microgravity over extended durations,” he said. “These advancements will form the foundation for lower-cost, more frequent crewed and robotic missions across the solar system, creating a flywheel effect to accelerate world-changing discoveries.”

Additionally, Isaacman said taking the first steps toward humanity living beyond Earth was critical to the long-term survival of the species, and that such an achievement would inspire a new generation of scientific and technological leaders.

“Achieving such an outrageous endeavor—like landing American astronauts on another planet—will inspire generations of dreamers to build upon these accomplishments, set even bolder goals, and drive humankind’s greatest adventure forward,” he wrote.

Upon being asked about his thoughts about sending humans to Mars during the launch window in late 2028 or early 2029, Isaacman said he remains on the outside of NASA’s planning process for now. But he did say the United States should start to put serious effort toward sending humans to Mars.

“We should invest a reasonable amount of resources coupled with extreme work intensity and then make them a reality,” he wrote. “Even getting 90% there in the near term would set humankind on an incredible trajectory for the long term.”

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Rocket Report: A blue mood at Blue; Stoke Space fires a shot over the bow

rocket report, Space / /

All the news that’s fit to lift

“Rapid turnaround isn’t merely a goal, it’s baked into the design.”

A bottoms-up view of Stoke Space’s Andromeda upper stage. Credit: Stoke Space

A bottoms-up view of Stoke Space’s Andromeda upper stage. Credit: Stoke Space

Welcome to Edition 7.31 of the Rocket Report! The unfortunate news this week concerns layoffs. Blue Origin announced a 10 percent cut in its workforce as the company aims to get closer to breaking even. More broadly in the space industry, there is unease about what the Trump administration’s cuts to NASA and other federal agencies might mean.

We don’t have all the answers, but it does seem that NASA is likely to be subject to less deep cuts than some other parts of the government. We should find out sometime in March when the Trump White House submits its initial budget request. Congress, of course, will have the final say.

As always, we welcome reader submissions, and if you don’t want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets as well as a quick look ahead at the next three launches on the calendar.

PLD Space continues to grow. The Spain-based launch company said this week that it now has more than 300 employees as it works toward an orbital launch attempt. “In this race for space supremacy, the amount of capital raised and the talent gathered have become key indicators of a company’s potential for success,” the company said. “While capital acts as the fuel for these ambitious initiatives, the talent behind it is the catalyst that drives them.”

Working to reach orbit … The average age of employees at PLD Space is 34, and the company is hiring 15 people a month as it works to develop the Miura 5 rocket. It’s unclear which of the commercial launch startups in Europe will succeed, but PLD Space has a decent chance to be among them. With luck, the Miura 5 launch vehicle will make its debut sometime in 2026.

Will NASA launch on a Transporter mission? NASA announced this week that it has selected SpaceX to launch a small exoplanet science mission as a rideshare payload as soon as September, Space News reports. The task order to launch the Pandora mission was made through the Venture-class Acquisition of Dedicated and Rideshare launch services contract, intended for small missions with higher acceptance of risk.

Could fly on a Falcon 9 … Pandora is an ESPA Grande-class spacecraft, a category that includes spacecraft weighing up to 320 kilograms, and is designed to operate in a Sun-synchronous orbit. That suggests Pandora could launch on SpaceX’s Transporter series of dedicated rideshare missions that send payloads to such orbits, but neither NASA nor SpaceX disclosed specifics. The NASA announcement also did not disclose the value of the task order to SpaceX.

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Stoke Space dishes on Andromeda upper stage. The Washington-based launch company has revealed the name of its Nova rocket’s upper stage, Andromeda, and provided some new details about the design. Andromeda will incorporate hot staging, Stoke says, and will use fewer but larger thrusters—24 instead of 30. The upper stage is now mounted on Stoke’s test stand in Moses Lake, Washington, the company said.

Hot staging, hot talk … The new design is focused on rapid reusability, with easier access and serviceability to components of the engines and heat shield. “These changes further reduce complexity and allow the entire engine to be serviced—or even replaced—within hours or minutes. Rapid turnaround isn’t merely a goal, it’s baked into the design,” the company said. The upper stage will also incorporate “hot staging” to improve the capacity to orbit. You’ve got to appreciate the subtle dig at SpaceX’s Starship program, too: the design allows for hot staging “without the need for a heavy one-time-use interstage shield to protect Stage 1.” Shots fired!

European space commissioner worried about launch. During a keynote address at the Perspectives Spatiales 2025 event in Paris, European Commissioner for Defence Industry and Space Andrius Kubilius outlined the challenging position the continent’s space sector finds itself in, European Spaceflight reports. “Commercial sales are down. Exports are down. Profits are down. And this comes at a time when we need space more than ever. For our security. For our survival.”

Actions, not words, needed … Rhetorical language and bold declarations are inspiring, but when it comes to securing Europe’s place in the global space race, adopted policy and appropriated funding are where aspirations are tested, the European publication stated. Without concrete investments, streamlined regulations, and clear strategic priorities, Europe’s ambition to once again lead the global launch market is likely to amount to little.

Election set to create Starbase, the city. A Texas county on Wednesday approved holding an election sought by SpaceX that would let residents living around the company’s launch and production facilities in South Texas decide whether to formally create a new city called Starbase, ABC News reports. The election was set for May 3, and votes can only be cast by residents living near the launch site, which is currently part of an unincorporated area of Cameron County located along the US-Mexico border. Approval is expected.

A busy beehive … In December, more than 70 area residents signed a petition requesting an election to make Starbase its own municipality. Cameron County Judge Eddie Treviño said the county reviewed the petition and found it met the state’s requirements for the incorporation process to move forward. Kathy Lueders, Starbase’s general manager, has previously said that the incorporation would streamline certain processes to build amenities in the area. More than 3,400 full-time SpaceX employees and contractors work at the site. (submitted by teb)

China taps into commercial space for station missions. China will launch a pair of low-cost space station resupply spacecraft this year on new commercial launch vehicles, Space News reports. The Haolong cargo space shuttle from the Chengdu Aircraft Design Institute will launch on Landspace’s Zhuque-3. The reusable stainless steel, methane-liquid oxygen Zhuque-3 rocket is due to have its first flight in the third quarter of this year. The reusable Haolong vehicle will be 10 meters in length, around 7,000 kilograms in mass, and capable of landing on a runway.

Following a commercial trail laid by NASA … Meanwhile, the Qingzhou cargo spacecraft from the Innovation Academy for Microsatellites of the Chinese Academy of Sciences will launch on the first flight of the CAS Space Kinetica-2 (Lijian-2) rocket no earlier than September. The development is analogous to NASA’s Commercial Resupply Services program, diversifying China’s options for supplying the Tiangong space station. If even one of these missions takes place successfully within the next year, it would represent a major step forward for China’s quasi-commercial space program. (submitted by EllPeaTea)

H3 rocket launches its fifth mission. Japan’s flagship H3 rocket successfully launched the Michibiki 6 navigation satellite early Sunday, enhancing the country’s regional GPS capabilities, Space News reports. The launch was Japan’s first of 2025 and suggests that the relatively new H3 rocket is starting to hit its stride.

Getting up to speed … The expendable launcher’s inaugural launch in March 2023, after numerous delays, suffered a second-stage engine failure, leading controllers to issue a destruct command to destroy the stage and its ALOS-3 payload. Since then, it has had a successful run of launches, most recently the Kirameki 3 communications satellite for defense purposes in November last year. (submitted by EllPeaTea)

Blue Origin lays off 10 percent of its employees. A little less than a month after the successful debut of its New Glenn rocket, Blue Origin’s workforce will be trimmed by 10 percent, Ars reports. The cuts were announced during an all-hands meeting on Thursday morning led by the rocket company’s chief executive, Dave Limp. During the gathering, Limp cited business strategy as the rationale for making the cuts to a workforce of more than 10,000 people.

Growing too fast … “We grew and hired incredibly fast in the last few years, and with that growth came more bureaucracy and less focus than we needed,” Limp wrote in an email to the entire workforce after the meeting. Even before Thursday’s announcement, Blue Origin sought to control costs. According to sources, the company has had a hiring freeze for the last six months. And in January, it let the majority of its contractors go. Layoffs suck—here’s hoping that those let go this week find a soft landing.

Speaking of Blue, they’re targeting spring for next launch. Blue Origin expects to attempt its second New Glenn launch in late spring after correcting problems that prevented the booster from landing on the first launch last month, Space News reports. Speaking at the 27th Annual Commercial Space Conference on Wednesday, Dave Limp suggested a propulsion issue caused the loss of the New Glenn booster during its landing attempt on the Jan. 16 NG-1 launch.

Understanding the issues … “We had most of the right conditions in the engine but we weren’t able to get everything right to the engine from the tanks,” Limp said. “We think we understand what the issues are.” A second booster is in production. “I don’t think it’s going to delay our path to flight,” Limp said of the investigation. “I think we can still fly late spring.” June seems overly optimistic. One source with knowledge of the second booster’s production said October might be a more reasonable timeframe for the second launch.

Boeing warns of potential SLS workforce cuts. The primary contractor for the Space Launch System rocket, Boeing, is preparing for the possibility that NASA cancels the long-running program, Ars reports. Last Friday, with less than an hour’s notice, David Dutcher, Boeing’s vice president and program manager for the SLS rocket, scheduled an all-hands meeting for the approximately 800 employees working on the program. The apparently scripted meeting lasted just six minutes, and Dutcher didn’t take questions. Afterward, Ars learned that NASA was not informed the meeting would take place.

Waiting on the president’s budget request … During his remarks, Dutcher said Boeing’s contracts for the rocket could end in March and that the company was preparing for layoffs in case the contracts with the space agency were not renewed. The aerospace company, which is the primary contractor for the rocket’s large core stage, issued the notifications as part of the Worker Adjustment and Retraining Notification (or WARN) Act. The timing of Friday’s hastily called meeting aligns with the anticipated release of President Trump’s budget proposal for fiscal year 2026, which should signal the administration’s direction on the SLS rocket.

Space Force is still waiting on Vulcan. Last October, United Launch Alliance started stacking its third Vulcan rocket on a mobile launch platform in Florida in preparation for a mission for the US Space Force by the end of the year. However, that didn’t happen, Ars reports. Now, ULA is still awaiting the Space Force’s formal certification of its new rocket, further pushing out delivery schedules for numerous military satellites booked to fly to orbit on the Vulcan launcher.

Falling short of ambitious goals … In fact, ULA has started to take the rocket apart. This involves removing the rocket’s Centaur upper stage, interstage adapter, and booster stage from its launch mount. Instead, ULA will now focus on launching a batch of Project Kuiper satellites for Amazon on an Atlas V rocket in the next couple of months before pivoting back to Vulcan. ULA hoped to launch as many as 20 missions in 2025, with roughly an even split between its new Vulcan rocket and the Atlas V heading for retirement. Clearly, this now won’t happen.

Next three launches

Feb. 15: Falcon 9 | Starlink 12-8 | Cape Canaveral Space Force Station, Florida | 06: 14 UTC

Feb. 17: Falcon 9 | NROL-57 | Vandenberg Space Force Base, California | 13: 18 UTC

Feb. 18: Falcon 9 | Starlink 10-12 | Cape Canaveral Space Force Station, Florida | 23: 00 UTC

Photo of Eric Berger

Eric Berger is the senior space editor at Ars Technica, covering everything from astronomy to private space to NASA policy, and author of two books: Liftoff, about the rise of SpaceX; and Reentry, on the development of the Falcon 9 rocket and Dragon. A certified meteorologist, Eric lives in Houston.

Rocket Report: A blue mood at Blue; Stoke Space fires a shot over the bow Read More »