Tag: ISS

Russia launches Progress freighter to ISS

1:04 pm

Russia today (July 4th in Kazakhstan) successfully launched a new Progress freighter to ISS, its Soyuz-2 rocket lifting off from the Baikonur spaceport in Kazakhstan.

The freighter will dock to ISS in two days, bringing with it almost three tons of cargo and more than a half done of hardware and equipment. Expect NASA to order its astronauts to shut the hatch between the American and Russian sections of ISS due its fear that a docking to the Zvezda module could cause a catastrophic failure because of the stress fractures in that module’s hull. That docking will however not be directly to Zvezda, but to the Poisk module that is itself docked to Zvezda.

The lower stages and strap-on boosters crashed inside Kazakhstan in the normal drop zones that Russia has used for decades.

The leaders in the 2025 launch race:

84 SpaceX
36 China
10 Rocket Lab
8 Russia

SpaceX still leads the rest of the world in successful launches, 84 to 63.

Russia’s launch pace this year is its lowest pace in decades. At this rate Russia might only get about 15-17 launches off in 2025, a count more comparable to what it did in the very early 1960s. This decline can be directly linked to the Russian invasion of the Ukraine. That invasion caused Russia to lose billions in contracts in the international launch market. And it continues to prevent Russia from winning any new international contracts as well. Except for its government launches (which are limited due to government cash shortages), the only other missions Russia flies are those to ISS, and those number about four per year.

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SpaceX launches Axiom’s fourth commercial manned mission to ISS

8:45 am

SpaceX last night successfully launched Axiom’s fourth commercial manned mission to ISS, dubbed Ax-4, its Falcon 9 rocket lifting off from the Kennedy Space Center in Florida.

The first stage completed its second flight, landing back at Cape Canaveral. The Dragon capsule, the newest and fifth ship in SpaceX’s fleet of manned capsule, was dubbed “Grace,” as announced by Axiom mission commander and former NASA astronaut Peggy Whitson. The three paying passengers are government astronauts from India, Hungary, and Poland.

The capsule will dock with ISS tomorrow (Thursday) at 7 am (Eastern), where it and its crew will spend about one to two weeks before returning to Earth.

The leaders in the 2025 launch race:

79 SpaceX
35 China
8 Rocket Lab
7 Russia

SpaceX now leads the rest of the world in successful launches, 79 to 58.

The overall lack of excitement about this manned space mission speaks directly to how successful SpaceX has become as a private commercial rocket company. Its rockets and capsules work routinely well, with almost no problems, making these manned space missions seem as boring as an airline trip from New York to Washington.

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NASA sets another new date for Axiom’s Ax-4 commercial manned mission to ISS

9:21 am

NASA today announced a new launch date of June 25, 2025 for Axiom’s Ax-4 commercial manned mission to ISS carrying a three passengers from India, Poland, and Hungary respectively and commanded by former NASA astronaut Peggy Whitson (now working for Axiom).

As with previous announcements, the information provided was sparse:

NASA, Axiom Space, and SpaceX are targeting 2:31 a.m. EDT, Wednesday, June 25, for launch of the fourth private astronaut mission to the International Space Station, Axiom Mission 4.

The mission will lift off from Launch Complex 39A at NASA’s Kennedy Space Center in Florida. The crew will travel to the orbiting laboratory on a new SpaceX Dragon spacecraft after launching on the company’s Falcon 9 rocket. The targeted docking time is approximately 7 a.m. Thursday, June 26. NASA will provide more details and its coverage information shortly.

The launch had previously been delayed several times because NASA and Russia wanted to first assess the repair work on the leaks in the Russian Zvezda module before allowing another docking at the station. No information however has been released so far detailing that assessment. Though there have been indications that the loss of air in ISS was stopped by the repair, neither NASA nor Roscosmos have provided any specific data.

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NASA delays Axiom manned mission again

9:11 am

Without providing any specific details, NASA today announced that it has once again scrubbed the June 22, 2025 launch of Axiom’s Ax-4 manned mission to ISS as it assesses the Russian repairs to the air leaks in the Russian Zvezda module.

The space agency needs additional time to continue evaluating International Space Station operations after recent repair work in the aft (back) most segment of the orbital laboratory’s Zvezda service module. Because of the space station’s interconnected and interdependent systems, NASA wants to ensure the station is ready for additional crew members, and the agency is taking the time necessary to review data.

No new launch date has been set. Because the agency provides so little specific information, we don’t know if the air leak repairs are working, are failing, or have indicated even more serious problems that make any station docking a greater risk. Almost certainly, this latter fear is unfounded and the repairs have succeeded in stopping or slowing the loss of air, but the paucity of information from NASA allows for wild speculations. It would be better if the agency told us what it has so far learned, and exactly why that knowledge requires it to extend the data-gathering time period.

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NASA/Axiom announce another four-day launch delay for Axiom’s fourth manned mission

8:55 am

NASA and Axiom today announced that they have rescheduled the launch of Axiom’s fourth manned mission to ISS, dubbed Ax-4, to June 22, 2025 in order to give Russian and American engineers more time to assess the leak repairs in the station’s Russian Zvezda module.

The press announcement provided little information, simply stating that:

The change in a targeted launch date provides NASA time to continue evaluating space station operations after recent repair work in the aft (back) most segment of the International Space Station’s Zvezda service module.

It would be nice if the agency would release some actual data. Earlier reports had suggested that the repairs had completely sealed the leaks and that the station was no longer losing air. The vagueness of today’s report suggests that the repairs might not have been as successful as hoped. It could also be engineers simply want more data for a longer period to prove the repairs have worked.

The lack of detailed information causes unnecessary speculation.

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Axiom manned flight to ISS rescheduled; NASA attempts to clarify ISS leak situation

9:26 am

In a NASA update today, it announced a new launch date of June 19, 2025 for Axiom’s fourth manned flight to ISS while also attempting to clarify ISS leak situation that caused this last and more extended delay.

On June 12, NASA and Axiom Space delayed the mission as the agency continued to work with Roscosmos to understand the most recent repair efforts to seal small leaks. The leaks, located in the aft (back) most segment of the International Space Station’s Zvezda service module, have been monitored by flight controllers for the past few years.

Following the most-recent repair, pressure in the transfer tunnel has been stable. Previously, pressure in this area would have dropped. This could indicate the small leaks have been sealed. Teams are also considering the stable pressure could be the result of a small amount of air flowing into the transfer tunnel across the hatch seal from the main part of space station. By changing pressure in the transfer tunnel and monitoring over time, teams are evaluating the condition of the transfer tunnel and the hatch seal between the space station and the back of Zvezda.

It appears, though NASA doesn’t say so directly, that the Russians did not wish to change the situation at ISS with another docking — even if it was a docking on the American half of the station — while it was evaluating these leak repairs. It now appears they have gotten enough data to allow NASA to set a new launch date later this week.

If the repairs have managed to stop the leaks this is excellent news. At the same time, it doesn’t reduce the risks of a catastrophic failure of Zvezda, since the existence of these numerous stress fractures in its hull suggest a chronic long term failure that can only worsen with time.

The sudden delay of Axiom’s AX-4 last week also indicates poor coordination between NASA and Roscosmos. It was as if NASA had no idea the repair work was occurring, either because it wasn’t paying attention to what the Russians were doing or because the Russians had kept this work secret until it was completed. In either case, this is not how such a partnership should operate.

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Axiom manned mission delayed further because of new Zvezda leaks on ISS

8:58 am

Figure 3 from September Inspector General report
Figure 3 from September Inspector General report, showing Zvezda’s location on ISS.

According to a press update today by NASA, the launch of the commercial Ax-4 manned mission to ISS has been further delayed due to work by the Russians attempting to seal new leaks in the station’s Zvezda module.

NASA and Axiom Space are postponing the launch of Axiom Mission 4 to the International Space Station. As part of an ongoing investigation, NASA is working with Roscosmos to understand a new pressure signature, after the recent post-repair effort in the aft most segment of the International Space Station’s Zvezda service module.

Cosmonauts aboard the space station recently performed inspections of the pressurized module’s interior surfaces, sealed some additional areas of interest, and measured the current leak rate. Following this effort, the segment now is holding pressure.

In other words, the Russians had recently detected an increase in leakage in the module, identified several more cracks inside Zvezda, and have been working to seal them.

The graphic above comes from a 2024 NASA inspector general report, which at that time noted a significant increase in the leak rate in 2024 (see the data in the lower right). Since then it has been NASA policy to close the hatch that connects the American and Russian sections of the station whenever anything docks with Zvezda, due to risk that the docking could cause the module to fail entirely.

Zvezda is one of the oldest modules on ISS, built in the late 1980s and launched in 2000. It is believed the leaks are due to stress fractures in its hull due to the many dockings and undockings that have occurred at its aft docking port.

If the NASA press release can be believed, the situation is under control and the repairs have been successful. If so, expect the Axiom mission to be rescheduled shortly.

If not, we could be witnessing the beginning of the end of ISS, five years earlier than planned by bureaucrats in Washington and Moscow.

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Axiom’s fourth commercial manned mission scrubbed due to leak

8:04 pm

Axiom and SpaceX have scrubbed the launch tomorrow of Axiom’s fourth commercial manned mission to ISS due to an oxygen leak detected during the standard prelaunch static fire test.

NASA, Axiom Space, and SpaceX are standing down from the launch opportunity on Wednesday, June 11, of Axiom Mission 4 to the International Space Station to allow additional time for SpaceX teams to repair a liquid oxygen leak identified during post-static fire Falcon 9 rocket inspections. A new launch date for the fourth private astronaut mission will be provided once repair work is complete, pending range availability.

There a number of launches already scheduled for Florida in the next few days, so it could be that the launch of Ax-4 could be delayed by more than a few days.

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Axiom charges $70 million per ticket to fly to ISS

9:08 am

Axiom's new module assembly sequence
Axiom’s assembly sequence for its planned station, initially attached to ISS but subsequently detached

According to this article today about Axiom’s tourist flights to ISS, the company now charges $70 million per ticket, which means that for the AX-4 flight scheduled for launch tomorrow, the revenues from India, Poland, and Hungary total about $210 million.

That money of course doesn’t all end up in Axiom’s pockets. It has to pay SpaceX for the launch and use of the Dragon capsule. It also has to pay NASA some recently imposed high fees to use its astronaut training facilities as well as lease time on ISS.

All told, I suspect Axiom’s profits for these flights is relatively small. The company however has other reasons to fly these missions. It is attempting to win NASA’s big space station construction contract, and these flights to ISS demonstrate the company’s ability to manage such operations while working with NASA. Of the other three space station projects competing for that contract, only Vast is planning to do the same.

This effort by these two companies is part of the reason I rank them first and second for winning that contract.

  • Haven-1, being built by Vast, with no NASA funds. The company is moving fast, with Haven-1 to launch and be occupied in 2026 for an estimated 30 days total. It hopes this actual hardware and manned mission will put it in the lead to win NASA’s phase 2 contract, from which it will build its much larger mult-module Haven-2 station..
  • Axiom, being built by Axiom, has launched three tourist flights to ISS, with a fourth scheduled for tomorrow, carrying passengers from India, Hungary, and Poland. Though there have been rumors it has cash flow issues, development of its first module has been proceeding more or less as planned.
  • Orbital Reef, being built by a consortium led by Blue Origin and Sierra Space. Overall, Blue Origin has built almost nothing, while Sierra Space has successfully tested its inflatable modules, including a full scale version, and appears ready to start building its module for launch.
  • Starlab, being built by a consortium led by Voyager Space, Airbus, and Northrop Grumman, with an extensive partnership agreement with the European Space Agency. It recently had its station design approved by NASA, but it has built nothing. This might change once it obtains several hundred million dollars from its initial public offering of stock.
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Axiom’s fourth commercial passenger flight to ISS delayed another two days

9:45 am

NASA, Axiom, and SpaceX yesterday announced that the launch of Axiom’s fourth commercial passenger flight to ISS, dubbed Ax-4, has been delayed two days to June 10, 2025.

NASA, Axiom Space, and SpaceX are targeting no earlier than 8:22 a.m. EDT on Tuesday, June 10, for launch of the fourth private astronaut mission to the International Space Station, Axiom Mission 4. This shift allows teams to account for predicted inclement weather during the SpaceX Falcon 9 rocket and Dragon spacecraft transport in addition to completing final processing of the spacecraft ahead of launch.

The Dragon capsule for this mission is new, and there had been delays in getting it built. Though weather is likely the biggest reason for this delay, it also sounds as if SpaceX has needed just a little bit of extra time to finalize the capsule’s construction.

The mission will fly one Axiom astronaut plus three passengers, each a government astronaut from India, Poland, and Hungary. It will spend about a week docked at ISS.

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Cargo Dragon splashes down and is recovered successfully

2:29 pm

A SpaceX cargo Dragon capsule was recovered successfully earlier today after it splashed down off the coast of California.

The spacecraft carried back to Earth about 6,700 pounds of supplies and scientific experiments designed to take advantage of the space station’s microgravity environment after undocking at 12:05 p.m., May 23, from the zenith port of the space station’s Harmony module.

Some of the scientific hardware and samples Dragon will return to Earth include MISSE-20 (Multipurpose International Space Station Experiment), which exposed various materials to space, including radiation shielding and detection materials, solar sails and reflective coatings, ceramic composites for reentry spacecraft studies, and resins for potential use in heat shields. Samples were retrieved on the exterior of the station and can improve knowledge of how these materials respond to ultraviolet radiation, atomic oxygen, charged particles, thermal cycling, and other factors.

Other cargo returned included a robot hand that tested its grasping and handling capabilities in weightlessness, as well as other experiments.

The capsule itself spent three months in orbit after launching at the end of April.

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Cargo Dragon undocks from ISS

2:55 pm

That this story is not news anymore is really the story. A cargo Dragon capsule that has been docked to ISS since April 22, 2025 today undocked successfully and is scheduled to splashdown off the coast of California on Sunday, May 25, 2025 in the early morning hours.

SpaceX’s Dragon missions to ISS have become so routine that NASA is not even planning to live stream the splashdown, posting updates instead online. This is not actually a surprise, since NASA has practically nothing to do with the splashdown. Once the capsule undocked from ISS, its operation and recovery is entirely in the hands of SpaceX, a private American company.

For NASA, SpaceX is acting as its UPS delivery truck, bringing back to several tons of experiments. And like all UPS delivery trucks, making a delivery is not considered news.

And yet, this is a private commercial spacecraft returning from space, after completing a profitable flight for its owners! That this is now considered so routine that it doesn’t merit much press coverage tells us that the industry of space is beginning to mature into something truly real and sustainable, irrelevant to government.

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Space station startup Voyager Technologies about to go public

10:52 am

Starlab design in 2025
The Starlab design in 2025. Click
for original image.

The space station startup Voyager Technologies (formerly Voyager Space) has filed its paperwork for its expected initial public offering (IPO) of stock as it competes for a major contract from NASA to build its Starlab space station.

Voyager filed a preliminary prospectus for its planned initial public offering (IPO) with the U.S. Securities and Exchange Commission May 16. The company previously confidentially filed plans for its IPO with the SEC. The draft prospectus does not yet disclose how many shares the company plans to sell or the amount the company expects to raise in the IPO. It does, though, offer financial details about Voyager.

The company reported $144.2 million in revenue in 2024 and a net loss of $65.6 million, versus $136.1 million in revenue and a net loss of $25.2 million in 2023. The company also reported revenue of $34.5 million in the first quarter of 2025, and a net loss of $27.9 million.

This story actually made me less confident about this company’s plans, with this quote the most revealing:

The company received a funded Space Act Agreement from NASA to support initial design work on the station, currently worth $217.5 million with $70.3 million yet to be paid. … The NASA award covers only initial work on Starlab, and the company will have to compete for a second phase of NASA’s Commercial Low Earth Orbit Development program that will offer additional funding for station development. Voyager revealed in the prospectus that it projects Starlab to cost $2.8 billion to $3.3 billion to develop.

So far it appears Voyager has built nothing. Instead it has used NASA’s preliminary money to do and redo its on-paper design of Starlab (compare the more recent design concept in the image on the right with this older image from 2022), which as a concept is intended to be launched whole on a single Starship launch. No metal has been cut. The company appears to be following the old big space company approach of investing nothing of its own in development.

This does not mean its station will be a failure, but I expect it will not launch as scheduled in 2029 if it wins that major NASA contract. The company will have to build it all in less than three years, something that I doubt it will be able to do.

My present rankings for the four proposed commercial stations:

  • Haven-1, being built by Vast, with no NASA funds. The company is moving fast, with Haven-1 to launch and be occupied in 2026 for an estimated 30 days total. It hopes this actual hardware and manned mission will put it in the lead to win NASA’s phase 2 contract, from which it will build its much larger mult-module Haven-2 station..
  • Axiom, being built by Axiom, has launched three tourist flights to ISS, with a fourth scheduled for early June, carrying passengers from India, Hungary, and Poland. Though there have been rumors it has cash flow issues, development of its first module has been proceeding more or less as planned.
  • Orbital Reef, being built by a consortium led by Blue Origin and Sierra Space. Overall, Blue Origin has built almost nothing, while Sierra Space has successfully tested its inflatable modules, including a full scale version, and appears ready to start building its module for launch.
  • Starlab, being built by a consortium led by Voyager Space, Airbus, and Northrop Grumman, with an extensive partnership agreement with the European Space Agency. It recently had its station design approved by NASA, but it has built nothing, and appears unwilling to cut any metal until it wins NASA’s full contract.
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Axiom’s next commercial manned flight to ISS delayed at least one week

9:06 am

NASA and Axiom have delayed the launch of the company’s fourth commercial manned flight to ISS by at least a week, from May 29 to June 8, at the earliest.

The NASA press announcement was decidedly vague about the reason:

After reviewing the International Space Station flight schedule, NASA and its partners are shifting launch opportunities for several upcoming missions. The schedule adjustments provide more time to finalize mission plans, spacecraft readiness, and logistics.

This report speculates that SpaceX might have had additional issues getting its brand new manned Dragon capsule ready on time, without out any clear evidence. The capsule has taken longer to build than originally predicted, but giving SpaceX one extra week seems insufficient if the capsule had some outstanding technical issues.

More likely it is exactly as NASA states, the delay is to accommodate the complex coming and going of vehicles to ISS.

The mission will launch one Axiom command pilot and three passengers, government astronauts from India, Poland, and Hungary.

This new manned Dragon, as yet unnamed, will bring SpaceX’s fleet of manned capsules to five, assuming it does not retire one of the older capsules. The company will thus have the largest manned spacecraft fleet ever, exceeding NASA’s four shuttle fleet that existed in the 1990s.

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Astronaut Don Pettit, 70, wants to fly more missions in space

10:54 am

Despite his apparent significant discomfit upon landing last week after seven months in orbit, American astronaut Don Pettit is still eager to fly more times in space, despite celebrating his 70th birthday on the day he returned from ISS.

Pettit landed in Kazakhstan with his two Russian Soyuz MS-26 crewmates on April 20, 2025 local time in Kazakhstan, his 70th birthday. Cameras cut away as he was extracted from the capsule, raising concerns about his health. During a post-mission briefing today he explained that “I was right in the middle of emptying the contents of my stomach onto the steppes of Kazakhstan” and the cameraman kindly gave him the privacy he needed. He added that his body reacts to the return to Earth about the same way every time regardless of duration.

He looked fit today, just a week later.

At the briefing Pettit noted how returning to Earth can be very discomfiting, but with a little effort and time recovery occurs. He also noted how weightlessness is wonderful for older humans.

“I love being in space,” he said. “When you’re sleeping, you’re just floating, and your body, all those little aches and pains heal up. You feel like you’re 30 years old again and free of pain, free of everything. So I love being on orbit. It’s a great place to be for me and my physiology.”

Whether Pettit gets another flight is unclear. There are a lot of medical research reasons to fly an older individual like him in space. Whether NASA wants to do it is another question. The agency has generally been very timid about doing such things.

Pettit also claimed at this briefing that ISS could fly well past 2030, and shouldn’t be de-orbited then as planned. He however likely spent almost all his time in orbit on the American half, and likely has limited information about the stress fractures in the Russian Zvezda module.

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Axiom signs deal with medical company to do diabetes monitor research on its next manned mission to ISS

11:53 am

Axiom today announced it has signed a deal with the medical company Burjeel Holdings to fly and test a glucose monitor during its May 2025 AX-4 manned mission to ISS.

The Ax-4 mission will utilize Continuous Glucose Monitors (CGMs), which have become the standard for glucose monitoring in individuals with diabetes. These devices will be tested to ensure their accuracy in microgravity, providing real-time data that will ultimately support the health of astronauts with insulin-dependent diabetes.The comprehensive preflight, inflight, and post flight protocols will employ various testing methods to validate these technologies. The Ax-4 mission also plans to look at insulin exposure in microgravity to assess the potency and stability of the drug product upon its return to Earth.

Testing the behavior of CGMs and insulin delivery technologies in microgravity and with circadian rhythm disruption is expected to advance the understanding of how such innovations can improve diabetes monitoring and care in remote or under served areas on Earth. Experts say this research will lay the groundwork for managing diabetes in isolated locations, such as oil rigs, deserts, or rural regions.

These tests will also make it possible for people who have diabetes to go into space. For Axiom, this will help widen its customer base. For Burjeel it proves its monitors can work in many remote and hostile environments, also widening its customer base.

Hat tip BtB’s stringer Jay, who adds that “This is cool since this is two companies and no NASA/government involvement.”

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SpaceX launches cargo Dragon to ISS; Problems with Tenacity?

8:55 am

Early this morning SpaceX successfully launched a cargo Dragon to ISS, its Falcon 9 rocket lifting off from the Kennedy Space Center in Florida.

The first stage completed its fifth flight, landing back at Kennedy. The capsule is on its fifth flight, and is carrying significantly more cargo than previous SpaceX cargo missions because it has had to replace much of the cargo that would have been launched on a Cygnus capsule whose launch was cancelled because it had been damaged during transport.

Furthermore, as part of their updates on this mission NASA officials revealed that Sierra Space’s cargo mini-shuttle, Tenacity, is facing more delays, and is now not expected to launch until late this year. This Dream Chaser spacecraft had begun ground testing early in 2024, with a first launch planned for shortly thereafter. For reasons that have not been explained, that ground testing has now been going on for more than a year, and will apparently continue for most of 2025. My guess is that the spacecraft has experienced engineering problems during that testing, and has required fixes that neither Sierra Space nor NASA wishes to reveal.

The result has been that NASA has had a shortage of cargo vehicles to keep ISS supplied. A significant number of science experiments had to be removed from today’s Dragon to make room for consumerables. NASA officials also stated publicly during this update that it is now definitely considering using Starliner as a cargo vehicle on its next flight, a plan that previously had only been hinted at.

The leaders in the 2025 launch race:

45 SpaceX (with another launch scheduled for later today)
20 China
5 Rocket Lab
5 Russia

SpaceX now leads the rest of the world in successful launches, 45 to 35.

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Soyuz safely returns three astronauts from ISS

9:42 am

A Russian Soyuz capsule successfully landed in Kazakhstan this morning, bring two Russians and one American back to Earth after a seven month mission to ISS.

The American on board, Don Petit, also celebrated his 70th birthday today, completing his fourth mission in space. According to the article at the link, he did not do well upon landing, requiring significant aid to exit the capsule. The picture released by NASA of him being carried to the medical tent shows him smiling with a thumbs up, but he is clearly unable to walk at this point on his own. That fact by itself is not significant, because many astronauts after missions lasting longer than six months need aid upon return. It does indicate however that this flight is almost certainly Petit’s last one. As that NASA release it notes he “is doing well and in the range of what is expected for him following return to Earth.”

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NASA-Roscosmos barter deal to fly each other astronauts to ISS extended

8:55 am

In announcing its future crew assignments in early April NASA also confirmed that its barter deal with Russia to fly each other astronauts to ISS has been extended to 2027.

NASA announced April 3 that astronaut Chris Williams had been assigned to the Soyuz MS-28 spacecraft scheduled to launch to the ISS in November, joining Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev. The announcement came ahead of the April 8 launch of fellow astronaut Jonny Kim to the ISS on Soyuz MS-27.

The announcement of the Williams flight assignment was the first public indication by NASA that it has extended an agreement with Roscosmos for “integrated crews” on Soyuz and commercial crew flights to the ISS. Under the no-exchange-of-funds barter agreement, NASA astronauts fly on Soyuz spacecraft and Roscosmos cosmonauts fly on commercial crew vehicles to ensure that there is at least one American and one Russian on the station should either Soyuz or commercial crew vehicles be grounded for an extended period.

Russian sources in January 2025 had indicated the agreement had been extended, but this most recent non-announcement is the first confirmation by NASA.

One interesting change in the schedule revealed by this crew announcement is that Russia will be launching less frequently while extending its Soyuz missions. Previously Russia’s missions were six months long, the same length as NASA’s standard ISS mission. Now Russia will only launch every eight months. No explanation was given for this change, which will likely complicate the station’s already complex docking schedule. I suspect two reasons: First the Russian government probably needs to reduce costs, and flying less often serves that purpose. Second, Roscosmos officials probably want to also fly longer missions for research.

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Russia launches three astronauts to ISS

10:57 pm

Russia early on April 8, 2025 successfully launched two Russians and one American to ISS on a six month mission, its Soyuz-2 rocket lifting off from its Baikonur spaceport in Kazakhstan.

They will dock with ISS after only two orbits, three hours after launch.

The leaders in the 2025 launch race:

40 SpaceX
18 China
5 Rocket Lab
5 Russia

SpaceX still leads the rest of the world in successful launches, 40 to 32.

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Starliner’s troubles were much worse than NASA made clear

11:51 am

Starliner docked to ISS
Starliner docked to ISS.

According to a long interview given to Eric Berger of Ars Technica, the astronauts flying Boeing’s Starliner capsule on its first manned mission in June 2024 were much more vulnerable than NASA made it appear at the time.

First, the thruster problem when they tried to dock to ISS was more serious than revealed. At several points Butch Wilmore, who was piloting the spacecraft, was unsure if he had enough thrusters to safely dock the capsule to ISS. Worse, if he couldn’t dock he also did not know if had enough thrusters to de-orbit Starliner properly.

In other words, he and his fellow astronaut Sunni Williams might only have a few hours to live.

The situation was saved by mission control engineers, who figured out a way to reset the thrusters and get enough back on line so that the spacecraft could dock autonomously.

Second, once docked it was very clear to the astronauts and NASA management that Starliner was a very unreliable lifeboat.
» Read more

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NASA/Boeing: More Starliner ground engine tests throughout 2025; Next flight likely in 2026

9:51 am

Starliner docked to ISS
Starliner docked to ISS.

According to a press release from NASA late yesterday, both the agency and Boeing will spend most of the rest of this year doing additional Starliner static fire engine tests of thruster redesigns before considering another flight of the capsule to ISS.

NASA and Boeing are working to finalize the scope and timelines for various propulsion system test campaigns and analysis that is targeted throughout the spring and summer. Testing at White Sands Test Facility in New Mexico will include integrated firing of key Starliner thrusters within a single service module doghouse to validate detailed thermal models and inform potential propulsion and spacecraft thermal protection system upgrades, as well as operational solutions for future flights. These solutions include adding thermal barriers within the doghouse to better regulate temperatures and changing the thruster pulse profiles in flight to prevent overheating. Meanwhile, teams are continuing testing of new helium system seal options to mitigate the risk of future leaks.

“Once we get through these planned test campaigns, we will have a better idea of when we can go fly the next Boeing flight,” said Steve Stich, manager, NASA’s Commercial Crew Program at the agency’s Kennedy Space Center in Florida. “We’ll continue to work through certification toward the end of this year and then go figure out where Starliner fits best in the schedule for the International Space Station and its crew and cargo missions. It is likely to be in the timeframe of late this calendar year or early next year for the next Starliner flight.”

The release indicated that the goal is to get the capsule certified prior to the next flight so that it can carry a crew on a fully operational mission. The release however left open the option that this next ISS flight might instead be an unmanned cargo mission. The announcement said nothing about who will pay for this flight. Under Boeing’s fixed-priced contract, it should foot the bill, but no one should be surprised if NASA works a deal to funnel money Boeing’s way.

Meanwhile, the agency has changed some of the crew assignments for that first and long-delayed operational Starliner flight, switching astronaut Mike Fincke from that mission to the next Dragon mission to launch later this year. (I suspect Fincke wanted to fly again, and was tired of sitting on his hands waiting for Boeing to get Starliner working.)

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NASA: Cygnus capsule damaged in transit to launchpad is too damaged to launch

9:25 am

According to this Ars Technica article today, the Cygnus cargo capsule that was reported to be damaged several weeks ago while being transported in a shipping container to its launchpad has now been found too damaged for launch, according to NASA.

On Wednesday, after a query from Ars Technica, the space agency acknowledged that the Cygnus spacecraft designated for NG-22 is too damaged to fly, at least in the nearterm. “Following initial evaluation, there also is damage to the cargo module,” the agency said in a statement. “The International Space Station Program will continue working with Northrop Grumman to assess whether the Cygnus cargo module is able to safely fly to the space station on a future flight.” That future flight, NG-23, will launch no earlier than this fall.

As a result, NASA is modifying the cargo on its next cargo flight to the space station, the 32nd SpaceX Cargo Dragon mission, due to launch in April. The agency says it will “add more consumable supplies and food to help ensure sufficient reserves of supplies aboard the station” to the Dragon vehicle.

It will be at least half a year before the next Cygnus will be ready for launch.

As the article notes (and immediately occurred to me also), this incident creates an opportunity to help Boeing and Starliner. Last year there were rumors that NASA might pay Boeing to fly Starliner as an unmanned cargo flight to ISS. This would allow the company to test its fixes to the capsule without having to pay for another test flight. These rumors however have faded since Trump took power, suggesting the new administration did not want to pay that extra money.

The loss however of this Cygnus cargo mission not only frees up NASA cash that could be transferred to a Starliner cargo mission, it frees up a slot in the cargo schedule. It actually makes a lot of sense to give Boeing the job.

Unfortunately, unless someone higher up in the Trump administration (possibly Trump himself) makes the decision, we should not expect any action on this idea until NASA’s new administrator is confirmed by the Senate and takes office. And that event remains in limbo at this point.

In the meantime, NASA has no redundancy for getting cargo to ISS, and must rely entirely on SpaceX and its Dragon cargo capsules. A third option, Sierra Nevada’s Tenacity Dream Chaser reusable cargo mini-shuttle, is still not ready to launch. It was supposed to do its first test flight to ISS a year ago, but could not because ground testing had to be done first, and for reasons that are very unclear, it appears that testing has not yet been completed.

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Freedom capsule splashes down successfully

3:26 pm

SpaceX’s Freedom capsule has successfully splashed down off the coast of Florida, and has now been fished out of the water.

UPDATE: All four astronauts have now exited the capsule.

In watching the live stream, it is important to once again note that no one involved in this recovery operation is a government employee. The entire operation is being run by SpaceX, a private American company doing this work for profit.

It will take a bit more time before the astronauts come out of the capsule, as they must do some leak checks to make sure everything is safe.

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SpaceX’s manned Freedom capsule has undocked with ISS with its crew of four

12:39 am

SpaceX’s manned Freedom capsule tonight undocked with ISS, carrying with it the two astronauts that launched with it in September as well as the two astronauts that launched on Boeing’s Starliner capsule in June.

At 1:05 a.m. EDT Tuesday, NASA astronauts Nick Hague, Suni Williams, and Butch Wilmore, along with Roscosmos cosmonaut Aleksandr Gorbunov undocked from the space-facing port of International Space Station’s Harmony module aboard the SpaceX Dragon spacecraft.

Splashdown is scheduled for 5:57 pm (Eastern) March 18, 2025 off the coast of Florida. I have embedded the NASA live stream below.

Normally the transfer of control of the station from the old crew to the new one takes about a week. In this case NASA cut that transfer time to only three days because of the political desire to get the Starliner astronauts home more quickly. The irony is that NASA decided to leave them up there for almost seven months more than planned in order to disturb its normal ISS launch and crew schedule as little as possible. This effort now to shorten their spaceflight by a few measly days seems quite trivial in comparison.
» Read more

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SpaceX launches new crew to ISS

10:16 pm

Falcon 9 first stage barreling home to Florida
Falcon 9 first stage barreling home to Florida tonight.

After a scrub two days ago due to a ground equipment issue, SpaceX tonight successfully launched a new crew of four to ISS, its Falcon 9 rocket lifting off from Kennedy in Florida.

The Dragon capsule is Endurance, on its fourth flight. The first stage completed its third flight, landing back in Florida.

This launch will allow the two-person crews launched by Boeing’s Starliner capsule in June and SpaceX’s Freedom capsule in September to come back home on Freedom.

When it was decided not to allow the Starliner astronauts to come home on Starliner because of thruster issues on the capsule, NASA decided to keep its ISS launch schedule as normal as possible, thus forcing that crew to complete a mission of about eight months, with a planned return in February 2025. Initially their Starliner mission was expected to last anywhere from two weeks to two months-plus, depending on how well Starliner functioned while docked to ISS.
» Read more

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Russia successfully launches new Progress freighter to ISS

3:07 pm

Russia today successfully placed a new Progress freighter into orbit, its Soyuz-2 rocket lifting off from Kazakhstan.

The freighter will dock with ISS on March 2, 2025, docking with the aft port of the Zvezda module, the core module of the Russian half of the station. I guarantee that during that docking the hatch will be closed between the American and Russian segments, as that is now NASA’s policy because of its concern about the stress fractures in Zvezda.

The leaders in the 2025 launch race:

25 SpaceX
9 China
2 Rocket Lab
2 Russia

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Musk: ISS should be de-orbited quickly! And he may be right.

12:23 pm

Figure 3 from September Inspector General report
Figure 3 from September Inspector General report, showing ISS and outlining the airlieak annotated to show Zvezda and Poisk locations.

Food fight! Yesterday Elon Musk did a Donald Trump, issuing a bunch of tweets that are likely causing some heads to explode inside NASA, Congress, and Europe.

First — and far less significant — Musk got into a war of insults with European Space Agency astronaut Andreas Mogensen over his comments in recent days accusing the Biden administration of delaying the return of the two Starliner astronauts “for political reasons.” Mogensen accused Musk lying about this, and Musk responded by calling Mogenson “fully retarded” and an “idiot,” adding that “SpaceX could have brought them back several months ago. I OFFERED THIS DIRECTLY to the Biden administration and they refused. Return WAS pushed back for political reasons.”

Since Musk was there and Mogensen was not, it seems Musk won that battle. NASA meanwhile issued a mild statement saying everything it has done has been to maximize safety, a statement that matches the facts quite accurately.

Then Musk — on a far more important topic — stirred the pot more by tweeting his belief that ISS should be retired now.

It is time to begin preparations for deorbiting the Space_Station. It has served its purpose. There is very little incremental utility. Let’s go to Mars.

In a second tweet he recommended the de-orbit should occur “two years from now.”

Left unstated by Musk was what might be his most important reason for retiring ISS so quickly: the fragile condition of the Russian-built Zvezda module. » Read more

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French startup The Exploration Company wins major contract from Germany

9:39 am

Germany’s space agency, DLR, announced today that it has signed a major contract with the French startup The Exploration Company to use its Nyx reusable capsule, still under development, for in-orbit weightlessness research.

On 20 February, during its DLR TecDays in Bonn, the German aerospace agency announced that it had signed a contract with The Exploration Company and would serve as an anchor customer for its microgravity research service. The contract secures space for 160 kilograms of scientific payloads aboard the inaugural flight of the Nyx Earth capsule in 2028. “We are supporting a startup that provides services that will be particularly valuable in a post-ISS era,” explained Dr. Walther Pelzer, Head of the German Space Agency at DLR.

Nyx’s main customer base was originally to serve as a cargo freighter for all of planned commercial space stations, having already been chosen by the European Space Agency as one of two European companies (the other being Thales-Alenia) to fly cargo demonstration missions to ISS in 2028.

This new contract illustrates the wider possibilities for profit for these capsules that has appeared in the past two years. If you can launch a returnable capsule to bring cargo, why not launch it to do in-orbit research and manufacturing? Varda in the U.S. has already demonstrated this possibility. Others apparently are now recognizing it as well.

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Musk: Biden delayed the return of Starliner’s astronauts “for political reasons”

10:06 am

During a television interview with President Trump, Elon Musk suggested that the reason the two Starliner astronauts have been forced to remain on ISS for months was because of a political decision by the Biden administration last year.

The billionaire SpaceX CEO said his company was “accelerating the return of the astronauts” as per Trump’s instructions. Musk then appeared to take a shot at the Biden administration, saying the move was “postponed kind of to a ridiculous degree,” before the president chimed in saying “they got left in space.”

When Hannity pointed out the astronauts have been on the ISS for almost 300 days instead of the planned 8 days, Trump simply said “Biden,” before Musk claimed they were “left up there for political reasons, which is not good.”

While the decision to return Starliner unmanned certainly had a political component (a desire to avoid a disaster in the final year of Biden’s term), Musk’s claim is greatly exaggerated. Worse, Musk is papering over his own company’s contribution to the delays. Had SpaceX and NASA chosen in December to use an already existing Dragon capsule instead of a brand new capsule to launch the next crew to ISS, the astronauts would be home already. Instead, they decided to get that new capsule ready, requiring an almost two month delay in their return.

When it became obvious last month that even this extra time was insufficient to get the new capsule ready, only then did SpaceX and NASA choose to switch capsules. That switch allowed them to move up the return date by about a week.

In reporting Musk’s words here, our ignorant press has generally left these details out, allowing both Musk and Trump to make it appear as they are saviors for these poor astronauts. This is simply not true. SpaceX is certainly making it possible to bring them home (something Boeing was unable to do), but it also contributed to the delay in doing so.

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