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June 17, 2025 Quick space links

2:51 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

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Mars will be mystery until we can walk its surface

1:43 pm

A Martian mystery
Click for original image.

Today’s cool image illustrates starkly the limitations of orbital imagery. The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on March 30, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows flow features inside a depression that strongly resemble glacial features, with the downhill grade roughly heading south.

Such features are seen in many places on Mars, almost always in the 30 to 60 degree mid-latitude bands in both the northern and southern hemispheres (see here, here, and here for just three examples. For many more simply search this website using “glacier” or “glacial feature” as search terms).

The problem is that this location is not within that 30 to 60 degree latitude band. In fact, at this location no near surface ice should exist at all.
» Read more

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Genesis cover

On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.

 

The print edition can be purchased at Amazon, any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.


The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
 

"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News

Honda’s grasshopper rocket successfully completes vertical take-off and landing

10:48 am

Honda today successfully completed the first test of its own grasshopper prototype rocket, with the rocket reaching a height of 890 feet before landing vertically 56 seconds after launch.

I have embedded the video of the flight below.

Honda had announced this project back in 2021, but since then had published no updates of note. This flight indicates that project is real and is on going.

In 2021 the company said it was targeting the first orbital flights by 2030. Today’s update says it will be doing suborbital flights in 2029, which suggests the orbital flights will not occur in 2030.
» Read more

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Under Trump FCC shifts from regulating satellite construction and de-orbit to streamlining red tape

9:15 am

FCC seal

According to a Space News article yesterday, the FCC’s regulatory focus since January and the advent of the Trump administration has shifted significantly from its focus during the Biden administration.

The article describes in detail the present focus to streamline regulations and speed license approvals.

One early result of this push is a reduction in the FCC’s licensing backlog. Schwarz said the space bureau has reduced pending applications by 35 percent since January, including those for new space stations and ground infrastructure.

Modernizing regulations for non-geostationary satellite systems is another priority. The FCC is considering revising so-called “power limit” rules aimed at preventing interference between low-orbit constellations and traditional geostationary satellites and earth stations. Schwarz said these reforms could help pave the way for higher-throughput services that rival terrestrial broadband.

This focus appears correctly centered on the FCC’s actual legal statutory authority to regulate the limited bandwidth of the electromagnetic spectrum to avoid conflicts in its use.

Under Biden, the FCC instead focused on expanding its power beyond that statutory authority, claiming it had the right to determine how satellites were built, when they would be de-orbited, and in what manner. None of those activities have anything to do with bandwidth and the FCC’s legal responsibilities.

There was some legislative push back from Congress during the Biden administration, but it was slow and relatively weak. Now that push back has become unnecessary, because the FCC under Trump is back to doing its actual job instead of trying to build empires of regulation.

The agency also appears, for the moment, to have ended its partisan abuse of red tape for political reasons. Under Biden it used its regulatory power against SpaceX in retaliation to Elon Musk’s decision to publicly support Biden’s political opponents. It appears the present effort to speed license approvals for everyone has ended this practice.

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Conscious Choice cover

Now available in hardback and paperback as well as ebook!

 

From the press release: In this ground-breaking new history of early America, historian Robert Zimmerman not only exposes the lie behind The New York Times 1619 Project that falsely claims slavery is central to the history of the United States, he also provides profound lessons about the nature of human societies, lessons important for Americans today as well as for all future settlers on Mars and elsewhere in space.

 
Conscious Choice: The origins of slavery in America and why it matters today and for our future in outer space, is a riveting page-turning story that documents how slavery slowly became pervasive in the southern British colonies of North America, colonies founded by a people and culture that not only did not allow slavery but in every way were hostile to the practice.  
Conscious Choice does more however. In telling the tragic history of the Virginia colony and the rise of slavery there, Zimmerman lays out the proper path for creating healthy societies in places like the Moon and Mars.

 

“Zimmerman’s ground-breaking history provides every future generation the basic framework for establishing new societies on other worlds. We would be wise to heed what he says.” —Robert Zubrin, founder of the Mars Society.

 

All editions are available at Amazon, Barnes & Noble, and all book vendors, with the ebook priced at $5.99 before discount. All editions can also be purchased direct from the ebook publisher, ebookit, in which case you don't support the big tech companies and the author gets a bigger cut much sooner.

 

Autographed printed copies are also available at discount directly from the author (hardback $29.95; paperback $14.95; Shipping cost for either: $6.00). Just send an email to zimmerman @ nasw dot org.

Rocket Lab gets a quick launch contract from unnamed customer

8:50 am

Rocket Lab today announced it has been awarded a launch contract from an unnamed “confidential commercial customer” calling for two launches before the end of this year, with the first to occur only four days from today.

Launching from Rocket Lab Launch Complex 1 in New Zealand, the first dedicated mission on Electron – named “Symphony In The Stars” – will take place no earlier than June 20, 2025 to deploy a single spacecraft to a 650km circular Earth orbit. A second dedicated launch on Electron to meet those same mission requirements is scheduled for launch before the end of 2025.

That the customer name is classified suggests these are both military launches, and are designed to demonstrate Rocket Lab’s ability to launch something fast under short notice. The new contract also increases the chances that Rocket Lab will manage two dozen launches in 2025, a pace of twice a month.

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SpaceX launches 26 more Starlink satellites

8:44 am

SpaceX last night successfully placed 26 more Starlink satellites in orbit, its Falcon 9 rocket lifting off from Vandenberg in California.

The first stage completed its third flight, landing on a drone ship in the Pacific.

A comparison between this launch of SpaceX’s Starlink with Amazon’s scrubbed ULA launch of 27 Kuiper satellites yesterday is worth noting. This launch of 26 Starlink satellites was utterly routine, and just one of four in just the past week, all of which put 98 satellites into orbit. Thousands of such satellites have been launched since the first launch in 2018.

Amazon’s attempt to launch 27 Kuiper satellites was scrubbed, and would have only been the second launch total, separated by about six weeks. The constellation only has 27 satellites in orbit, and its launches are anything but routine, despite signing launch contracts with four different rocket companies. And yet, Amazon proposed Kuiper at almost the same time SpaceX proposed Starlink, in the mid-2010s.

I will let my readers draw their own conclusions from this comparison.

The leaders in the 2025 launch race:

75 SpaceX
34 China
8 Rocket Lab
6 Russia

SpaceX now leads the rest of the world in successful launches, 75 to 55.

2 comments

Leaving Earth cover

Leaving Earth: Space Stations, Rival Superpowers, and the Quest for Interplanetary Travel, can be purchased as an ebook everywhere for only $3.99 (before discount) at amazon, Barnes & Noble, all ebook vendors, or direct from my ebook publisher, ebookit.

 

If you buy it from ebookit you don't support the big oppressive tech companies and I get a bigger cut much sooner.

 

Winner of the 2003 Eugene M. Emme Award of the American Astronautical Society.

 
"Leaving Earth is one of the best and certainly the most comprehensive summary of our drive into space that I have ever read. It will be invaluable to future scholars because it will tell them how the next chapter of human history opened." -- Arthur C. Clarke

June 16, 2025 Quick space links

3:36 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

10 comments

Spinlaunch signs deal to build its spin launch facility on island in Alaska

12:30 pm

Spinlaunch prototype launcher

Spinlaunch has now confirmed that it has signed a deal to build its spin launch facility on Adak island in the far western extent of the Alaskan island chain.

The facility will be a scaled up version of its spin launch test facility in New Mexico, shown to the right, that was used for tests back in 2022, hurling payloads 35,000 feet into the sky up by spinning them up.

Since then the company changed its leadership and shifted focus to building a satellite constellation that will at least initially will be launched by conventional rockets. This new agreement, actually signed in October 2024 but kept secret until now, suggests that it has not yet abandoned its spin launch technology.
» Read more

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ULA scrubs 2nd Kuiper constellation launch due to technical issue

10:24 am

ULA today scrubbed its second Atlas-5 launch to place 27 more of Amazon’s Kuiper constellation satellites into orbit due to “an engineering observation of an elevated purge temperature within the booster engine.”

At the moment no new launch date has been scheduled.

So far Amazon has only placed 27 operational Kuiper satellites into orbit, on a single Atlas-5 launch in April. According to its FCC license, it must have 1,600 satellites in orbit by July 2026. Though it has contracts to launch these satellites 46 times on ULA rockets (8 on Atlas-5 and 36 on Vulcan), 27 times on Blue Origin’s New Glenn, 18 times on ArianeGroup’s Ariane-6, and 3 times on SpaceX’s Falcon-9, except for SpaceX all these companies have had problems getting off the ground.

Whether Amazon can meet the FAA licence requirement by next year is becoming increasingly questionable.

6 comments

Cruz’s pork/budget bill also adds new taxes to rocket launches

10:08 am

Ted Cruz, a typical
Ted Cruz, a typical “tax-and-spend” Republican

It appears the Senate appropriations bill that was put forth last week by senator Ted Cruz (R-Texas), head of the Senate’s commerce committee, was not simply filled with pork, it also establishes a new tax structure for rocket launches, with the money supposedly allocated to pay for the increased red tape required by the FAA.

Cruz’s section of the Senate reconciliation bill calls for the FAA to charge commercial space companies per pound of payload mass, beginning with 25 cents per pound in 2026 and increasing to $1.50 per pound in 2033. Subsequent fee rates would change based on inflation. The overall fee per launch or entry would be capped at $30,000 in 2026, increasing to $200,000 in 2033, and then adjusted to keep pace with inflation.

You can read the bill here [pdf].

In a statement by Cruz during a senate hearing last week, he justified these new taxes as follows:
» Read more

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China launches science satellite to study Earth’s electromagnetic fields

9:34 am

China today successfully launched a science satellite built in partnership with Italy and designed to study the interaction of the Earth’s atmosphere with its electromagnetic fields, its Long March 2D rocket lifting off from its Jiuquan spaceport in northwest China.

No word on where the rocket’s lower stages crashed inside China. As for the satellite:

With a designed lifespan of six years, the satellite is equipped with nine payloads, including an electric field detector co-developed by China and Italy, as well as a high-energy particle detector developed by Italy. It will carry out quasi-real-time monitoring of global electromagnetic fields, electromagnetic waves, the ionosphere and the neutral atmosphere, detecting electromagnetic anomalies caused by geological and human activities, as well as monitoring thunderstorm and lightning activity, according to CNSA.

The leaders in the 2025 launch race:

74 SpaceX
34 China
8 Rocket Lab
6 Russia

SpaceX still leads the rest of the world in successful launches, 74 to 55.

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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.

8 comments

June 13, 2025 Quick space links

3:24 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

8 comments

The mad mountains of Mars

10:34 am

The mad mountains of Mars
Click for original image.

Overview map
Click for interactive map

Cool image time! The picture above, cropped to post here, was taken on June 10, 2025 by the high resolution camera on the Mars rover Curiosity, and shows some of the stranger terrain found higher up the flanks of Mount Sharp in Gale Crater.

The blue dot on the overview map to the right marks Curiosity’s present position, where it is doing another drilling campaign into the first boxwork geology it has encountered. The white line marks its past travels, while the green dotted line its planned route.

The yellow lines indicate the area seen in the picture above. The wild mountain peaks on the horizon are part of the sulfate-bearing unit that appears very bright in the overview map. The material that makes up this terrain appears to be very easily eroded, based on its features as seen from orbit, as well as Curiosity’s distant view. Whether that erosion was wind, water, or ice, remains undetermined, and is the main question Curiosity will attempt to answer once it gets there, likely in a year or so.

Regardless, the landscape appears almost like it soft sand being washed away.

Where the rover will go next the science team has not yet decided. It will definitely continue uphill, but they do not yet know the route they will take through that sulfate-bearing unit.

3 comments

SpaceX launches 23 more Starlink satellites

9:16 am

SpaceX this morning successfully placed 23 Starlink satellites into orbit (including 13 with phone-to-satellite capabilities), its Falcon 9 rocket lifting off from Cape Canaveral in Florida.

The first stage completed its 21st flight, landing on a drone ship in the Atlanta.

The leaders in the 2025 launch race:

74 SpaceX
33 China
8 Rocket Lab
6 Russia

SpaceX now leads the rest of the world in successful launches, 74 to 54.

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French startup The Exploration Company launches its own recovery ship

9:10 am

The French startup, The Exploration Company, has now launched its own ship designed to recover its next prototype test cargo capsule, set to launch on a Falcon 9 on June 21, 2025.

In an 11 June update, The Exploration Company announced that the recovery vessel tasked with retrieving the Mission Possible capsule after splashdown had departed the previous day from a harbour in Alaska. The vessel, named Makushin Bay, is a 40-metre salvage and rescue ship owned and operated by US-based maritime logistics company Resolve Marine. Two members of The Exploration Company’s team will accompany the vessel on its mission. Over the next week, it will make its way to the expected splashdown zone in the central Pacific Ocean. According to The Exploration Company, current weather conditions appear favourable for both splashdown and recovery operations.

The company aims to provide cargo to the commercial space stations under development using its proposed Nyx capsule. As part of its own development program it has flown a smaller prototype already on the first launch of Europe’s Ariane-6 rocket, but was unable to test its re-entry capability because of a failure in that rocket’s upper stage. This second larger prototype will try again, and this time has a better shot at completing its test because it if flying on SpaceX’s very reliable Falcon 9. Thus, the launch of this recovery vessel.

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Kazakhstan moves west

9:01 am

Two stories today suggest that Kazakhstan is shifting its politics away from Russia and towards the west, albeit carefully and with an eye to avoid poking the bear that lives so close by.

First, the government’s tourism agency announced plans to develop tourism at its Baikonur spaceport.

Participants discussed infrastructure upgrades, the creation of new travel routes, brand strengthening, investment attraction and partnerships to support long-term development.

According to Kazakh Tourism Сhairman Kairat Sadvakasov, the concept focuses on building a sustainable tourism ecosystem during the periods between rocket launches. The goal is to integrate Baikonur into Kazakhstan’s cultural, educational and scientific agenda.

Both the Soviet and Russian governments have always treated Baikonur as a classified military installation, and forbid such visitation, including vetoing public viewing areas areas. Kazakhstan has likely seen the cash earned by India and U.S. by allowing such spaceport tourism, and wants some for itself. Evidently it now thinks the Russians no longer have the clout to stop it from doing so.

Next, Kazakhstan’s government announced it has signed a deal with SpaceX to introduce Starlink into the country.

The agreement ensures that Starlink will comply with Kazakhstan’s legal and regulatory requirements, including those related to information security and communications. Until now, Starlink operated in the country only on a pilot basis, providing internet access exclusively to schools.

The upcoming launch will allow citizens to legally purchase, register, and use Starlink terminals. The service aims to improve high-speed internet access in remote and hard-to-reach regions, supporting rural schools, healthcare centers, mobile units, and infrastructure sites – particularly in areas where laying fiber-optic networks is not feasible.

This deal also suggests a change in Kazakhstan’s relationship with Russia. Starlink is blocked from Russia due to its invasion on the Ukraine. Yet the service is now available to both Kazakhstan and the Ukraine, formerly part of the Soviet Union and directly adjacent to Russia. That Kazakhstan is publicly permitting Starlink in is a clear statement that it wants the same technology as the Ukraine to better protect it from a Russian invasion.

It also suggests a decline in Russia’s influence inside Kazakhstan. Previously if the Russians said jump, the Kazakhstan government would ask, “How high?” Now it appears it is willing to act more independently, and in ways that are not necessarily in Russia’s interests.

One wonders if this shift could go as far as Kazakhstan trying to sell Baikonur as a launch site for other commercial entities, such as from India, China, and Europe. I doubt many would buy the service (Baikonur is not well located compared to other spaceports), but the very offer would signal a major political shift in this part of the world.

5 comments

June 12, 2025 Quick space links

2:52 pm

Courtesy of BtB’s stringer Jay. This post is also an open thread. I welcome my readers to post any comments or additional links relating to any space issues, even if unrelated to the links below.

19 comments

Why Kennedy’s decision to fire everyone at the CDC advisory panel was only a start

11:57 am

Sudden collapse
One of many sudden public collapses from jab-induced heart failure.
Click for full video.

On June 9, 2025 the head of the Health and Human Services at the federal government Robert Kennedy fired all seventeen members of the Centers for Disease Control and Prevention’s (CDC) Advisory Committee for Immunization Practices (ACIP).

According to Kennedy, each member was appointed by the Biden administration as part of a “concerted effort to lock in public health ideology” and to limit the Trump administration from taking “the proper actions to restore public trust in vaccines.” ACIP members usually serve four-year terms. Because 13 appointees took their seats in 2024, without the complete ouster, the committee would not have had a Kennedy-selected majority until 2028.

“A clean sweep is necessary to reestablish public confidence in vaccine science,” Kennedy said in the HHS release. He will be responsible for appointing the new committee members, which are scheduled to meet from June 25 to June 27 to discuss a slate of vaccines, including those for anthrax, chikungunya, COVID-19, cytomegalovirus, influenza and HPV.

All the usual suspects on the left, including members of Congress and in the propaganda press, immediately went into a hissy-fit, claiming Kennedy’s action was “politicizing the ACIP,” even though it is blatantly obvious that Biden had made his 2024 appointments, just before the election, for his own political reasons.

Politics aside, however, the real reason to dump these Biden-era appointees is that they were also part of the “intellectual” cabal that foisted jab mandates, mask mandates, six-foot social distancing, and lockdowns on everyone. None of these policies were based on any proven science research, and in fact they violated decades of infectious disease policy that recommended doing the exact opposite, across the board.

Worse, there is now clear evidence [pdf] that these same people demanded the imposition of jab mandates, even though they were well aware at the time that the jab caused serious side effects that killed. As noted in this June 11, 2025 report:
» Read more

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Voyager Technologies raises nearly $400 million in first public stock offering

9:43 am

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

The space station startup Voyager Technologies has now raised $383 million during its first public stock offering this week, with the possibility of more investment capital to come.

The six-year-old provider of mission-critical space and defense technology solutions sold 12.35 million shares at $31 each, pricing above the $26–$29 range it marketed last week. The Denver-based company had initially planned to offer 11 million shares.

Underwriters also have a 30-day option to purchase up to 1.85 million additional shares of the company’s Class A common stock, up from 1.65 million, trading under the ticker symbol VOYG.

Of the four private commercial space stations under development, Voyager is the only one to have so far built nothing. Its station, dubbed Starlab, is conceived as a single large module launched on SpaceX’s Starship/Superheavy rocket. Though the company has obtained a $217.5 million development grant from NASA, and is partnering with Airbus, Northrop Grumman, and the European Space Agency, it has focused so far all of its work on design.

We must assume the company intends to use this additional public capital to begin some construction. It likely needs to if it is to have any chance of winning NASA’s major contract for building the station itself, since all of its other competitors are doing so. My present rankings for these four projects:

  • 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 to launch momentarily, 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. The company however has now raised $383 million in a public stock offering, which in addition to the $217.5 million provided by NASA gives it the capital to begin some construction.
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Europe’s Solar Orbiter takes first images of the Sun’s south pole

9:27 am

The south pole of the Sun
Click for original image.

Because its orbit has now dropped 17 degrees below the ecliptic plane of the solar system, the European Space Agency’s (ESA) Solar Orbiter probe has been able to snap the first images of the Sun’s south pole, as shown by the two pictures to the right.

The [two images show] the Sun’s south pole as recorded on 16–17 March 2025, when Solar Orbiter was viewing the Sun from an angle of 15° below the solar equator. This was the mission’s first high-angle observation campaign, a few days before reaching its current maximum viewing angle of 17°.

The instruments each observe the Sun in a different way. PHI images the Sun in visible light (left) and maps the Sun’s surface magnetic field (right).

The magnetic field data on the right has revealed that at present the field at the pole is “a mess,” because the Sun is presently at solar maximum.

While a normal magnet has a clear north and south pole, the PHI instrument’s magnetic field measurements show that both north and south polarity magnetic fields are present at the Sun’s south pole. This happens only for a short time during each solar cycle, at solar maximum, when the Sun’s magnetic field flips and is at its most active. After the field flip, a single polarity should slowly build up and take over at the Sun’s poles. In 5–6 years from now, the Sun will reach its next solar minimum, during which its magnetic field is at its most orderly and the Sun displays its lowest levels of activity.

Solar Orbiter is now well positioned to observe the expected changes in the Sun’s magnetic field as sunspot activity ramps down to solar minimum.

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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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