Tag: engineering

Major explosion during preparations for static fire test of Starship prototype

11:14 pm

The moment the explosion begins on this Starship prototype<

As engineers tonight were preparing for a standard static fire engine test at Boca Chica of the next Starship prototype, expected to fly on the tenth Starship/Superheavy test flight, the spacecraft suddenly exploded.

I have embedded video of the explosion below. The event occurred prior to the actual static fire test, while Starship’s tanks were being filled. The image to the right is a screen capture just as the explosion begins. The white cloud is the initial release from the explosion (not standard venting), with the red dot indicating the location where the event began. It appears very much to have started inside this Starship spacecraft, which SpaceX was preparing for the next test flight.

Fortunately, no injuries have been reported.

Obviously, this is going to delay somewhat that tenth test flight. SpaceX has more Starship prototypes ready to go, but the company must first figure out what went wrong in this case. It also appears there might be some damage to that test stand, which will also have to be rebuilt so that future static fire tests of upcoming Starships can take place.
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France’s space agency agrees to let Spanish rocket startup PLD establish its own launch site at French Guiana

12:38 pm

Though France’s space agency CNES had initially attempted to place many rules and restrictions on the commercial operations of new independent private rocket companies at its spaceport in French Guiana, it has now backed off those demands in agreeing to let the Spanish rocket startup PLD establish its own launch site there at the decommissioned launchpad used by France’s Diament rocket in the 1970s.

This new contract greenlights the implementation of the infrastructure project designed by PLD Space with technical support from CNES and grants legal use of land in the ELM-Diamant area, where the MIURA 5 Preparation Zone and Launch Zone will be located. Construction will begin with the start of the dry season in French Guiana, expected in the summer months of 2025.

In September 2024 CNES said it wished to standardize the launch site for the seven different European rocket startups (Avio, HyImpulse, Isar Aerospace, MaiaSpace, PLD Space, Rocket Factory Augsburg, and Latitude) it had approved to use it. At the time I sensed there was opposition from these companies to this policy, since each rocket was different and would not function with this standardized design.

At a minimum that policy apparently delayed PLD’s plans, as it originally hoped to start its launchpad construction in October 2024 and launch in 2025. That schedule went by the wayside.

It now appears PLD will proceed with development as it wishes, for its rocket, and the others will have to figure out how fit their rockets to that design. Or maybe CNES is going to open up further sites at French Guiana to avoid this conflict.

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Another company enters the military’s hypersonic test market

9:57 am

UP Aerospace today announced the successful launch of its suborbital small Spyder rocket, designed expressly for hypersonic flight testing.

The maiden flight took place at 7:00 AM MST at Launch Complex 36 [at White Sands Missile Range in New Mexico], marking a new era in hypersonic mission capabilities. The mission reached the threshold of hypersonic speeds similar to the UP Aerospace SpaceLoft rocket missions that have been operational for 20 years.

In the U.S. the military now can do hypersonic flight tests using this small rocket, Stratolaunch’s giant Roc plane and Talon-A flight vehicle, Rocket Lab’s Haste reconfiguration of its Electron rocket, and Varda’s orbital capsules on their return from space. In addition there is at least one other startup, Radian, that hopes to build a space plane for hypersonic testing as well.

I also expect this testing to result in some new technologies for both commercial aircraft as well as rockets.

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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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SpaceX launches 28 Starlink satellites

8:47 am

The beat goes on! SpaceX successfully launched another 28 Starlink satellites early this morning, its Falcon 9 rocket lifting off from Cape Canaveral in Florida.

The first stage completed its fifth flight, landing on a drone ship in the Atlantic.

The leaders in the 2025 launch race:

76 SpaceX
34 China
8 Rocket Lab
6 Russia

SpaceX now leads the rest of the world in successful launches, 76 to 55.

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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.
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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.
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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.

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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.
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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.

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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.

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Brian Cox – The world’s biggest vacuum chamber

6:01 pm

An evening pause: Watch another demonstration of Galileo’s Leaning Tower of Pisa experiment where he proved gravity worked the same on all objects regardless of weight.

May everyone have a great weekend.

Hat tip Doug Johnson.

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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.

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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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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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