Category: Behind The Black

Saturn as seen by Cassini in 2004, four months before orbital insertion

12:18 pm

Saturn as first seen up close by Cassini
Click for original.

Cool image time! As most of the new cool images coming down from space seem mostly limited to Mars and deep space astronomy, I decided today to dig into the archive of the probe Cassini, which orbited Saturn from July 1, 2004 until September 15, 2017, when it was sent plunging into the gas giant’s atmosphere.

The picture to the right heralded the start of that mission, in that it was taken on February 19, 2004, a little over four months before the spacecraft fired its engines and entered orbit. I have rotated the image and cropped it to post here.

When Cassini snapped this picture it was just approaching the gas giant. The image itself is relatively small, with the resolution also relatively poor. You can see one of Saturn’s moons above the planet, but I can’t tell you which one. As noted at the webpage, this is a raw image that has not been “validated or calibrated.”

While not up to the amazing standard exhibited by Cassini’s images during its thirteen year stay at Saturn, it gave us a flavor of the wonders to come. Of all the planets, Saturn might be the most beautiful.

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Congressional budget action appears to just save two of seventeen on-going NASA missions

9:33 am

Though no final budget has yet been approved, based on the language in the budget the House has approved and sent to the Senate, only two of the seventeen on-going missions presently in space are specifically allocated money, thus allowing the Trump administration to zero out funding for the remaining fifteen.

The two missions saved are Osiris-Apex, on its way to the potentially dangerous asteroid Apophis, and the Magnetospheric Multiscale Mission (MMS), four satellites in orbit that observe the Earth’s magnetosphere.

The article at the link is typical of our propaganda press. It clearly opposes any cuts to NASA, and lobbies repeatedly for all funding to be reinstated. This pattern has gotten quite boring and tedious. It would be so refreshing to see a more objective take, at least one in a while.

However, its reporting confirms my own reporting from mid-September, where I noted that the vague language in the House budget bill would allow Trump to cut these missions. Congress wants to preen itself as supporting all funding for NASA, while carefully allowing Trump to go ahead with large cuts.

It is a good thing these two missions have been saved, though it does appear their funding has been trimmed. Of the fifteen missions in limbo, the only two that seem worth keeping is the Chandra X-Ray Observatory and New Horizons, though the second should likely be set up similar to the two Voyager spacecraft, with a very small crew aimed mainly at keeping the spacecraft functioning and able to send back data periodically.

We are in great debt. It is time that the federal government make some real choices. We can no longer afford to buy all the candy in the store.

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New study claims the giant impact that created the Moon’s South Pole-Aitken Basin was oblique, from the south

9:14 am

South Pole-Aitken Basin
Click for original. Blue indicates the basin, red
the “thorium-rich and iron-rich ejecta deposit”

While previous work had suggested the giant bolide that had created the Moon’s South Pole-Aitken Basin came in from the north, a new study now proposes that the impact was instead oblique from the south. From the paper’s abstract:

The ancient South Pole–Aitken impact basin provides a key data point for our understanding of the evolution of the Moon, as it formed during the earliest pre-Nectarian epoch of lunar history, excavated more deeply than any other known impact basin, and is found on the lunar far side, about which less is known than the well-explored near side. Here we show that the tapering of the basin outline and the more gradual topographic and crustal thickness transition towards the south support a southward impact trajectory, opposite of that commonly assumed. A broad thorium-rich and iron-rich ejecta deposit southwest of the basin is consistent with partial excavation of late-stage magma ocean liquids.

These observations indicate that thorium-rich magma ocean liquids persisted only beneath the southwestern half of the basin at the time of impact, matching predictions for the transition from a global magma ocean to a local enrichment of potassium, rare-earth elements and phosphorus (KREEP) in the near-side Procellarum KREEP Terrane.

In other words, when this impact occurred, part of the impact site in the south was still a magma ocean.

This result, if confirmed, has research implications for the missions targeting the Moon’s south pole. It suggests the geology will have that KREEP materials readily available, which will provide important information about the Moon’s early geological history.

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AST SpaceMobile signs up Verizon to use its constellation for phone-to-satellite service

8:40 am

The startup AST SpaceMobile, which is building a constellation of satellites able to act as cell towers for smart phones, has now signed an agreement with Verizon to give its subscribers access to the service.

AST SpaceMobile’s shares closed up more than 8% Oct. 8 after Verizon joined AT&T in signing a definitive agreement to use its planned space-based cellular network, easing investor concerns about SpaceX’s aggressive push into the fledgling direct-to-device (D2D) market.

The deal enables Verizon to provide D2D connectivity to its customers from some point in 2026, building on a strategic partnership announced in May 2024 that included plans for a $100 million investment in AST.

As noted above, AST has now signed both Verizon and AT&T, two of the largest cellphone companies, strengthening its position considerably in its competition with SpaceX’s Starlink cell-to-satellite alternative. Both deals appear to allow these companies the ability to sign contracts with both AST and Starlink, so it is possible the competition won’t be as fierce initially as it appears. It is also possible that eventually they will pick one or the other, so neither company should be complacent.

AST presently has five of its BlueBird satellites in orbit out of its planned 45-60 satellite constellation, and hopes to have at least half the constellation in orbit by the end of ’26. So even if it wins its cellphone competition with SpaceX that rocket company will still likely make some money launching AST’s satellites.

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October 8, 2025 Quick space links

3:19 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.

  • Hams confirm Juno is still operating
    It apparently transmitted a signal back to Earth. This however has no bearing on whether the mission will survive the budget process. Right now I remain very skeptical it will.
  • A detailed long article describing China’s government space program
    A very nice summary, though as Jay notes, “if a little alarmist.” It is part of the swamp’s tag team effort to convince Americans we need to give NASA and the Pentagon lots of money or else China will destroy us. Meanwhile, all we really need to do is clear the way for private competition and American ingenuity and China will be left in the dust.
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Martian winds are faster than expected

2:46 pm

According to an analysis of pairs of 300 hundred orbital images taken seconds apart, scientist have found that Martian winds can reach speeds of 100 miles per hour (160 kilometers per hours), much faster than previously expected.

The results show that the dust devils and the winds surrounding them on Mars can reach speeds of up to 44 m/s, i.e. around 160 km/h, across the entire planet, which is much faster than previously assumed (previous measurements on the surface had shown that winds mostly remain below 50 km/h and – in rare cases – can reach a maximum of 100 km/h). The high wind speed in turn influences the dust cycle on the Red Planet: “These strong, straight-line winds are very likely to bring a considerable amount of dust into the Martian atmosphere – much more than previously assumed,” says Bickel. He continues: “Our data show where and when the winds on Mars seem to be strong enough to lift dust from the surface. This is the first time that such findings are available on a global scale for a period of around two decades.”

You can read the paper here. The study also found dust devils favor the spring and summer in both the north and south hemispheres, and tended to be concentrated in the mid-latitudes.

What is most interesting about this data, which because it is somewhat sparse has a lot of uncertainties, is that it suggests the candidate landing zone for SpaceX’s Starship is a region with one of the most intense dust devil seasons every spring and summer. This is not really a threat to settlement, because the atmosphere is so thin even these high winds would hardly be felt, but it does indicate an environmental condition that must be considered for any future settlement there.

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Fresh slope streak on Mars

1:09 pm

Fresh slope streak on Mars
For original images go here and here.

Cool image time! One of the geological mysteries on Mars seen no where on Earth is something scientists have dubbed “slope streaks.” Though they at first glance appear to be avalanches, they do nothing to change the topography, have no debris pile at their base, and sometimes even travel up and over rises on their way downhill. They can also appear randomly throughout the year, can be bright or dark, and fade with time.

No theory as to their cause has yet been accepted, though recent research suggests they are dry events, dust avalanches triggered by dust devils, wind, or the accumulation of dust.

To better understand this geology, scientists repeatedly monitor known slope streak locations looking for changes. The two images to the right are an example, downloaded from the high resolution camera on Mars Reconnaissance Orbiter (MRO) on July 2, 2024 and September 1, 2025. In the fourteen months that passed between the first and second images, two distinct and large slope streaks occurred next to each other, near the bottom of the picture. All the other streaks merely faded.
» Read more

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Canadian rocket startup Nordspace obtains expanded ground station contract

9:28 am

Proposed Canadian spaceports
Proposed Canadian spaceports

The Canadian rocket startup Nordspace has signed an agreement with the ground station company C-Core to establish more tracking and communication facilities in conjunction with Nordspace’s launch plans at its Atlantic spaceport in Newfoundland.

NordSpace and C-CORE have signed a Memorandum of Understanding (MOU) that will see the companies work together in developing new ground stations across Canada with initial locations planned for the Atlantic Spaceport Complex (ASX) in St. Lawrence, Newfoundland and Labrador, and Inuvik, Northwest Territories.

With C-CORE being based in St. John’s, Newfoundland, and already established in providing ground station services, it seems like a natural collaboration that could benefit both companies. For NordSpace, which owns and is developing the Atlantic Spaceport Complex, this collaboration provides the potential for another type of revenue source as the company tries to diversify.

Nordspace has not yet launched, though its first suborbital test launch several weeks ago was scrubbed twice due to ground equipment fuel leaks. It has not yet announced another date for that suborbital test, but plans a static fire test in October of the engine it is building for its orbital Tundra rocket.

This company is only three years old, and appears to have leap-frogged past Canada’s other spaceport operation in Nova Scotia, which has been trying to get off the ground for almost a decade.

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Stoke Space said to be raising as much as $500 million in private investment capital

9:17 am

Stoke's Nova rocket
Stoke’s Nova rocket, designed to be
completely reusable.

UPDATE: Stoke Space confirms the story, announcing today that it has raised $510 million in new capital.

According to anonymous sources, the rocket startup Stoke Space is in the process of raising as much as $500 million in private investment capital, with new $2 billion valuation for the company.

Stoke Space, one of the Seattle area’s up-and-coming space startups, is said to be raising hundreds of millions of dollars in a funding round that it hasn’t yet publicly acknowledged. A report about the round, based on two unidentified sources, was published today by The Information.

The Information quoted its sources as saying that the funding round could total as much as $500 million, and would value Stoke at nearly $2 billion. That figure would be roughly twice as much as the $944 million valuation that was cited by Pitchbook as of January. The round’s lead investor is said to be Thomas Tull’s United States Innovative Technology Fund.

Earlier this year Stoke raised $260 million, bringing its available capital to almost a half billion. If this story is confirmed, it means the company will have almost a billion in available cash on hand.

The design of Stoke’s Nova rocket is unique in that both the lower and upper stages will be reusable. The first stage will land vertically, like SpaceX’s Falcon 9. The upper stage meanwhile uses a radical nozzle design, a ring of tiny nozzles around the perimeter of a heat shield, to protect it during re-entry.

The company has said it plans the first launch in 2026, but has not been more specific as to when. If successful, this rocket will certainly become a major player, as it will be able to offer even lower prices than SpaceX because none of the rocket will be expendable.

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First image from Mars of interstellar Comet 3I/Atlas

9:02 am

Comet 3I/Atlas as seen from Mars
Click for original image.

Using the Europe’s Trace Gas Orbiter (TGO) presently orbiting Mars, scientists have successfully obtained the first images from Mars of interstellar Comet 3I/Atlas using its Colour and Stereo Surface Imaging System (CaSSIS).

They have compiled a short movie of those images, with one of those pictures to the right, cropped to post here. As expected, the observation was difficult and somewhat limited in the data it could obtain.

CaSSIS could not distinguish the nucleus from the coma, because 3I/ATLAS was too far away. Imaging this kilometre-wide nucleus would have been as impossible as seeing a mobile phone on the Moon from Earth.

But the coma, measuring a few thousand kilometres across, is clearly visible. The coma is created as 3I/ATLAS approaches the Sun. The Sun’s heat and radiation is bringing the comet to life, causing it to release gas and dust, which collects as this halo surrounding the nucleus. The full size of the coma could not be measured by CaSSIS because the brightness of the dust decreases quickly with distance from the nucleus. This means that the coma fades into the noise in the image.

Typically, material from the coma is swept into a long tail, which can grow up to millions of kilometres long as the comet moves closer to the Sun. The tail is much dimmer than the coma. We can’t see the tail in the CaSSIS images, but it may become more visible in future observations as the comet continues to heat up and release more ice.

The science team for Europe’s Mars Express orbiter also attempted to get data of the comet, but have not yet been able to detect it. Both orbiters also tried to get spectroscopy, but no data was obtained because the comet is presently too faint and distant for these instruments.

More observations are planned, not only from these orbiters but also from Europe’s Juice spacecraft on its way to Jupiter but presently in the inner solar system somewhat near the Sun. It will make its observations in November, but won’t be able to transmit the data back until February, after it has gotten more distant from the Sun.

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SpaceX launches 28 Starlink satellites, reuses 1st stage for 29th time

8:31 am

SpaceX last night successfully launched another 28 Starlink satellites, its Falcon 9 rocket lifting off from Vandenberg Space Force Base in California.

The first stage, B1071, completed its 29th flight, landing on a drone ship in the Pacific. The present rankings for the most reflights of a rocket:

39 Discovery space shuttle
33 Atlantis space shuttle
30 Falcon 9 booster B1067
29 Falcon 9 booster B1071
28 Columbia space shuttle
28 Falcon 9 booster B1063
27 Falcon 9 booster B1069

Sources here and here.

Note also that SpaceX was able to refly this stage only 24 days after its previous flight. Even after 28 flights, the booster appears so robust the company can get it back in the air only weeks later.

The leaders in the 2025 launch race:

129 SpaceX
58 China
13 Russia
12 Rocket Lab

SpaceX now leads the rest of the world in successful launches, 129 to 98. SpaceX has another launch scheduled for this evening, placing another set of Amazon’s Kuiper satellites into orbit.

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