ULA launches 29 Leo satellites for Amazon

8:31 am

ULA early this morning successfully placed 29 Leo satellites for Amazon’s internet constellation, its Atlas-5 rocket lifting off from Cape Canaveral Space Force station in Florida.

This was the heaviest Atlas-5 payload so far launched by ULA, and ULA’S fifth launch for Amazon’s Leo constellation, which now has 241 satellites in orbit, out of the 1,616 it needs to launch by July to meet its FCC license requirement. Because it is not expected to meet that requirement, the company has asked for a time extension, which the FCC is presently considering.

ULA is in the process of retiring the Atlas-5 rocket. It now has only nine Atlas-5 rocket left in stock, with three reserved for Leo launches and six for Boeing’s Starliner manned capsule (though there is a good chance some if not all of the Starliner launches will be switched to other payloads).

This was also ULA’s second launch in 2026, which means the leader board for the 2026 launch race remains unchanged:

41 SpaceX
16 China
5 Rocket Lab
5 Russia

SpaceX continues to lead the entire world combined in total launches, as it did in both ’24 and ’25.

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Diana Damrau – Queen of the Night

6:04 pm

An evening pause: From Mozart’s The Magic Flute, performed by the Royal Opera. If the closed captions are off, turn them on, as they provide a translation.

As “the fat lady” has now sung, we can go off and enjoy the weekend.

Hat tip Blair Ivey.

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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 or any other book seller. If you want an autographed copy the price is $60 for the hardback and $45 for the paperback, plus $8 shipping for each. Go here for purchasing details. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from 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

Voyager-2’s most detailed look at Neptune’s moon Triton

3:10 pm

Triton
Click for original image.

Today we conclude our tour of the Voyager-2 fly-bys of Uranus in 1986 and Neptune in 1989 with what is the most detailed look at the alien surface of Neptune’s moon Triton, taken on August 25, 1989 and shown to the right, cropped, rotated, reduced, and sharpened to post here.

Taken from a distance of only 25,000 miles, the frame is about 140 miles across and shows details as small as [a half mile in width]. Most of the area is covered by a peculiar landscape of roughly circular depressions separated by rugged ridges. This type of terrain, which covers large tracts of Triton’s northern hemisphere, is unlike anything seen elsewhere in the solar system. The depressions are probably not impact craters: They are too similar in size and too regularly spaced. Their origin is still unknown, but may involve local melting and collapse of the icy surface.

A conspicuous set of grooves and ridges cuts across the landscape, indicating fracturing and deformation of Triton’s surface. The rarity of impact craters suggests a young surface by solar system standards, probably less than a few billion years old.

What this photograph as well as the handful of other Voyager-2 images of Triton tell us is that we only have gotten a tiny taste of what’s there, only enough to tell us we don’t understand what we are seeing in the slightest. This is a truly alien world, cold, dark, and composed of materials far different then that found in the inner solar system. Its formation is a mystery, and its subsequent geological history a cypher. Scientists have made some guesses, but to get a real understanding we need to go back, and be there for a long time.

In fact, this is the final conclusion of all of the Voyager-2 images from both Uranus and Neptune. That probe gave humanity its first good close look at these distant worlds, but the look was still a quick and very superficial one. The images and data left us with far more questions than answers.

Unfortunately, there is at present no mission approved and under development to go to either Uranus or Neptune, though several have been proposed. Thus, it will likely be at least two decades before any mission gets there, if that soon.

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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.

SpaceX delays next Starship/Superheavy orbital test flight by about a month

2:30 pm

According to a tweet by Elon Musk today, the 12th orbital test flight of Starship/Superheavy is not going to happen in mid-April as previously hoped.

Instead, it is now pushed back to early to mid-May.

Next flight of Starship and first flight of V3 ship & booster is 4 to 6 weeks away.

In his tweet, “V3” refers to the third version of both Starship and Superheavy, incorporating many upgrades learned from the first eleven test flights. Version three will also be the first to use SpaceX’s Raptor-3 engine, the most powerful rocket engine ever built but with a much simplified design.

It is not clear what has caused this delay. The last test flight was in October 2025, which means there will be eight month gap between test launches, a much longer gap than desired by the company. Part of the delay was because the company was building a whole new launchpad for the rocket. Also, there were two tank failures during static fire tests of Superheavy that needed investigation and as well as pad repairs.

Still, time is marching on. SpaceX needs to launch this rocket, and begin doing it at a much faster pace. It can no longer complain about red tape, as under Trump that issue has been squashed quite effectively.

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Russia launches classified military payload; China has a launch failure

9:11 am

There were two additional launch attempts yesterday by China and Russia, with mixed results.

First, the Chinese pseudo-company Space Pioneer attempted the first launch of its Tianlong-3 rocket, designed essentially as a Falcon 9 copy. China’s state-run press provided no details of the failure, but video of the launch appeared to show uneven engine thrust beginning at about 33 seconds after launch, and the rocket terminating its flight about two minutes later.

Next, Russia placed a classified military payload into orbit, its Soyuz-2 rocket lifting off from its Plesetsk spaceport in northwest Russia. It is believed this could be a military communications satellite, but this is also unconfirmed. The rocket dropped its lower stages and fairings at several different places inside Russia.

The leaders in the 2026 launch race:

41 SpaceX
16 China
5 Rocket Lab
5 Russia

SpaceX continues to lead the entire world combined in total launches, as it did in both ’24 and ’25.

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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

Amazon responds to SpaceX’s FCC complaint about its last Leo satellite launch

8:57 am

Amazon Leo logo

Amazon yesterday submitted a letter [pdf] to the Federal Communications Commission (FCC) responding to SpaceX’s FCC complaint earlier this week that accused it of using Arianespace’s Ariane-6 rocket to place 32 Leo satellites in a 450 kilometer orbit — 50 kilometers more than its license allowed — causing SpaceX to maneuver 30 of its own Starlink satellites to avoid any collisions.

In its response, Amazon claimed the higher orbit was not a violation, that its original license allowed for orbits “at or above 400 kilometers”, and that the problem was really caused by SpaceX’s decision in the past few months to lower the orbits of its Starlink satellites to a 462 to 485 kilometers. It also accused SpaceX of refusing to compromise when Amazon proposed a solution. Instead, SpaceX demanded Amazon stop launching at this orbit height, a change that Amazon claimed would delay the next few Ariane-6 launches by months.

Despite these claims, Amazon then backed off:

Even so, Amazon Leo has made significant operational changes in response to SpaceX’s concerns. Working with Arianespace, Amazon Leo has committed to lowering its target insertion altitude, beginning with its fourth Ariane mission. Similarly, Amazon Leo is working with its other launch providers to determine if they can lower insertion altitudes without impacting Amazon Leo’s schedule.

In other words, Amazon will do as SpaceX requests, but only do so after it completes three more Ariane-6 launches at this higher orbit.

The FCC now has a choice. If it demands Amazon immediately concede SpaceX’s point, this will likely cause a delay in three Ariane-6 launches of approximately 100 Leo satellites. Amazon’s FCC license requires it to launch 1,616 Leo satellites by July 2026, and at present it only has a little more than 200 satellites in orbit. Because Amazon doesn’t expect to meet this goal, it has already asked the FCC for a time extension.

Thus, it appears this dispute with SpaceX might actually benefit Amazon. If the FCC denies Amazon’s request to launch the next three Ariane-6 missions at this higher orbit, it will also be agreeing to a delay in Leo satellite launches. It will thus be forced to grant Amazon’s request for that time extension. And even if it does allow Amazon to launch at the higher orbit, requiring the two companies to work out any orbital conflicts, that permission will confirm the FCC is going to grant Amazon’s time extension request as well.

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SpaceX launches 29 more Starlink satellites

11:01 pm

The beat goes on: Even as everyone (including myself) was focused on NASA’s Artemis-2 lunar mission, SpaceX remained centered on its own space effort. This evening it placed another 29 Starlink satellites into orbit, its Falcon 9 lifting off from Cape Canaveral Space Force Station in Florida.

The first stage completed its 15th flight, landing on a drone ship in the Atlantic only 23 days after its previous flight.

Below is the leader board for the 2026 launch race, which I had forgotten to include in the previous two launches by SpaceX and NASA. Those posts have now been updated to include it.

41 SpaceX
16 China
5 Rocket Lab
4 Russia

SpaceX continues to lead the entire world combined in total launches, as it did in both ’24 and ’25.

Chinese pseudo-company Space Pioneer was also scheduled today to do the first demo launch of its Tianlong-3 orbital rocket, which appears in many ways to be a Falcon 9 copy. At this moment there are no reports out of China of what happened, though Jonathan McDowell reports on X of speculation that it was a failure. We will know more in a day or so.

Space Pioneer is the pseudo-company that in 2024 had this rocket’s first stage do an unplanned launch during a static fire engine test. That incident delayed this launch attempt by at least one year.

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Orion fires engines and is now on its way around the Moon

4:55 pm

After reviewing the operation of Orion capsule during its first day in orbit, the NASA Artemis-2 management team approved sending the spacecraft to the Moon.

The burn occurred at 7:49 Eastern. The live stream of that burn is embedded below.

At this moment NASA and the crew are committed. No matter what happens, they cannot return to Earth any earlier than about nine days from now. And when they return, they will have to do a direct dive into the atmosphere, heading to splashdown. The Orion heat shield at that point must work.
» Read more

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April 2, 2026 Quick space links

2:45 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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Neptune’s rings, as seen by Voyager-2 in 1989

2:05 pm

The rings of Neptune as seen by Voyager-2
Click for original image.

Cool image time! The picture to the right, cropped, reduced slightly, and sharpened to post here, was taken by Voyager-2 on August 26, 1989 shortly after it had completed its close fly-by of Neptune, looking back at the planet from a distance of about 175,000 miles.

The two main rings are clearly visible and appear complete over the region imaged. … Also visible in this image is the inner faint ring at about 25,000 miles from the center of Neptune, and the faint band which extends smoothly from the 33,000 miles ring to roughly halfway between the two bright rings. Both of these newly discovered rings are broad and much fainter than the two narrow rings.

These long exposure images were taken while the rings were back-lighted by the sun at a phase angle of 135 degrees. This viewing geometry enhances the visibility of dust and allows fainter, dusty parts of the ring to be seen. The bright glare in the center is due to over-exposure of the crescent of Neptune. The two gaps in the upper part of the outer ring in the image on the left are due to blemish removal in the computer processing. Numerous bright stars are evident in the background. Both bright rings have material throughout their entire orbit, and are therefore continuous.

While Voyager-2 took other pictures of these rings (here, here, here, here, and here), I think this picture shows the rings best, if not terrible well. Images using the Hubble and Webb space telescopes as well as others have not been better.

The rings were first confirmed to exist in the mid-1980s, shortly before Voyager-2’s fly-by. We now think there are five rings total, all made of dark material, likely a mix of carbon-based molecules, much of it the equivalent of dust and soot.

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