August 28, 2025 Quick space links

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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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

Another great hiking location on Mars

Another great hiking location on Mars
Click for original image.

In honor of our just completed visit to the south rim of the Grand Canyon, today’s cool image takes us to another location on Mars that to me appears a perfect place to install some hiking trails. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 30, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

The image shows a two-mile wide canyon with a number of scattered narrow mesas within. The north and south rims rise about 550 feet above the canyon floor. The two mesas labeled “A” and “B” rise about 200 and 100 feet respectively.

The hiker in me immediately imagines what a great hike it would be to go up the western nose of either ridge and walk along its crest. The knife-edge nature of ridge “A” would mean that for a large majority of the hike you’d be at the north and south edges at the same time.
» Read more

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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.

August 27, 2025 Quick space links

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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Sand dunes inside the Martian north polar icecap

Sand dunes inside the Martian north polar icecap
Click for original image.

Today’s cool image returns to the Martian north pole. The picture to the right, rotated, cropped, reduced, and enhanced to post here, was taken on July 3, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows the top of a ridge near the edge of that icecap, with dunes visible in the hollow several thousand feet below.

The angle of this picture does not show us the many layers on the cliff leading down to those dunes. It does show evidence, however, of the top few layers on the flat crest of that ridge. The white lines delineate those layers, each line marking the edge of a series of wide terraces.

The dunes in the canyon below are of interest because their source is likely the dust that is mixed into thick icecap’s ice. As that ice sublimates away on the face of the cliff, the dust falls into the canyon, where it is trapped.
» Read more

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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

Both before and after its Starship launch yesterday, SpaceX also completed two Falcon 9 launches

The past 24 hours SpaceX did more than complete its stunningly successful tenth launch of its Starship/Superheavy rocket. The company also launched its Falcon 9 rocket twice from opposite coasts.

First it launched a commercial Earth observation satellite, built by the European company OHB Italia for Luxembourg, its Falcon 9 lifting off from Vandenberg in California. The first stage completed its 27th flight, landing back at Vandenberg..The launch also placed several smallsats in orbit as well.

Then this morning, ten hours after the Starship/Superheavy launch, another Falcon 9 rocket lifted off from Cape Canaveral, placing another 28 Starlink satellites in orbit. The first stage completed its second flight, landing on a drone ship in the Atlantic.

After including all three SpaceX launches, this is the leader board for the 2025 launch race:

107 SpaceX
48 China
12 Rocket Lab
11 Russia

SpaceX now leads the rest of the world in successful launches, 107 to 84.

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The most powerful rocket ever, built and financed by a private company, has a near perfect tenth test flight

LIberty enlightens the world
Liberty quite literally enlightening the world

In the tenth test orbital flight of SpaceX’s Starship/Superheavy rocket today, the company has what appeared to be a near perfect flight.

First the Superheavy booster worked as intended, completing a new return configuration to reduce stress, completing a soft vertical splashdown in the Gulf of Mexico. During the landing the company tested using backup engines instead of the normal engines to see if this would work in future situations where an engine failed. This worked.

Next, Starship reached its low orbit, intended to end over the Indian Ocean. Unlike the last two test flights, the ship functioned as planned.

Starship completed a full-duration ascent burn and achieved its planned velocity, successfully putting it on a suborbital trajectory. The first in-space objective was then completed, with eight Starlink simulators deployed in the first successful payload demonstration from Starship. The vehicle then completed the second ever in-space relight of a Raptor engine, demonstrating a key capability for future deorbit burns.

Moving into the critical reentry phase, Starship was able to gather data on the performance of its heatshield and structure as it was intentionally stressed to push the envelope on vehicle capabilities. Using its four flaps for control, the spacecraft arrived at its splashdown point in the Indian Ocean, successfully executed a landing flip, and completed the flight test with a landing burn and soft splashdown.

Some burn through damage on Starship was seen, but relatively little, despite the decision to stress the flaps and the reduce the coverage of the heat shield. The landing was on target, an even more impressive achievement.

As must be repeated over and over, this was a test flight of prototypes. The final version of both Superheavy and Starship will not be the same. The flight tested preliminary designs and capabilities, the data obtained to then be used to redesign and revise both components of the rocket.

The most significant aspect of this test flight however is its funding. » Read more

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August 26, 2025 Quick space links

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.

7 comments

The beauty of Mars’ many-layered northern icecap

The beauty of Mars' ice cap
Click for original image.

Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on July 1, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

The science team labels it clumsily as “North Polar layered deposits structural geology in icy layers”. What we see are the many layers that make up the north polar cap, produced by the red planet’s many climate cycles that scientists think Mars has undergone over the eons as the red planet’s rotational tilt, or obliquity, rocked back and forth from 11 degrees inclination to as much as 60 degrees. At the extremes, the ice cap was either growing or shrinking, while today (at 25 degrees inclination) it appears to be in a steady state.

These layers are a mixture of ice and dust. The variations from dark to light likely indicate changes in the amount of dust in the atmosphere. Dark layers suggest the atmosphere was more dusty due to volcanic eruptions. Light layers suggest the planet’s volcanic activity was more subdued.

At least that’s one hypothesis.
» Read more

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On the road today

Diane and I are on the road today, leaving the Grand Canyon, which remains as grand as ever, and heading to Colorado to visit friends we haven’t seen since before the COVID panic.

Thus, I will likely not be able to watch today’s third attempt by SpaceX to complete the tenth launch of its Starship/Superheavy rocket, as it happens.. (Live stream can be found here.)

Once settled in Colorado I will catch up. Like you all, I have my fingers crossed that the launch will go off as hoped with a largely successful test flight.

One fortunate thing that has occurred during the previous two launch attempts in the past two days is that it appears the protest of boats proposed by a Mexico radical activist group to block the launch has so appeared to be a bust. There has been no indication of any boats entering the launch range in the Gulf of Mexico, and if any have tried, it appears they have been removed quickly.

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