Conscious Choice cover

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 founder of the Mars Society.


Available everywhere for $3.99 (before discount) at Amazon, Barnes & Noble, and all ebook vendors, or direct from the ebook publisher, ebookit. And if you buy it from ebookit you don't support the big tech companies and I get a bigger cut much sooner.

ULA to temporarily stop using new engine nozzle because of vibration issue

Capitalism in space: Because of an unexpected vibration issue seen during its first launches, ULA engineers have decided to temporarily stop using a new engine nozzle developed for the upper stage of both its Atlas 5 and new Vulcan rocket.

ULA’s CEO Tory Bruno said June 23 that the company is studying the data from the flight and has not yet decided what corrective action, if any, it might take. In the meantime, the new version of the RL10 [engine] with the carbon nozzle extension will not be used in upcoming Atlas 5 missions, Bruno said during a talk at the Secure World Foundation’s Summit for Space Sustainability.

Concerns about vibrations in the engine led ULA to delay the launch of the Space Force STP-3 mission that had been scheduled for June 23 and was planned to fly with the enhanced RL10. The company has not announced a new launch date for STP-3. ULA first plans to launch Boeing’s Starliner Orbital Flight Test 2 mission to the International Space Station scheduled for July 30. “It’ll be several missions, probably next year” before ULA decides whether to fly the RL10 configuration with the nozzle extension, said Bruno. The company wants to be “fully satisfied that we understand it.”

Below the fold is the live stream from that May launch, cued to show that vibration. It is their intention to go back to the older nozzle configuration for the next few launches.


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  • mkent

    This shows the value of test flying the avionics, boosters, fairings, and upper-stage engines on Atlas before Vulcan flies. They now have time to solve these issues while still flying a configuration that can get their customers’ payloads to orbit. Good on ULA for doing this.

  • Jeff Wright

    J-2 was heavy but simple. They should have went bigger but with less part count.

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