Joe Carroll talks spin and artificial gravity. Joe made a special presentation to this program that you will want to see.

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We talked about a a space-themed presentation about multi-planetary topics and artificial gravity research. We explored various aspects of space colonization, including the challenges of low gravity environments, the feasibility of artificial gravity solutions, and the potential for space tourism and medical research. The discussion concluded with a seven-step sequence for space exploration and considerations for future space missions, emphasizing the need for practical solutions and sustainable funding to advance human space travel. Space Show participants included Marshall Martin, Phil Swan, Dr. Ajay Kothari, and John Hunt.

I introduced the evening’s space show, highlighting upcoming guests and discussing the ongoing transition of podcasting to Substack. I announced several upcoming shows, including Hotel Mars with Anatoly Sack, Dr. Benaroya discussing lunar habitats, and Sam Jimenez from Astroport Space Tech. David welcomed Joe Carroll, an expert on advanced space transportation and artificial gravity, who would be sharing his presentation later in the show. I reminded listeners about the non-profit status of the show and encouraged support for their annual campaign.

Joe discussed the current state of artificial gravity research, noting that while NASA’s commercial lunar destinations program includes it as a stretch goal, no immediate plans exist for funding. He highlighted efforts by VAST, founded by Jeb McCallab, and Blue Origin, both of which are seriously interested in artificial gravity for long-term human health on the Moon and Mars. Our participants agreed that research into the effects of different gravity levels on human health is crucial for future space exploration, with Marshall suggesting that the Stanford Torus could be a valuable tool for such research.

Our Space Show Zoom participants discussed the feasibility and challenges of colonizing Mars, focusing on the cost implications of one-way trips versus round trips, and the potential for raising families in low Martian gravity. They explored the idea of building a space station to simulate Martian gravity and investigate the effects of long-term exposure to low gravity on human health, particularly in terms of radiation exposure. Joe suggested conducting research on animals to understand the impact of low gravity on human physiology, while Marshall raised questions about the relationship between gravity and radiation exposure. The conversation concluded with a discussion on the potential benefits of establishing a settlement in equatorial low Earth orbit as a stepping stone to Mars colonization, though David noted the lack of concrete action towards addressing the gravity problem.

The group discussed two main topics: the effects of microgravity on human health and the feasibility of artificial gravity in space travel. Joe explained that while short-term stays in microgravity (up to 3 months) don’t cause severe health problems, longer missions of 6-12 months could lead to coordination issues upon return. Regarding artificial gravity, Joe noted that while rotating rooms have tested different spin rates, the experience would be significantly different in a spacecraft due to the gravity gradient. The group agreed that more tests are needed to determine the optimal spin radius and speed for human comfort in space, potentially using Crew Dragon for these experiments.

Joe presented a detailed analysis of artificial gravity solutions for multi-planetary settlements, focusing on Moon and Mars gravity levels. He outlined seven distinct tests needed to determine the feasibility of artificial gravity, including ground-based simulations and Crew Dragon experiments. Joe emphasized the importance of testing these concepts in Earth orbit before attempting lunar or Martian settlements, due to the high costs and long travel times associated with space missions. He also discussed the potential for tourism to drive the development of artificial gravity technology and the need to determine the optimal gravity level for human health and comfort in space settlements.

Joe discussed the design and functionality of a space facility that simulates Moon and Mars gravity through rotation at different speeds. He emphasized the importance of testing human health impacts in long-term low-gravity environments and highlighted the challenges of recycling and space constraints in future Mars missions. Marshall inquired about wet launch theories, and Joe explained the potential for pre-launch modifications to space vehicles for expanded functionality. Joe concluded that future space missions would require more space and gravity simulation, suggesting that Elon’s current plans for Mars missions might need adjustments.

Joe and David discussed the feasibility of a space project, focusing on the potential use of Starship for missions to Mars and the challenges involved. Joe expressed concerns about the practicality of sending people to Mars without proper preparation and suggested alternative locations for a launch site near the equator. They explored the possibility of securing funding from billionaires or innovative VCs, as government support seems unlikely. Joe estimated that the project could be completed within 5 years with adequate funding.

The discussion focused on inflatable space structures, with Joe and David sharing insights about existing military and commercial applications, including Bigelow’s earlier work and Sierra Space’s current developments. They agreed that while there’s significant interest in commercial space ventures, many startups face challenges in securing sustainable funding without clear operational revenue streams, noting that current market conditions offer numerous alternative investment opportunities. The conversation concluded with David emphasizing the need for a well-defined and practically ready project to attract serious investment, rather than just theoretical concepts.

The group discussed the challenges and costs associated with space tourism and medical research in space. Marshall suggested that reducing the cost per pound to orbit could make space tourism feasible, but Joe pointed out that current launch costs are too high for widespread access. David emphasized the need for a commercial revenue stream to fund space activities, while Phil proposed creating a medical research lab in low Earth orbit with a 30-year return on investment. The conversation touched on the potential for pharmaceutical companies to fund such a project, but acknowledged the lack of current plans or funding for such initiatives.

Joe discussed a seven-step sequence for space exploration, emphasizing the importance of gradual progress and building public trust. The group discussed the challenges and potential of sending humans to Mars, with John raising concerns about the lack of return capability. Phil emphasized the need for long-term arguments to create support for short-term plans, while Joe shared his experience with NASA funding and the visibility of space stations. The show concluded with plans for future discussions and a reminder to “keep looking up.”

Special thanks to our sponsors:Northrup Grumman, American Institute of Aeronautics and Astronautics, Helix Space in Luxembourg, Celestis Memorial Spaceflights, Astrox Corporation, Dr. Haym Benaroya of Rutgers University, The Space Settlement Progress Blog by John Jossy, The Atlantis Project, and Artless Entertainment

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Upcoming Programs:

Broadcast 4446: ZOOM Dr. Haym Benaroya | Friday 17 Oct 2025 930AM PT

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Broadcast 4447: ZOOM Sam Ximenes of Astroport Space Technologies | Sunday 19 Oct 2025 1200PM PT

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