Modern WisdomThe Insane Biological Cost of Living on Mars - Scott Solomon
At a glance
WHAT IT’S REALLY ABOUT
Mars settlement may be possible, but at immense biological cost
- Scott Solomon uses Mars-settlement scenarios (and NASA’s CHAPEA analog habitat) to argue that living on Mars would be less a technological triumph than an evolutionary and biological upheaval.
- He outlines how microgravity and partial gravity degrade muscle, bone, blood volume, and vision, while deep-space radiation raises cancer risk and may impair cognition—effects we don’t fully understand or know how reversible they are.
- Over generations, higher mutation rates, founder effects, isolation, and microbe divergence could accelerate human divergence from Earth—potentially limiting travel between planets and pushing toward speciation.
- The discussion extends to governance, team psychology, reproduction as the biggest unknown, and ethical dilemmas: whether it’s acceptable to impose irreversible risks on children and whether genetic interventions would be justified or obligatory.
IDEAS WORTH REMEMBERING
5 ideasMars analogs primarily test psychology, not true Mars physics.
CHAPEA-like simulations can recreate confinement, resource limits, and group dynamics, but they can’t replicate 1/3 gravity or deep-space radiation—two of the most consequential biological variables.
Microgravity triggers whole-body deconditioning that exercise reduces but doesn’t eliminate.
In weightlessness, muscles weaken, bones lose mineral density, fluids shift upward (puffy “space face”), and the body reduces blood volume and red blood cell production—often returning astronauts anemic.
Deep-space radiation is a major unknown with risks beyond cancer.
ISS astronauts are partly shielded by Earth’s magnetosphere; traveling to Mars exposes crews to more galactic cosmic rays. Evidence from animal studies suggests potential cognitive slowing, but reversibility and dose effects in humans remain unclear.
Arriving on Mars could be physically brutal after months in microgravity.
Transitioning from weightlessness to ~1/3 g still represents a large loading change, making basic mobility and emergency tasks difficult—especially without assistance or robust countermeasures.
Higher radiation likely increases mutation rates—speeding evolution but at a human cost.
Mutations generate variation for adaptation, yet most mutations are harmful; faster evolutionary “experimentation” implies more illness, suffering, and death unless mitigated by technology or selection management.
WORDS WORTH SAVING
5 quotesOnce you start talking about a multiple generation presence on another world, we should expect evolutionary change.
— Scott Solomon
Astronauts essentially will kind of time out… if they have reached a radiation exposure that NASA deems to be too risky.
— Scott Solomon
We don’t know… [how reversible these effects are].
— Scott Solomon
If we do nothing else… you are kickstarting the evolutionary process. It would happen faster… [but] that’s a very messy and unpleasant process.
— Scott Solomon
The bottom line is we don’t know… [whether] human reproduction is possible in the conditions on Mars.
— Scott Solomon
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