Space nerds, has SpaceX talked publicly at all about the en-route obstacles to a Mars mission (radiation, deconditioning, closed-loop life support) and how it plans to address them? I can find stuff about launch and landing but not the middle part that is the actual dealbreaker.
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It's not going to kill them on the way or in the first months/years on Mars, so I don't see how it would stop the first missions. Might be different for long term settlement, but I don't believe that's feasible anyway.
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It might compound bone loss to the point where someone breaks a hip on Mars, or severely degrade eyesight. Those are the mission risks.
End of conversation
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we know way more about long term exposure then what a 3 month journey will expose passengers to
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Cosmic rays are not stopped by the magnetosphere. They are stopped by the Earth, so reduced no more than half in Low Earth orbit vs interplanetary space. Shelter is needed for solar flares, which are stopped by the magnetosphere. They are directional, though, so easy to shield.
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