This is the same orbital dynamics anyone has to deal with. 4-6 months is very doable. Regarding radiation, if only someone had written a blog on it...pic.twitter.com/o5TvpmCHza
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We don't have the data on what deep-space GCR does to humans, because we have never gone there and there is not such an environment on Earth. GCR flux in deep space includes heavy nuclei whose cumulative effect on eyes, bone, etc. is conjectural. You can't handwave that away.
We've put mice in front of a particle beam; that's about the extent of what we know about the biological impact of heavy ion radiation.
Did you somehow forget ISS again? The heavy ion high energy GCRs are not deflected by the magnetosphere and impact ISS the same as in deep space minus some shielding from Earth itself (which lowers the dose rate but doesn’t eliminate it).
I’m not handwaving it away; you’re falsely saying ISS is invalid. The data ISS has includes the highest energy heavy ion cosmic rays. As you yourself said: It’s only the low energy GCR (which is most like other radiation and has the least uncertainty) that is shielded away on ISS
I'm not saying the ISS data is invalid, but incomplete. It doesn't include what gets deflected by the Earth's magnetosphere, and the overall flux on ISS (because Earth fills half the sky, and because of that magnetosphere) is much less than what you get roasted with in deep space
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