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I would say, that with our current atmosphere and magnetic field there's not a "direct" threat to life as they shield the Earth. The atmosphere is opaque to X-ray radiation that can come from outside. It seems that much of that opacity comes from water vapor, and the amount of that in the atmosphere changes depending on different factors. X-ray ...


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Abrevaya et al. (2020) in "The UV surface habitability of Proxima b: first experiments revealing probable life survival to stellar flares" (abstract, PDF) say: "Our results show the impact that a typical flare and a superflare would have on life: when microorganisms receive very high fluences of UVC, such as those expected to reach the surface ...


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