The only way you protect from radiation is Time, Distance and Shielding.
They’re limited on what they can do with distance so they have to rely on time and shielding. Spacecraft and spacesuits are made with built in shielding to reduce the amount of radiation and they orient themselves and their craft in a way that puts the most “stuff” between people and radiation sources. And they also don’t spend a whole lot of time up in space.
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