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You needn't fry on Mars. Readings from NASA's Curiosity rover suggest radiation levels on the Red Planet are about the same as those in low Earth orbit, where astronauts hang out for months on the International Space Station. A Mars visit would still be dangerous though, due to the years-long return trip.

Unlike Earth, Mars has no magnetosphere shielding it from solar and galactic radiation. But it does have a thin atmosphere, and readings from two of Curiosity's instruments suggest this provides some protection.