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[–]Musky 5 insightful - 2 fun5 insightful - 1 fun6 insightful - 2 fun -  (0 children)

It's not an instant death sentence, but their DNA is scrambled now. https://www.space.com/astronaut-spaceflight-cancer-dna-mutations-study

It's one of the reasons space travel with chemical rockets is not viable. Also, even the speed of light is too slow to get anywhere.