Add Yahoo as a preferred source to see more of our stories on Google. Twin brothers and former NASA astronauts Mark and Scott Kelly have each flown four missions and were part of NASA's twin study to ...
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NASA study shows space travel changed an astronaut's DNA
NASA’s twin study shows how space travel can alter DNA.
A better understanding of the electrical activity within auroras could help us protect our astronauts and satellites. When you purchase through links on our site, we may earn an affiliate commission.
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