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NASA compared twin astronauts to see if space ages the human body
A NASA study that compared two twins, one who finished a nearly year-long mission in space and one who spent that time in Earth, found that most of the dramatic changes that happen to the human body in space aren't permanent. Scott Kelly, who was aboard the International Space Station between 2015 and 2016, experienced many physical and genetic changes that his twin brother and fellow astronaut Mark Kelly, who was back on Earth, did not. But once the Kelly brother who was in space landed, his body gradually returned to normal. Some negative impacts from the mission still linger on Kelly, posing a challenge for scientists as they explore longer space flight, such as travel to Mars.
