How are humans affected by spending a long time in space? To find out, NASA turned to twin astronauts Scott and Mark Kelly. While Mark stayed on Earth, Scott spent a year aboard the International Space Station, returning in March 2016. He and Mark underwent a series of medical tests before and after the mission. The result? A year in space affected the composition of Scott’s DNA, slowed his reflexes, and even temporarily made him two inches taller. And the ends of Scott’s
The ‘Twins Study’
Astronauts Mark (left) and Scott Kelly are helping NASA prepare for Mars missions.
Astronauts Mark (left) and Scott Kelly are helping NASA prepare for Mars missions.
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