NASA’s Twins Study reveals effects of space on Scott Kelly’s health

A comparison with his twin looks at the impact of long-term spaceflight on the human body

Kelly twins

TWINS APART  Astronaut Scott Kelly (left) spent a year in space on the International Space Station while his identical twin brother, astronaut Mark Kelly (right), remained on Earth. They were part of a landmark study to help researchers understand how spaceflight affects the human body. 


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