Scott Kelly Spent a Year in Orbit. His Body Is Not Quite the Same

For 340 days, Scott Kelly circled the Earth aboard the International Space Station, gathering data about himself. Two hundred and forty miles below, Mr. Kelly’s twin brother, Mark, who also served as an astronaut, carried out identical tests. On Thursday, just over three years after Mr. Kelly, 55, returned to Earth, NASA researchers reported that his body experienced a vast number of changes while in orbit.

Source: www.nytimes.com