NASA astronaut Scott Kelly speaks during a press conference Friday, March 4, 2016, in Houston. Kelly set a U.S. record with his 340-day mission to the International Space Station.
NASA astronaut Scott Kelly speaks during a press conference Friday, March 4, 2016, in Houston. Kelly set a U.S. record with his 340-day mission to the International Space Station. Pat Sullivan AP
NASA astronaut Scott Kelly speaks during a press conference Friday, March 4, 2016, in Houston. Kelly set a U.S. record with his 340-day mission to the International Space Station. Pat Sullivan AP