The NASA astronaut, who just spent 340 days on the International Space Station, talks to NASA public affairs office commentator Rob Navias shortly after .
Astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko left the International Space Station Tuesday, finally landing in Kazakhstan, after nearly a year in .
Kellys year-long mission in space designed to measure the impact of space travel on his body. SUBSCRIBE to ABC NEWS: .
An American astronaut and Russian cosmonaut have returned to Earth after an unprecedented period of almost a year in space for NASA. The time spent by .
