Scott Kelly, a retired U.S. astronaut, spent 520 days in space over four missions. Working in outer space is a lot like working on earth, but with different challenges and in closer quarters.

Astronaut Scott Kelly tells the BBC how he managed to live for a year on the International Space Station and why, four years into his retirement from Nasa, he would go back if someone asked. It's ...

Here’s how it works. Twin astronauts Scott and Mark Kelly pose at Johnson Space Center in Houston on Jan. 19, 2015, before Scott Kelly's nearly yearlong stay on the International Space Station.

NASA astronaut Scott Kelly goes to space for nearly a year, comes back, and suddenly has turned into a mutant with different DNA from his twin. As Newsweek wrote, his DNA “changed in space.” ...

Former NASA astronaut Scott Kelly knows a thing or two about isolation. In 2016, Kelly became the first American to spend 12 consecutive months in space when he completed a 340-day stint on the ...

Scott Kelly left a copy of "Endurance" on the International Space Station. The veteran of the single longest mission by an American astronaut, Kelly recounts his 340 days on board the station in ...

Scott Kelly was in Toronto for a sit-down with Canadian astronaut Dr. Dave Williams at the Ontario Science Centre to talk about his time in space, what sparked his dream, and what's next for ...

Former NASA astronaut Scott Kelly uses the power of Twitter to answer some common questions about astronauts. How fast is the international space station? Can you see the eclipse from space? Scott ...

If NASA had allowed it, astronaut Scott Kelly would have loved to climb out of the Soyuz capsule after landing on Tuesday and walked on his own, Kelly’s brother, Mark, said during a news ...