Mark and Scott Kelly, twin brothers and former NASA astronauts, spoke to "CBS Mornings" about how the agency is set to lose ...

Scott Kelly takes a selfie inside the International Space Station.Image: nasaThe intensive scrutiny of Kelly's body revealed a lot, but there's only compelling evidence for one human: Kelly.

After living on the International Space Station for 340 days, astronaut Scott Kelly says it was easier to spend nearly a year in space than to get used to gravity again back on Earth. Kelly is ...

Astronaut was greeted in Houston by his twin brother, Mark Kelly. — -- Astronaut Scott Kelly arrived in Houston early this morning where he was reunited with his family after a whirlwind year ...

An image posted to Astronaut Scott Kelly's Twitter account with the text "#EarthArt A single pass over the #Australian continent. Picture 11 of 17. #YearInSpace" on Oct. 12, 2015.

Astronaut Scott Kelly Back on Earth After Year in Space NASA will study how Kelly's time in space affected his body, using his twin brother, Astronaut Mark Kelly, for comparison.

Astronaut Scott Kelly said today he's excited to return to Earth to see his family but added he has enough stamina to "go another year" living in space.

-- Astronaut Scott Kelly retired today after 20 years with NASA and spending a year in space. During his career, Kelly completed four separate missions in 1999, 2007, 2010 and 2015, accruing 520 ...

After 300+ days in micro-gravity, Kelly knows one thing: "Space is hard." — -- After more than 300 days in constant micro-gravity, U.S. astronaut Scott Kelly is confident human travel to Mars ...