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Twin brothers and former NASA astronauts Mark and Scott Kelly have each flown four missions and were part of NASA's twin ...

Use BBC.com or the new BBC App to listen to BBC podcasts, Radio 4 and the World Service outside the UK. We use cookies to ...

Use BBC.com or the new BBC App to listen to BBC podcasts, Radio 4 and the World Service outside the UK. We use cookies to ...

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 ...

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 ...

Kelly knows that duty on the space station can mean fixing the toilet one week and being out on a spacewalk the next week. Scott, 51, and his twin brother, retired astronaut Mark, will both be ...

On Tuesday, Scott J. Kelly is scheduled to return from the International Space Station, completing the longest stay in space for a NASA astronaut. Here are some ways to measure his mission.

Bones and muscles For almost a year, Scott Kelly did not have to use his legs to walk, but instead floated to different areas of the space station. In the past, astronauts would leave space with ...

Scott’s twin Mark Kelly, who retired from the astronaut corps in 2011 and kept his feet firmly planted on the ground during his brother’s latest flight, is also undergoing many of the same tests.

Kelly returned from the International Space Station on Wednesday, ending a 340-day mission that set a U.S. record. It took him a full day to get back home from the landing site in Kazakhstan to ...