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NASA astronaut Mike Hopkins in a spacesuit outside the International Space Station on Dec. 24, 2013.

NASA astronaut Peggy Whitson has spent more days in space than any other American — here’s how much time US astronauts have logged in spac...

American astronauts have racked up an impressive amount of time in zero gravity. Here are the top 15 record-holding US astronauts.
Mark Kelly, now a retired astronaut and US Senate candidate, before NASA's penultimate space shuttle mission in May 2011.

Trump just got a step closer to creating a US Space Force. Mark Kelly, a retired NASA astronaut and Senate hopeful, has said it’s ‘a dumb ...

President Trump signed a directive to help make a US Space Force. Mark Kelly, a Senate candidate and former NASA astronaut, has called it a dumb idea.
Newly-announced US Senate candidate Mark Kelly

Former astronaut Mark Kelly announces he’s running for John McCain’s Senate seat in an emotional ad featuring his wife Gabby Giffords

Retired astronaut Mark Kelly announced his bid for former Sen. John McCain's Arizona seat on Tuesday morning with a digital campaign ad.
NASA astronaut Scott Kelly's year in space changed him.

NASA astronaut Scott Kelly shared what it was REALLY like to live in space for a year

Astronaut Scott Kelly shared some of the strangest, most interesting details about floating around the International Space Station for a year.
Retired NASA astronaut Scott Kelly said that spending time looking at planet Earth from the International Space Station changed his perspective on humanity.

NASA astronaut Scott Kelly on his poor grades in school, his biggest fear when he’s away from Earth, and how SpaceX fits into the future of inte...

Scott Kelly, retired NASA astronaut, talks about growing up with his identical twin and fellow former astronaut Mark, and his record-breaking year-long mission.

NASA sent Scott Kelly to space for a year, and 7% of his genes are now expressed differently than those of his identical twin Mark

Scott Kelly and Mark Kelly are part of a NASA Twin Study designed to learn about how spending a year in space impacts gene expression.