NASA makes us proud to be Americans. And even more so, the agency is an engine of discovery and innovation that benefits all ...

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

Kelly laments the death of astronaut Jim Lovell and a U.S. disinvestment from science while sidestepping White House talk.

Thus, NASA said that human health can likely be "mostly sustained" for a year in space, and bodes well for even longer treks to Mars. From 2015 to 2016, Scott Kelly became the first American ...

Identical twins Mark Kelly, left, and brother Scott, right, are veterans of multiple spaceflights. Scott Kelly lived aboard the International Space Station for 340 days in 2015-16. NASA ...

Mark Kelly's four years in the Senate came after a career in the military, at NASA and on front lines of advocacy for gun ...

Could NASA see similar influence again if presumptive Democratic nominee Vice President Kamala Harris chooses Sen. Mark Kelly of Arizona to be her running mate, and the duo wins election in ...

Kelly says his twin brother, Scott Kelly, who just returned to Earth after 340 days in space, was temporarily 2 inches taller. NASA is studying the pair to explore what spaceflight does to the body.

Kelly has an identical twin, Scott Kelly, who was also a NASA astronaut. From 2015 to 2016, Scott spent nearly a year aboard the International Space Station, while Mark stayed on the ground.

Mark and Scott Kelly are the only twins that have ever traveled to space — and their experience will be invaluable if we want to get to Mars one day. The brothers are taking part in what NASA ...

But Kelly won’t be alone. He’ll be joined by his identical twin, retired NASA astronaut Mark Kelly. The pair have been participating in what might be the most far-out twin study ever conducted.

June 21, 2011 -- Mark Kelly, the astronaut husband of Rep. Gabrielle Giffords, announced today he is retiring from NASA to spend time with his wife and write a memoir with her.