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.

Mark and Scott Kelly, brothers was are both veterans of four spaceflights, join CBS Mornings to discuss today's SpaceX ...

Before Mark Kelly emerged as one of the lead contenders for VP on the Democratic ticket, the former astronaut earned more than a million dollars on the speaking circuit.

Kelly and his brother, Scott Kelly, are retired NASA astronauts, while Musk is the founder of the Texas-based space technology company SpaceX.

NASA is testing the effects of long duration in space travel on the human body for a future mission to Mars, and Kelly came with a huge bonus - an identical twin, astronaut Mark Kelly, who could ...

Mark Kelly can look to a notable precedent in astronaut-politicians: John Glenn. Glenn became the first American to orbit the Earth in 1962. He won an Ohio Senate seat in 1974 and served until 1999.

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.

June 21, 2011 / 12:16 PM EDT / CBS/AP Astronaut Mark Kelly says he is retiring from NASA and the U.S. Navy to be with his wife, Rep. Gabrielle, as she continues her long recovery from a gunshot wound.