World's most experienced spacewoman retires as astronaut

NASA's record-breaking astronaut, Peggy Whitson, retired on Friday after a 22-year-long career. Whitson, who joined NASA as a researcher in 1986, has spent more time off Earth than any other American, totalling 665 days over three International Space Station missions. The 58-year-old is the oldest woman to go into space and also the most experienced female spacewalker, with 10 missions.