Astronaut Peggy Whitson is already the world's most experienced spacewoman and female spacewalker and, at 57, the oldest woman in space. She now holds the record for the most accumulated time in orbit by an American.
Earlier this morning astronaut Scott Kelly arrived in Houston after nearly a year-long mission in space. The one-year mission was designed to help NASA better understand what happens to an astronaut's physical and mental health during an extremely long stay in a micro-gravity environment.