NASA's Peggy Whitson recently completed her third mission, and along with a total of 665 days in space -- the longest duration for an American astronaut -- created many other records. The first female International Space Station commander, Whitson completed a 288-day mission that began last November and spanned 122.2 million miles and 4,623 orbits of the Earth -- her third long-duration mission on the station. At the age of 57, Whitson is also the oldest female astronaut in the history of space exploration.