I'm talking about Peggy Whitson, biochemistry researcher, NASA astronaut, and former NASA Chief Astronaut. She was the first woman to command the International Space Station when she arrived as part of Expedition 16, on October 10, 2007. After her two trips to space, she's NASA's most experienced female astronaut, with more than 376 days in space. And she's going back again in November 2016 as part of Expedition 50/51. At 56, she will be the oldest woman to travel in space.