The United States most experienced space flyer is retiring.

Astronaut Peggy Whitson has spent more time in space than any other American astronaut. On Friday the 58 year old Whitson made it official, her last mission was her last mission.

She flew three missions to the international space station. The first was in 2002 aboard Expedition 5...in 2008 aboard Expedition 16 she became the first female commander on the ISS and from November 2016 through September 2017 she became the first woman to command and ISS mission twice.

On space.com they tell us that Whitson's career racked up a total of 665 days in space, more than any other NASA astronaut, and a record for women worldwide.

Whitson has also performed more space walks than any other woman raking up 60 hours and 21 minutes during 10 different walks.