NASA astronauts Barry Wilmore and Sunita Williams have been stuck in space for nine months, on what was originally going to be an eight-day mission.

NASA and SpaceX made another attempt on Friday to send a crew up to the International Space Station (ISS) and begin the return of a pair of astronauts.

A SpaceX capsule delivered four astronauts to the International Space Station early on Sunday to allow a pair of stuck NASA astronauts to return home.