After spending over nine months aboard the International Space Station (ISS), NASA astronauts Butch Wilmore and Sunita Williams are preparing for their return to Earth.Director of the Space Applications Centre (SAC),

A SpaceX capsule delivered four astronauts to the International Space Station early on Sunday in a NASA crew-swap mission that will allow a pair of stuck astronauts, Butch Wilmore and Suni Williams, to return home after nine months on the orbiting lab.