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

A SpaceX crew capsule docked at the ISS on Sunday, delivering replacements for two NASA astronauts stranded in space since last June. The four newcomers from the U.S., Japan, and Russia will take over,

After more than nine months on the International Space Station, two astronauts are a step closer to returning home following the launch of a crew swap mission on Friday.