The return mission for two astronauts stuck in space has been hit with another delay, NASA said Wednesday, as a joint operation with SpaceX was canceled.

NASA and SpaceX delayed a mission to the International Space Station that would have brought back stranded Boeing astronauts Suni Williams and Butch Wilmore.

NASA and SpaceX on Wednesday delayed the launch of a replacement crew of four astronauts to the International Space Station that would have set in motion the long-awaited homecoming of U.S. astronauts Butch Wilmore and Suni Williams.