NASA and SpaceX on Wednesday night scrubbed the Falcon 9 launch of a flight intended to retrieve from the International Space Station astronauts Suni Williams and Butch Wilmore, who have spent nine months in orbit.

A launch pad problem has forced a flight delay to replace NASA's two stuck astronauts. The new crew needs to get to the International Space Station before Butch Wilmore and Suni Williams can head home after nine months in orbit.

Sunita Williams and Barry “Butch” Wilmore, the NASA astronauts whose mission aboard the International Space Station was extended from about eight days to nine months, are finally set to come home. The return will have to wait a little longer,