NASA and SpaceX on Friday will count down to a long-awaited crewed rocket launch that will allow them to bring home U.S. astronauts Butch Wilmore and Suni Williams, who have been stuck on the International Space Station for nine months.

The flight was scrubbed on Wednesday night, and the astronauts will return to the launchpad for their trip to the International Space Station.

NASA has scrubbed its launch to take four astronauts to the International Space Station, which is one of the first steps in returning NASA astronauts Suni Williams and Butch Wilmore’s back to Earth. NBC News' Tom Costello has more on the reasons for the scrub.