The crew-swap mission will enable NASA’s Butch Wilmore and Suni Williams to return home from the International Space Station.

NASA and SpaceX on Friday launched a long-awaited crew to the International Space Station that will let them bring home U.S. astronauts Butch Wilmore and Suni Williams, who have been stuck on the orbital lab for nine months.

The replacements for NASA’s two stuck astronauts launched to the International Space Station on Friday night, paving the way for the pair’s return after nine long months. Butch Wilmore and Suni Williams need SpaceX to get this relief team to the space station before they can check out.