The Crew-10 mission will send four astronauts to the space station to take over for Butch Wilmore and Suni Williams’ crew, finally allowing their return home.

When a mission known as Crew-10 launches as early as Wednesday, its arrival in orbit will allow for the crew of the Boeing Starliner to come home.

SpaceX on Wednesday scrubbed the expected launch of a replacement crew of four astronauts to the International Space Station that would have set in motion the long-awaited homecoming of two U.S. astronauts.