SpaceX’s Crew-10 arrives at the ISS, paving the way for NASA’s Wilmore and Williams to return home.

A crew of NASA astronauts arrived at the International Space Station to replace Suni Williams and Butch Wilmore, allowing the duo to return home after a multi-day trip that turned into a politically charged nine months.

The Crew-10 mission, part of a routine personnel rotation jointly operated by NASA and SpaceX, lifted off at 7:03 p.m. ET this Friday from the Kennedy Space Center in Florida.

A SpaceX Dragon capsule, mounted on one of the company’s Falcon 9 rockets, carried the four Crew-10 astronauts: Anne McClain and Nichole Ayers of NASA; Takuya Onishi of the Japan Aerospace Exploration Agency; and Roscosmos cosmonaut Kirill Peskov.

The four crew members docked with the space station around 12:04 a.m. ET this Sunday. They will spend a few days in a “handover” period with Williams, Wilmore, and fellow Crew-9 astronauts, Nick Hague of NASA and Aleksandr Gorbunov of Roscosmos.

The Crew-9 Dragon capsule has been docked with the space station since September. If all goes according to plan, Williams, Wilmore, Hague, and Gorbunov will board the Crew-9 spacecraft and return to Earth on March 19.

NASA had scheduled the return of Williams, Wilmore, and the other Crew-9 astronauts for this Sunday. However, their departure depends on the safe arrival of the relief crew, and SpaceX canceled a Crew-10 launch attempt on Wednesday due to issues with the company’s launch pad’s ground systems.