Four SpaceX astronauts blasted off in a SpaceX Falcon 9 rocket Friday afternoon to the International Space Station to rescue two stuck NASA astronauts.

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.