Topline SpaceX canceled a ship launch Wednesday that is part of a mission to bring back two astronauts who have been on the International Space Station for nine months after the Boeing spacecraft they arrived in was deemed unsafe over helium leaks and thruster issues.

SpaceX's Falcon 9 rocket blasted off shortly after 1 a.m. Saturday from the Kennedy Space Center in Florida, carrying four astronauts

The two astronauts who crewed the Boeing Starliner have greeted their replacements, who arrived Saturday night at the International Space Station.

NASA astronauts Sunita Williams, Nick Hague, Barry Wilmore, and Donald Pettit unbox Thanksgiving meals, from the International Space Station (ISS), in this screen grab taken from a handout video, released on November 26,

The four newcomers — representing the U.S., Japan and Russia — will spend the next few days learning the station's ins and outs.

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.