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

Just over a day after blasting off, a SpaceX crew capsule arrived at the International Space Station on Sunday, delivering the replacements for NASA’s two stuck astronauts. The four newcomers—representing the U.

Butch Wilmore and Suni Williams need SpaceX to get a relief team to the space station before they can check out. Arrival is set for late Saturday night.

Just over a day after blasting off, a SpaceX crew capsule arrived at the International Space Station on Sunday, delivering the replacements for NASA’s two stuck astronauts, the Associated Press reported.