NASA astronauts Barry Wilmore and Sunita Williams have been stuck in space for nine months, on what was originally going to be an eight-day mission.

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.