After some uncertainty and a few delays, the SpaceX mission to send a relief crew for the space station's current astronauts is set to lift off later this evening (March 14). A SpaceX Falcon 9 rocket is poised to launch the Crew-10 mission for NASA,

A decision to bring Wilmore and Williams home early aboard the Crew 9 ship ahead of Crew 10’s arrival would have left NASA astronaut Don Pettit, who flew to the ISS with a Russian crew last September, as the only American aboard the station, a rare staffing imbalance that NASA has said complicates maintenance of the station’s U.S. components.