Because SpaceX’s next crew rotation mission to the International Space Station will use a new Dragon spacecraft that won’t be ready by a previously planned February launch date, NASA announced Tuesday that it has opted to delay the launch now until no earlier than late March.

The crew launched to the ISS in June for a week-long mission but will end up spending an unplanned nine months in space.

NASA astronauts Sunita "Suni" Williams and Barry "Butch" Wilmore have reached their six-month milestone of being stranded on the International Space Station, despite initially planning to stay for just eight days.

Learn how NASA astronauts Suni Williams and Butch Wilmore got stuck on the International Space Station, and why their return to Earth has been delayed again.

The two NASA astronauts "not stranded" on the International Space Station (ISS) are "not stranded" for another month. Due to a delay in the next crew rotation mission, Butch Wilmore and Suni Williams will remain on the station until late March.

The return of NASA astronauts Sunita Williams and Barry Wilmore from the International Space Station has been delayed again, extending their mission to over nine months. Doctors are concerned about the impact of prolonged stays in space on their health.