Two astronauts who flew to the International Space Station in June for a 10-day mission may not return until sometime next year, NASA officials said in their most recent update on the troubled Starliner mission. Here’s the latest.

The two members of the Crew Flight Test (CFT) of the Starliner mission are Barry E. “Butch” Wilmore and Sunita Williams. They are both graduates of the U.S. Naval Test Pilot School, and both have been to space twice before. Wilmore flew on Space Shuttle Atlantis to an 11-day mission at the ISS in 2009, and spent almost six months on the station in 2014-2015. Williams flew to the space station in 2007 and again in 2012, racking up almost one year in space between those two missions.

Barry Wilmore and Sunita Williams flew a Boeing Starliner to the space station for a planned 10-day mission, but complications arose.{ai:summary}<p>Two seasoned astronauts, Barry Wilmore and Sunita Williams, who ventured to the ISS in June, might be stranded in space until next year due to ongoing troubles with the Starliner mission. Their flight was meant to be a 10-day test, but plans have gone awry.  </p><p>Both have impressive backgrounds from the U.S. Naval Test Pilot School and have previously spent extensive time in orbit, now facing an unplanned extension. #science</p>

What to know about NASA's 'stranded' astronauts, due back on Earth next February

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