The two Boeing Starliner astronauts left behind on the International Space Station are back on Earth, ending an odyssey that turned a planned eight-day trip into more than 9 1/2

That’s how long Boeing Starliner’s mission — its first flight test with crew aboard — was supposed to last. But this mission has been singular in almost every way, and astronauts Butch Wilmore and Suni Williams have instead spent the past nine and a half months aboard the International Space Station.