Boeing's troubled Starliner capsule that left two NASA astronauts on the International Space Station last year may need to fly a third uncrewed test flight before it carries astronauts again, agency officials said as the spacecraft's first crew had to return to Earth on a SpaceX capsule this week.

NASA has shared the first images of Butch Wilmore and Suni Williams following the end of their epic nine-month space mission that was meant to last eight days.