Astronauts stranded in space due to multiple issues with Boeing's Starliner — and the window for a return flight is closing

An artist's rendition shows Boeing's CST-100 Starliner heading for a rendezvous with the International Space Station.

Editor's note: NASA announced on Friday that Starliner's troubleshooting has been extended for a third time, meaning that the astronauts will stay aboard the International Space Station indefinitely until some time in July.

Two NASA astronauts who rode to orbit on Boeing's Starliner are currently stranded in space aboard the International Space Station (ISS) after engineers discovered numerous issues with the Boeing spacecraft. Teams on the ground are now racing to assess Starliner's status.