Who are the NASA astronauts who have been stuck in space for nine months?

NASA astronauts Butch Wilmore (L) and Suni Williams - (AFP via Getty Images)

Stranded in space for months longer than planned, astronauts Butch Wilmore and Suni Williams have become unlikely household names.

Their unexpected extended stay aboard the International Space Station (ISS) began with a seemingly routine test flight of Boeing's Starliner capsule last June.