Sunita Williams may be back by mid-March

Nasa's two stuck astronauts may end up back on Earth a little sooner than planned. The space agency announced Tuesday that SpaceX will switch capsules for upcoming astronaut flights in order to bring

Butch Wilmore

and Suni Williams home in

mid-March

instead of late March or April. That will shave at least a couple weeks off their prolonged stay at the International Space Station, which hit the eight-month mark last week.