Butch Wilmore and Suni Williams need SpaceX to get this relief team to the space station before they can check out.

By Joey RouletteWASHINGTON (Reuters) - NASA and SpaceX on Friday launched a long-awaited crew to the International Space Station that opens the door to bringing home U.S. astronauts Butch Wilmore and Suni Williams,

After their flight was scrubbed on Wednesday, four astronauts successfully lifted off, which will allow two NASA astronauts to return to Earth after an unexpected extended stay in orbit.