The longest American spaceflight in history will launch in 2015

Astronauts aboard the International Space Station typically spend no more than six months in space before returning to Earth. But in spring 2015, NASA astronaut Scott Kelly will begin a yearlong sojourn aboard the orbital outpost — a voyage which, if successful, will become the longest spaceflight ever performed by an… » 11/27/12 6:40am 11/27/12 6:40am