SpaceX becomes first to re-fly used rocket

Partially recycled Falcon 9 rocket successfully launched and landed, a step toward vastly less expensive spaceflight

SpaceX launched its first "pre-flown" rocket on Thursday, marking the first time anyone has relaunched a booster into space, in what CEO Elon Musk called "a milestone in the history of space".

"This is going to be ultimately a huge revolution in spaceflight," Musk said on a SpaceX broadcast of the launch.