The new twist comes after the Falcon 9's first stage finishes its main job. Three minutes after launch, the second stage is due to separate and fire up its own rocket engine to continue the trip. Then the first stage is slated to relight its rocket engines and go through a complex series of maneuvers to put itself safely down on a 300-foot-long, 170-foot-wide (91-by-52-meter) "autonomous spaceport drone ship" in the Atlantic Ocean - NBC News.com
