A SpaceX Falcon Heavy rocket ready for liftoff. Paul Hennessy/NurPhoto via Getty Images SpaceX is scheduled to launch a Falcon Heavy, the world’s most powerful reusable rocket, on Jan.

Watch how the atmospheric re-entry of one of SpaceX's Falcon Heavy's fairings, reported to be traveling at more than 15 times the speed of sound. Credit: SpaceX | Mash mix by Space.com's Steve ...