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 Spaleta ...

SpaceX has launched the most powerful rocket in the world — again. This is SpaceX's Falcon Heavy. It's launching for the second time in history. But this time, its cargo is something far more ...