Elon Musk's SpaceX has blasted the most powerful rocket on Earth into space. The rocket is now easily the most powerful on the planet. And what's more, it managed to come back down to Earth, with each of the three stages landing in different places, ready to be re-used. Eventually, SpaceX hopes that a version of the same rocket can be used to carry humans to the moon, and perhaps even to Mars. The Falcon Heavy took off from the same Cape Canaveral launchpad that took people to the moon nearly 50 years ago, and is the most powerful rocket seen on Earth since the one that carried them there.