SpaceX/Flickr SpaceX is preparing to launch Falcon Heavy, its most powerful rocket to date. On Tuesday, the 23-story-high system was sitting upright, ready to go at Launch Complex 39A in Florida, the same platform where the Apollo astronauts took off for the moon decades ago. This is the first time Elon Musk's private space company has tried to launch a rocket quite this big. Falcon Heavy is re-usable, expandable, and cheaper than the competition — if it works.