SpaceX Falcon Heavy rocket, the most powerful launch vehicle in the world, roared into the sky overnight for what CEO Elon Musk called the “most difficult launch” his rocket company has ever attempted. The rocket carried an eclectic batch of 24 experimental satellites into space. Getting the devices to their intended orbits was expected to take hours and require some complicated maneuvering. SpaceX’s customer for this mission, dubbed STP-2, is the US Department of Defense, a key customer that commercial companies such as SpaceX rely on for lucrative launch contracts. CNN Business video.