Watch how Elon Musk's 'most difficult launch ever' for SpaceX fared

SpaceX is launched its massive Falcon Heavy rocket for the second time this year on Monday night in an experimental mission for the U.S. Air Force. The rocket is delivering 24 spacecraft into three separate orbits, in what CEO Elon Musk called SpaceX's "most difficult launch ever." The rocket's core booster exploded in the Atlantic Ocean after trying to land on a platform, and SpaceX's high speed boat managed to catch the nosecone with a net as the reusable rocket part came back down to Earth.