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A Nova Bomb (Both the UNSC of HALO version and the Imperial of Warhammer 40k version) is a very powerful weapon capable of making a sun go supernova, destroying nearly all the matter of a solar system. The weapon itself is about the size of a 55 gallon drum, and is mounted on a missile in place of a traditional explosive payload. These warheads are almost never actually kept loaded in missile tubes before they are launched in case of any technical malfunction that would cause the Nova Bombs to activate. It is part of the Exterminatus weapons in Imperial service and one of Allied Superweapons.