For years, physicists have tried to unravel the source of dark matter–the heavy, unseen mass of the universe without which the galaxies would lack the gravitational pull necessary to remain intact. For many, the answer was WIMPs, hypothetical “weakly interacting massive particles”–each of which could weigh up to 100 times as much as a proton. But now scientists are hypothesizing a particle some 10 billion times the mass of a WIMP: Wimpzilla, Monster of Dark Matter.