Have we just found dark matter? Dark matter is thought to make up 85 per cent of all mass in the universe, but physicists have never been able to detect the particles that constitute it. One leading candidate for dark matter is a ghostly object called a weakly interacting massive particle (WIMP). If dark matter is distributed throughout our galaxy, as its gravitational pull suggests, and it is also made up of WIMPs, then we should see a glow from the WIMPs self-annihilating. Unexplained gamma ra