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A supercomputer simulation of a collision between two galaxy clusters, if dark matter consisted of extremely strongly 'self-interacting’ particles that feel large forces in addition to gravity. The resulting distribution of dark matter and gas disagrees with what is observed in the real Universe - indeed, the interaction is so strong in this case that the dark matter stopped close to the point of impact. Since this is not seen in the real Universe, this enables us to rule out this particular model of dark matter.
Credit: Andrew Robertson / Institute for Computational Cosmology / Durham University
