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Astronomers detected the dark matter because it separated from the normal matter during the cosmic smash-up.The research team are to publish their findings in the Astrophysical Journal.They used the Hubble and Chandra space telescopes to study the object MACSJ0025.4-1222 - formed after an incredibly energetic collision between two large galaxy clusters.
[...]There are a couple of reasons why this hasn't happened. Our solar system has only come into contact with very negligible quantities of dark matter. Dark matter has an exceptionally high minimum volume compared with regular matter and cannot clump around astronomical bodies, causing a noticeable effect.
That was not a collision between two galaxies it was a collision between two clusters of galaxies. The evidence for dark matter is extremely compelling from galaxy rotations gravitational lensing and the cluster collision.
I expect that when things are worked out there may well be several different types of particles may be involved including the supersymmetric ones.