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An artistic interpretation of a collision between galaxy clusters, with normal matter represented in orange and dark matter in blue.It's like untethered cargo during a collision between two vehicles. Other forces stop the vehicles themselves, but the cargo, under the influence of momentum, keeps going.we've seen dark matter decouple from normal matter in the course of a giant cosmic collision, but we've never seen it in quite this fashion.
But there is, somehow, more gravity out there in the cosmos than we expect there to be, based on the"normal" matter that we can detect. A lot more gravity. We observe it in the motions of stars and galaxies, and in the way space-time itself bends and warps in the presence of powerful gravitational fields.calculations, only about 15 percent of the matter budget of the Universe is normal matter.
The cluster member galaxies' speed acts as a proxy for the dark matter's speed, since galaxies and dark matter behave similarly during a cluster collision.. This is a distinct warping seen in the background light of the Universe, caused by electrons in a volume of space. Since these electrons can scatter light, this effect can be used to determine how densely the electrons are packed.
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