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Originally Posted by magnus3000
Doesn’t the dark matter theory also predict that there should exist galaxies devoid of dark matter? I mean, if u look at the famous picture of the bullet cluster, u see the heated gas separated from dark matter. Won’t that gas eventually cool down and form its own stars and galaxies, without dark matter? What kind of galaxies will be the result of that? Are people looking for such galaxies?
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The Bullet Cluster's unusual dark matter distribution was discovered relatively recently. I expect that there are people who are looking to see the relative proportions of reactive matter and dark matter in various galaxies, but this is not an easy measurement to make for any but the closest of galaxies. Also, the cluster collision that the Bullet cluster experienced may be a fairly rare occurrence so we don't know how many such galaxies would be out there. One more thing. The collision of the two clusters is not a simple two body problem. It is very likely that the dark matter is separated from the central gas for now, but it may be coming back in some configuration or another.