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A comment on New class of galaxy has been discovered, made almost entirely of dark matter. Parent comment

Re:New class of galaxy has been discovered, made almost enti... by the8472 on Friday August 26, 2016 @03:59PM (#12368905)
It's more localized, but we've seen similar things before at a larger scale, e.g. the bullet cluster.

https://en.wikipedia.org/wiki/Bullet_Cluster

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