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Hubble Finds Dark Matter Ring in Galaxy Cluster

Hubble Finds Dark Matter Ring in Galaxy Cluster
This Hubble Space Telescope composite image shows a ghostly "ring" of dark matter in the galaxy cluster Cl 0024+17. (Image credit: NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University))

This Hubble Space Telescope composite image shows a ghostly "ring" of dark matter in the galaxy cluster Cl 0024+17.The ring-like structure is evident in the blue map of the cluster's dark matter distribution. The map is superimposed on a Hubble image of the cluster. The ring is one of the strongest pieces of evidence to date for the existence of dark matter, an unknown substance that pervades the universe.

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