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Groups, Clusters, and Superclusters of Galaxies

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Hubble Space Telescope deep field image of many galaxies

Galaxies are enormous, but they are not the largest structures in the Universe. We find that the galaxies themselves group into Clusters of Galaxies held together by mutual gravitational attraction, and that clusters of galaxies are themselves associated with even larger Superclusters of Galaxies. Here is an overview of such clustering, and here is another.

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