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The Coma Cluster (Abell 1656)

The Coma Cluster is a large cluster of galaxies that contains over 1000 identified galaxies, whose mean distance from Earth is 321 million light years. While observing the movement of galaxies in this cluster in 1933, Fritz Zwicky coined the term 'dark matter', since they were moving too fast for the cluster to be bound together only by the visible matter.