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Unformatted text preview: they have grown very large from pulling in galaxies that were unfortunate to have strayed too close to escape the giant ellipticals' gravity. Other rich clusters show the same segregation of the spirals from the ellipticals as the Coma Cluster. Ellipticals gather together in the center of clusters while spirals prefer to stay close to the periphery. The Coma cluster is a rich galaxy cluster with thousands of galaxies. Courtesy of NOAO/AURA/NSF The Hercules cluster is a poor cluster with less than a hundred galaxies. Courtesy of NOAO/AURA/NSF...
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