Coma Cluster

The Coma cluster is the prototypical rich cluster of galaxies, with over a thousand member galaxies known. This is the central region, dominated by two giant ellipticals. As is usual for clusters of this richness, the galaxies are overwhelmingly elliptical and S0 galaxies, with only a few spirals (and many of them probably near the outskirts of the cluster). Most of the objects in this picture are galaxies; only the very bright objects with diffraction spikes and the smallest circular dots are foreground stars in our Galaxy. This blue-light image was provided by Gregory Bothun (University of Oregon). The color shades represent different brightness levels, to make subtle detail more obvious.

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