Galaxy Cluster

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© ESO.

The bright, extended objects in this image are galaxies in the cluster ACO 3341. This cluster, located almost 500-million light years from the Milky Way, contains numerous galaxies of different sizes, shapes, and luminosities that are bound together by the force of gravity. The cluster is also believed to contain far more dark matter than luminous matter, which accounts for the relative motion of all the galaxies. (Unit: 10)