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The galaxy cluster Abell 959

An optical image of the cluster of galaxies Abell 959. Radio images of this cluster identify several giant structures produced by hot gas, consistent with excitation by extensive shocks. Credit: ALFOSCCCD camera at the 2.56-m NordicOptical Telescope on La Palma HkonDahle, RagnvaldIrgens and Per B.Lilje, with some additional contributions from Gerbs Bauer,Doug Clowe and Henning Holen