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Galaxy cluster
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== Cluster formation and evolution == As galaxy clusters form, massive amounts of energy are released due to shock waves, the heating of gas, and galaxy interactions.<ref name="Kravtsov2012" /> Gas collides with existing material which generates shock waves, heating it to tens of millions of degrees and producing X-ray emissions. Galaxy evolution within the cluster is governed by interactions between galaxies, such as [[Galaxy merger|galaxy mergers]], and gas stripping.
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