A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, with typical masses ranging from 1014 to 1015 solar masses (M☉). Clusters consist of galaxies, heated gas, and dark matter.
A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by gravity, with typical masses ranging from 1014 to 1015 solar masses (M☉). Clusters consist of galaxies, heated gas, and dark matter.
Source: Wikipedia "Galaxy cluster" · CC BY-SA 4.0
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