Galaxy cluster
Structure made up of a gravitationally-bound aggregation of hundreds of galaxies; is larger than a galaxy group
Nº Q204107 ★★
Uncommon · Knowledge
Galaxy cluster
Structure made up of a gravitationally-bound aggregation of hundreds of galaxies; is larger than a galaxy group
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.
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From Wikipedia
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. They are the biggest known gravitationally bound structures in the universe. They were believed to be the largest known structures in the universe until the 1980s, when superclusters were discovered. Small aggregates of galaxies are referred to as galaxy groups rather than clusters of galaxies. Together, galaxy groups and clusters form superclusters.
Text: Wikipédia, CC BY-SA 4.0. · Image: NASA, ESA, and M. Brodwin (University of Missouri) (CC BY 4.0) ·
