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The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies.〔 〕〔(【引用サイトリンク】 url = http://imagine.gsfc.nasa.gov/docs/features/objects/coma.html )〕 Along with the Leo Cluster (Abell 1367), it is one of the two major clusters comprising the Coma Supercluster. It is located in and takes its name from the constellation Coma Berenices. The cluster's mean distance from Earth is 99 Mpc (321 million light years).〔〔(【引用サイトリンク】publisher=Infrared Processing and Analysis Center )〕 Its ten brightest spiral galaxies have apparent magnitudes of 12–14 that are observable with amateur telescopes larger than 20 cm. The central region is dominated by two supergiant elliptical galaxies: NGC 4874 and NGC 4889. The cluster is within a few degrees of the north galactic pole on the sky. Most of the galaxies that inhabit the central portion of the Coma Cluster are ellipticals. Both dwarf and giant ellipticals are found in abundance in the Coma Cluster.〔(Newswise: Hubble's Sweeping View of the Coma Cluster of Galaxies ) Retrieved on June 11, 2008.〕 ==Cluster members== As is usual for clusters of this richness, the galaxies are overwhelmingly elliptical and S0 galaxies, with only a few spirals of younger age, and many of them probably near the outskirts of the cluster. The full extent of the cluster was not understood until it was more thoroughly studied in the 1950s by astronomers at Mount Palomar Observatory, although many of the individual galaxies in the cluster had been identified previously. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Coma Cluster」の詳細全文を読む スポンサード リンク
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