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Abell 1689 is a galaxy cluster in the constellation Virgo nearly 2.2 billion light years away. It is one of the biggest and most massive galaxy clusters known and acts as a gravitational lens, distorting the images of galaxies that lie behind it. It has the largest system of gravitational arcs ever found. Abell 1689 shows over 160,000 globular clusters, the largest population ever found. There is evidence of merging and gases in excess of 100 million degrees.〔 The massive gravitational nature of this system has been used to study dark matter and the effects of gravitational lensing.〔(【引用サイトリンク】url=http://adsabs.harvard.edu/abs/2014arXiv1402.4170D )〕 At the time of its discovery in 2008, one of the lensed galaxies, A1689-zD1, was the most distant galaxy found. ==Gallery== Image:Gravitationell-lins-4.jpg|Yellow galaxies belong to the cluster itself. Red and blue are background galaxies gravitationally lensed. Image:Abell 1689.jpg|Mass map of Abell 1689. Image:Globular clusters in Abell 1689.jpg|Globular clusters in Abell 1689 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「Abell 1689」の詳細全文を読む スポンサード リンク
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