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Abell 2744, nicknamed Pandora's Cluster, is a giant galaxy cluster resulting from the simultaneous pile-up of at least four separate, smaller galaxy clusters that took place over a span of 350 million years.〔 The galaxies in the cluster make up less than five percent of its mass.〔 The gas (around 20 percent) is so hot that it shines only in X-rays.〔 Dark matter makes up around 75 percent of the cluster's mass.〔 This cluster also shows a radio halo along with several other Abell clusters. It has a strong central halo, along with an extended tail, which could either be relic radiation, or an extension of the central halo. “We nicknamed it ‘''Pandora's Cluster''’ because so many different and strange phenomena were unleashed by the collision.”〔Renato Dupke quoted at (Pandora's Cluster - a galactic crash investigation ) Press release of 22 June 2011〕 ==Gallery== File:Hubble sees ghost light from dead galaxies in galaxy cluster Abell 2744.jpg|The galaxies that are not coloured blue are either in the foreground or background and are not part of the cluster. File:Heic1401a-Abell2744-20140107.jpg|Abell 2744 galaxy cluster - Hubble Frontier Fields view (7 January 2014). File:14-283-Abell2744-DistantGalaxies-20141016.jpg|Abell 2744 galaxy cluster - extremely distant galaxies revealed by gravitational lensing (16 October 2014). 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 2744」の詳細全文を読む スポンサード リンク
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