Astronomers have spotted one of the rarest and most extreme galaxy clusters in the universe and, behind it, an object that shouldn't exist.
Galaxy clusters are collections of galaxies that orbit one another and are the most massive objects in the universe. The newly discovered cluster, first detected by the Hubble space telescope, is over 500 trillion times the mass of the sun. It is located approximately 10 billion light-years away. Because looking out into the distant cosmos means also looking back in time, the cluster formed during an era when the universe was a quarter its present age.
By: Adam Mann, Edited by: Ian Steadman
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2012-06/27/galaxy-that-shouldnt-exist
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