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Abell 370
Abell 370 is a galaxy cluster located approximately 6 billion light-years away from the Earth (at redshift ''z'' = 0.375), in the constellation Cetus. Its core is made up of several hundred galaxies. It was catalogued by George Abell, and is the most distant of the clusters he catalogued.
==Gravitational lensing==
Abell 370 appears to include several arcs of light, which in fact are mirages caused by gravitational lensing of more distant objects.〔''New York Times'', ("SCIENCE WATCH; Mirages in the Sky May Not Be So Rare" ) Tuesday, October 18, 1988〕
In 2002, astronomers used this lensing effect to discover a galaxy, HCM-6A, 12.8 billion light years away from Earth. At the time it was the furthest known galaxy.〔BBC News, ("Far away stars light early cosmos" ) Thursday, 14 March 2002, 11:38 GMT〕
In 2009, study in the field of Abell 370 revealed a grouping of background galaxies lensed and distorted by the cluster into an arc with the appearance of a dragon, hence nicknamed The Dragon〔Astronomy Now, ("Refurbished Hubble gets off to a flying start" ) 09-09-09 (accessed 2009-11-07)〕 by NASA scientists.〔New York Times, ("The Universe, in High Definition" ) 09/09/09 (accessed 2009-11-07)〕 Its head is composed of a spiral galaxy,〔''New Scientist'', ("Upgraded Hubble telescope spies cosmic 'dragon' " ) 09.09.09 (accessed 2009-11-07)〕 with another spiral composing the tail. Several other galaxies form the body of the dragon, all overlapping.〔National Geographic, ("NEW HUBBLE PICTURES: First Shots From Upgraded Orbiter" ) Saturday, November 7, 2009 (accessed 2009-11-07)〕 These galaxies all lie approximately 5 billion light years away.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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