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Thursday 21 June 2012
Image of the Day: Spectacular Galaxy Clusters
Image of the Day: Spectacular Galaxy Clusters: Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson Compact Groups (HCGs). With only a few member galaxies per group, HCGs are much smaller than the immense...
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