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#Mon Aug 09 11:42:17 CEST 2010
Text__ZLuT8KOaEd-WfYQ0GneCwQ_title=How Massive is a Galaxy Cluster ?
Text__ZLuT8KOaEd-WfYQ0GneCwQ_text=The galaxy cluster Abell 2218 (here an image taken from the space telescope Hubble) is two billion light years away. It consists of roughly thousand galaxies.