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#Mon Aug 09 11:42:17 CEST 2010
Slide__ZMGucKOaEd-WfYQ0GneCwQ_title=How Massive is a Galaxy Cluster ?
Slide__ZMGucKOaEd-WfYQ0GneCwQ_subTitle=
Slide__ZMGucKOaEd-WfYQ0GneCwQ_footer=<p><p></p></p>Galaxy Cluster Abell 2218, Exposure by Hubble-Telescope<p>Source\: NASA/STScl, 1995</p>