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#Mon Aug 09 11:42:17 CEST 2010
Slide__ZLg4kKOaEd-WfYQ0GneCwQ_title=How Massive is a Galaxy Cluster ?
Slide__ZLg4kKOaEd-WfYQ0GneCwQ_subTitle=
Slide__ZLg4kKOaEd-WfYQ0GneCwQ_footer=Source\: NASA/STScl, 1995