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Known Galaxy Clusters
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Known Galaxy Clusters

January 25, 2013
Schematic diagram of the distribution of known galaxy clusters in space. As Earth-bound observers look out from the apex of the cone, they see an increasingly more distant and earlier universe. Distance is marked on the right-hand side in units of redshift, while the corresponding cosmic look-back time is indicated on the left-hand axis. The newly discovered cluster, labelled XMMU J2235, falls in a remote regime, well beyond the horizon of previous studies (labelled ROSAT horizon). Copyright: Mullis et al.