Herschel and Planck find missing clue to galaxy cluster formation

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By combining observations of the distant Universe made with ESA’s Herschel and Planck space observatories, cosmologists have discovered what could be the precursors of the vast clusters of galaxies that we see today.

via ESA Space Science

http://www.esa.int/Our_Activities/Space_Science/Herschel_and_Planck_find_missing_clue_to_galaxy_cluster_formation