... ESO, the European Southern Observatory . ... ESO's Governing Bodies . ... Travel to ESO Headquarters . ... ESO Acronyms . ... Survey Telescopes . ... Galaxies . Galaxy Clusters . ... View shopping cart . ... This distant cluster of galaxies was discovered by the XXL survey. ... The distances to individual galaxies were found using ESO and other telescopes, to allow a three-dimensional view of the distribution of galaxy clusters to be determined. ... Early Universe : Galaxy : Grouping : Cluster . ...