There are currently 2 astronomical definitions for the tag 'galaxycluster'.
galaxy cluster, cluster of galaxies, galaxy clustering
cluster of galaxies
greatattractor, sunyaevzeldovicheffect, cdgalaxy, clustering, galaxycount, galaxydistribution, galaxymerger, intergalacticmatter, intraclustermatter, luminosityfunction, luminousarc, massdistribution, massivegalaxy, missingmass, multiplegalaxy, protocluster, relaxationtime, supercluster, supergalacticcoordinatesystem, velocitydispersion, velocitydistribution, virialtheorem