Bautz-Morgan type
Poor galaxy clusters
Virgo Cluster
Abell clusters
Galactic and extragalactic astronomy
Superclusters
High-redshift galaxy clusters
Perseus Cluster
Intracluster medium
Rich galaxy clusters
Coma Cluster
Galaxy clusters
Galaxy clustering
Groups of galaxies
Cluster of galaxies
An aggregation of galaxies, made up of a few to a few thousand members, which may or may not be held together by its own gravity.