Galaxy Clusters Galaxy Clusters and Large-Scale Structure Groups and clusters of galaxies Galaxies are preferentially found in groups or larger agglomerations called clusters. Fornax is a small cluster of spiral and elliptical galaxies near our Local group.
Regular clusters have a concentrated central core and a well-defined spherical structure.
The Coma cluster shown here is a very rich cluster with thousands of ellipticals inside the Abell radius. The central region of the Coma cluster populated with large elliptical galaxies. This is one of the densest known regions on this scale in the universe. An example is the nearby Virgo cluster. Virgo, an irregular cluster, is the nearest large cluster of galaxies.