More Stars Than You Can Count
The Coma Cluster of Galaxies, one of the densest known galaxy collections in the universe. Spanning several million light-years across the entire cluster contains thousands of galaxies. The cluster has a spherical shape more than 20 million light-years in diameter.
It is named after the constellation Coma Berenices, Bernice's Hair, which is near the Milky Way's north pole. This places the Coma Cluster in an area unobscured by dust and gas from the plane of the Milky Way, and easily visible from Earth. Most of the galaxies that inhabit the central portion of the Coma Cluster are ellipticals. Both dwarf, as well as giant ellipticals are found in abundance in the Coma Cluster.
Farther out from the center of the cluster are several spiral galaxies. These galaxies have clouds of cold gas that are giving birth to new stars. Spiral arms and dust lanes "accessorize" these bright bluish-white galaxies that show a distinctive disk structure.
In between the ellipticals and spirals is a morphological class of objects known as S0 (S-zero) galaxies. They are made up of older stars and show little evidence of recent star formation, however, they do show some semblence of structure—perhaps a bar or a ring, which may give rise to a more disk-like feature.
This Hubble image consists of a section of the cluster that is roughly one-third of the way out from the center of the cluster.
In the entire Coma Cluster, there are more stars in all its galaxies than there are grains of sand on all the beaches in all the world.