Galaxy Cluster

A galaxy cluster is a large group of galaxies that are held together by gravity. These clusters can contain hundreds or even thousands of galaxies, along with gas, dust, and dark matter. They are among the largest structures in the universe and typically span millions of light-years across. Studying galaxy clusters helps scientists understand the universe's formation and the distribution of matter, as well as phenomena like dark matter and cosmic evolution. Clusters often serve as laboratories for astrophysical research, revealing insights about the nature of galaxies and the forces that govern the cosmos.