Abell 2151 is a massive galaxy cluster located in the constellation Hercules. It is part of a larger structure known as the Hercules Supercluster and contains numerous galaxies, hot gas, and dark matter. The cluster is approximately 500 million light-years away from Earth and is one of the largest known clusters in the universe. The cluster is notable for its rich population of galaxies, including many that are elliptical in shape. Abell 2151 is also a site of significant astronomical research, as it provides insights into the formation and evolution of galaxy clusters and the large-scale structure of the universe.