The Hercules cluster offers clues about galaxy interactions
[CLICK ON IMAGE FOR HIGH RESOLUTION, Image Credit & Copyright: Ken Crawford These are galaxies of the Hercules Cluster, an archipelago of island universes a mere 500 million light-years away. Also known as Abell 2151, this cluster is loaded with gas and dust rich, star-forming spiral galaxies but has relatively few elliptical galaxies, which lack […]