These are galaxies of the Hercules Cluster [ http://www.mistisoftware.com/astronomy/Galaxies_HerculesCluster.htm ], an archipelago of "island universes" [ http://antwrp.gsfc.nasa.gov/apod/ap020518.html ] a mere 650 million light-years distant. This cluster is loaded with gas and dust rich, star forming, spiral galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap970726.html ] but has relatively few elliptical galaxies [ http://antwrp.gsfc.nasa.gov/apod/ap961106.html ], which lack gas and dust and the associated newborn stars [ http://antwrp.gsfc.nasa.gov/apod/ap031026.html ]. Colors in the composite image show the star forming galaxies with a blue tint and ellipticals with a slightly yellowish cast. In this cosmic vista many galaxies seem to be colliding [ http://antwrp.gsfc.nasa.gov/apod/ap040612.html ] or merging [ http://www.astr.ua.edu/pairs2.html ] while others seem distorted - clear evidence that cluster galaxies [ http://www.seds.org/messier/gal_clus.html ] commonly interact. Over time, the galaxy interactions are likely to affect the the content of the cluster [ http://imagine.gsfc.nasa.gov/docs/features/topics/clusters_group/clusters_intro.html ] itself. Researchers believe that the Hercules [ http://www.astro.wisc.edu/~dolan/constellations/constellations/ Hercules.html ] Cluster [ http://crux.astr.ua.edu/white/mug/cluster/clusters.html ] is significantly similar to young galaxy clusters [ http://antwrp.gsfc.nasa.gov/apod/ap980821.html ] in the distant, early Universe and that exploring galaxy types and their interactions in nearby Hercules will help unravel the threads of galaxy [ http://www.stsci.edu/science/starburst/ ] andcluster evolution [ http://imagine.gsfc.nasa.gov/docs/features/topics/clusters_group/evolution.html ].