... Dwarf Galaxies in the Coma Cluster . ... In visible light images, over a thousand galaxies are seen to lie within a volume about 20 million light-years across in the rich Coma Galaxy Cluster. But infrared images of the Coma Cluster have now been used to add thousands more to the Coma's galaxy count in the form of previously undiscovered dwarf galaxies. ... The Hubble Space Telescope has resolved individual stars in a spectacular new image of nearby spiral galaxy M81. ... The Horsehead Nebula . ...