A Distant Cluster of Galaxies
Every bright object in this 1994 photograph by the Hubble Space Telescope is a galaxy . Oddly - most of the objects are spiral galaxies. This rich cluster of galaxies , named CL 0939+4713 , is almost half way across the visible universe. Photos like this indicate that clusters in the past contained a higher fraction of spirals than do nearby clusters , which are usually dominated by elliptical galaxies .