A Cluster of Galaxies Four Billion Light-years Away
Date: 30 November 1992
Satellite: Hubble Space Telescope
Depicts: CL 0939+4713
Copyright: Alan Dressier, Carnegie Institution, and NASA Co-investigators: Augustus Oemler (Yale Universfty), James E. Gunn (Princeton University), Harvey Butcher (the Netherlands Foundation for Research in Astronomy)
This is a NASA Hubble Space Telescope image of a portion of a remote cluster of galaxies (CL 0939+4713) that existed when the universe was two-thirds of its present age (redshift z = 0.4). Hubble's high resolution allows astronomers to study, for the first time, the shapes of galaxies which existed long ago.
Last Update: 1 September 2019