HST Photographs a Cluster of Galaxies Four Billion Light-years Away

This is a NASA/ESA 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.

The Space Telescope pictures are sharp enough to distinguish between various forms of spiral galaxies, as well as galaxies in collision, some tearing material from each other, some merging into single systems.


Alan Dressier, Carnegie Institution, and NASA/ESA Co-investigators: Augustus Oemler (Yale Universfty), James E. Gunn (Princeton University), Harvey Butcher (the Netherlands Foundation for Research in Astronomy).

About the Image

NASA press release
NASA caption
Release date:1 December 1992, 06:00
Size:2367 x 2358 px

About the Object

Name:CL 0939+4713
Type:• Early Universe : Galaxy : Grouping : Cluster
Distance:z=0.406 (redshift)
Constellation:Ursa Major

Image Formats

Large JPEG
1.6 MB
Screensize JPEG
237.2 KB


Position (RA):9 43 6.53
Position (Dec):46° 59' 13.77"
Field of view:1.32 x 1.32 arcminutes
Orientation:North is 2.9° right of vertical

Colours & filters

720 nm Hubble Space Telescope

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