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APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
A Distant Cluster of Galaxies
Explanation: In this 1994 Hubble Space Telescope photograph , every bright object is a galaxy . Oddly - most of them 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 .
| Date | December 7, 1997 |
|---|---|
| Credit | Credit: A. Dressler (CIW), NASA |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |