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NASA Astronomy Picture of the Day

🌌 NASA Astronomy Picture of the Day

A Distant Cluster of Galaxies

Date: 1997-12-07

A Distant Cluster of Galaxies

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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.