Wednesday, March 27, 2024

APOD - The Coma Cluster of Galaxies

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.

2024 March 27
A picture filled with fuzzy yellow spots is presented.  All of the yellow spots are galaxies, and most of the   galaxies are members of the Coma Cluster of Galaxies.  The two bright blue dots are foreground stars in our own  Milky Way Galaxy.  Please see the explanation for more detailed information.

The Coma Cluster of Galaxies
Image Credit & Copyright: Joe Hua

Explanation: Almost every object in the featured photograph is a galaxy. The Coma Cluster of Galaxies pictured here is one of the densest clusters known - it contains thousands of galaxies. Each of these galaxies houses billions of stars - just as our own Milky Way Galaxy does. Although nearby when compared to most other clusters, light from the Coma Cluster still takes hundreds of millions of years to reach us. In fact, the Coma Cluster is so big it takes light millions of years just to go from one side to the other. Most galaxies in Coma and other clusters are ellipticals, while most galaxies outside of clusters are spirals. The nature of Coma's X-ray emission is still being investigated.

Tomorrow's picture: millions of stars


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