The Coma Cluster of Galaxies pictured above 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. 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 .
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