The Coma Cluster of Galaxies pictured is one of the densest clusters known - it contains thousands of galaxies . Each of these galaxies house billions of stars - just like our own Milky Way Galaxy . 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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