The Coma Cluster isn't just a collection of stars, it's a collection of galaxies; each with billions of stars inside it. The Coma Cluster is one of the densest know clusters, containing 1,000's of galaxies. Light from the Coma Cluster takes 100s of millions of years to get to Earth -the Coma Cluster is so big that for light to even get from one side to the other it would take millions of years. This 2006 image by the Hubble Space Telescope is just a small portion of Coma. Most of Coma's galaxies are elliptical, but there are also plenty that are spiral. Astronomers took interest into the Coma Cluster to investigate how galaxies in rich clusters form and evolve.
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