The massive Coma cluster of galaxies glows in this spectacular skywatching photo.
Located 321 million light-years from Earth in the constellation Coma Berenices, this gigantic cluster comprises more than 1,000 identified galaxies. A light year A light-year is the distance light travels in one year, or about 6 trillion miles (10 trillion kilometers).
Abell 1656 is one of two major clusters that make up the Coma supercluster. The cluster has several very bright galaxies. The central area of the cluster has NGC 4874 and NGC 4889, two large elliptical galaxies. Like most clusters, this one produces large amounts of dark matter and hot X-ray emitting gas.
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