This week's photo is of M13: The Great Globular Cluster in Hercules. This nebula contains a mass of stars numbering in the hundreds of thousands. It is easy visible with the naked eye in the northern sky given that it is one of the star clusters in that region. The Great Globular Cluster is about 25,000 light years from Earth with a massive diameter of 150 light years. Also, located in the background is the small galaxy NGC 6207 which is of great interest to amateur astronomers because of its relative distance to M13. The Great Globular Cluster also is in Hercule's asterism, keystone.
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