PIX4564635: Globular cluster M13 - Hercules cluster - The Great Globular Cluster in Hercules M13 - M13 (NGC6205), extends for about 150 years - light and is 22,000 years - light from Earth in the constellation of Hercules. M13 (NGC 6205) in the Hercules constellation has a diameter of about 150 light - years and is 22,000 light - years away from Earth / Bridgeman Images