Hercules globular cluster (M13), optical image. Globular clusters are groups of old stars that orbit a galaxy. They are tightly bound by gravity, givi

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Hercules globular cluster (M13), optical image. Globular clusters are groups of old stars that orbit a galaxy. They are tightly bound by gravity, giving them a spherical shape. The Hercules cluster, orbiting the Milky Way galaxy, consists of hundreds of thousands of stars and is 168 light years across. It lies around 25,100 light years from Earth in the constellation Hercules.

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Photo credit: © ROBERT GENDLER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
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Keywords: 13, astronomical, astronomy, astrophysical, astrophysics, circular, cluster, globular, great, hercules, m13, messier, object, space, spherical, star, stars, stellar, telescope