Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  IC 4617  ·  M 13  ·  NGC 6205
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M13 - The Great Globular Cluster in Hercules, Timothy Martin
M13 - The Great Globular Cluster in Hercules
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M13 - The Great Globular Cluster in Hercules

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M13 - The Great Globular Cluster in Hercules, Timothy Martin
M13 - The Great Globular Cluster in Hercules
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M13 - The Great Globular Cluster in Hercules

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Description

Messier 13, the Great Globular Cluster in Hercules.

M13 is about 25,000 light years away--in orbit around the Milky Way. It comprises about a half million stars. The stars in clusters like this one are generally very old--as old as 12 billion years old. But they are packed so tightly together that they sometimes collide and produce new stars, called "blue stragglers." The stars in M13 are generally "metal poor"--meaning that they don't contain much in the way of heavy elements because they haven't undergone the nucleosynthesis processes more common in stars that populate our galaxy.

One of the things I always like to see in these pictures are little bonus items tucked in somewhere in the star field. In this case, slightly above and to the right of the cluster, a spiral galaxy designated IC 4617 is hiding. Clocking in at 489 million light years away, this galaxy may be the most distant object we've ever captured on a camera.

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