The Great Hercules Cluster (M13) is a globular cluster about 22,000 light-years away, holding several hundred thousand stars packed into a sphere roughly 150 light-years across.
Edmond Halley discovered M13 in 1714, and it is one of the finest globular clusters of the northern sky, just visible to the naked eye under dark skies. Its stars are more than 11 billion years old, among the oldest in the galaxy. In 1974 the Arecibo radio message was beamed towards it, a symbolic greeting to a distant city of stars.
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The Great Hercules Cluster (M13)
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