M13 is one of the most prominent and best known globular clusters. Visible with binoculars in the constellation of Hercules, M13 is often one of the first objects that sky watchers find in their search for celestial wonders unavailable to normal human vision.
M13 is the colossal home of more than 100,000 stars that agglomerate in a sphere of about 150 light-years in diameter. It is 20,000 light-years away and is 12 billion years old.
In 1974, the Arecibo Observatory sent a radio message, with information from the Earth, to M13. The cause of the shortage of blue wandering stars in M13 is currently unknown.
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