Look up to the sky...
and gaze into a cosmic snow globe filled with more than 100,000 sparkling stars — that’s M13, the Hercules Cluster. One of the brightest globular clusters in the Northern Hemisphere, M13 lies 25,000 light-years away in the constellation Hercules, shining at magnitude 5.8 and even visible through binoculars. In 1974, the Arecibo Observatory beamed a radio message its way in an experiment to contact potential extraterrestrial life.
This is a ball of ancient stars packed so tightly together that resolving each one is a true Herculean challenge! ;-)
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