Messier 3 (M3 or NGC 5272)

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A cropped version

Messier 3 (M3 or NGC 5272) is a globular cluster of stars in the northern constellation of Canes Venatici. It was discovered by Messier on May 3, 1764, and resolved into stars by William Herschel around 1784. It has an unusually large variable star population and new variable members continue to be identified up through.