Hubble Images M3, One of the Milky Way's Most Massive Star Clusters

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NASA's Hubble Space Telescope has captured a detailed image of Messier 3 (M3), one of the largest and most massive globular clusters in the Milky Way galaxy. Globular clusters are dense, spherical groupings of stars held together by gravity. The stars within these clusters are ancient, having formed around the same time from the same gas cloud, making them roughly the same age. Approximately 150 globular clusters are known to exist within the Milky Way.

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