M3 (NGC 5272)
M3 has an age of roughly 8 billion years and contains mostly old, red stars. The existence within it of a number of young blue stars was once puzzling to astronomers, but these so-called blue stragglers are now thought to form as a result of stellar interactions.
M3 was discovered by Charles Messier in 1764, and first resolved into stars by William Herschel in about 1784.
Related categories• NEBULAE AND STAR CLUSTERS
• MESSIER CATALOGUE
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