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Old Sparklers
Featured on May 12, 2015
Thousands of ancient stars sparkle in the heart of M13, one of the largest star clusters in the Milky Way galaxy. It contains perhaps 500,000 stars packed into a ball that's only a few dozen light-years across. The cluster's stars are all 10 billion years old or older. Under dark skies, M13 is just visible to the unaided eye in the constellation Hercules. [NASA/ESA/STCsI]
