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Messier Gallery![]() M13 (NGC 6205), the well-known Hercules globular cluster. With a total light about equal to a 6th magnitude star, M13 can be seen with the unaided eye in a dark sky. It is believed to be 25,000 light-years away and about 170 light-years in diameter. Return to OCA Image Gallery Index | Return to OCA Home Page
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