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Deepsky Top-100 (12): M 13, the Great Globular Cluster in Hercules

Edmond Halley discovered M 13 in 1714. It is one of the finest globular clusters of the northern celestial hemisphere you can observe from your own backyard. M13 has a visual diameter of 14’ and a visual magnitude of 5.7. The cluster lies at a ..... follow this link to read the full story.

Posted by Math on 06/01 at 11:09 AM
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