| 单词 | great cluster in hercules |
| 释义 | Great Cluster in HerculesGreat Cluster in Hercules(M13; NGC 6205) The finest globular cluster to be seen from the northern hemisphere, discovered in Hercules by Edmund Halley in 1714. It has a dense broad center that is just visible to the naked eye; a 7.5-cm telescope will show some of the outer stars. |
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