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NGC 6559 is a star-forming region located at a distance of about 5000 light-years from Earth, in the constellation of Sagittarius, showing both emission (red) and reflection (bluish) regions. NGC 6559 is relatively small at only a few lightyears across. The nebula is found within Sharpless 29, an irregular H II region.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).