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Definition of Orion nebula
1. Proper noun. (astronomy) A diffuse nebula visible in the night sky below Orion's Belt; it is approximately 40 light years across. It is one of the brightest nebulae visible to the naked eye and is the closest region of stellar formation to Earth. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Orion Nebula
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