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Definition of White nebula
1. Noun. (astronomy obsolete) a nebula that appears white in colouration through a high-powered telescope (gloss nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of White Nebula
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