Jisho

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Noun
1. nebulaAstronomy, etc. term
2. galaxyAstronomy, etc. term, Obsolete term, See also 銀河
Wikipedia definition
3. NebulaA nebula is an interstellar cloud of dust, hydrogen, helium and other ionized gases. Originally, nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy was referred to as the Andromeda Nebula before galaxies were discovered by Edwin Hubble). Nebulae are often star-forming regions, such as in the Eagle Nebula.
Read “Nebula” on English Wikipedia
Read “星雲” on Japanese Wikipedia
Read “Nebula” on DBpedia

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