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Hi Allan,
I think it better to just use the Wikipedia definition,
"A nebula (Latin for "cloud";[2] pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases."
Otherwise, nebula like any emission nebula, planetary nebula or supernova nebula found in another galaxy, would have to have new names - for no apparent reason.
Regards,
Renato
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