Class 11 nebula
A class 11 nebula was a type of nebula, consisting of primarily oxygen and argon with trace amounts of theta-xenon, fluorine, and sirillium. Class 17 nebulae could be superficially similar to type 11 nebulae.

The Azure Nebula was a class 11 nebula. ()

de:Klasse-11-Nebel
ja:クラス11星雲
nl:Klasse 11 nevel
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Class 11 nebula