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. 

Klasse-11-Nebel クラス11星雲 Klasse 11 nevel