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1. Cistern

   Linked via "Cistern (Biology)"

   Cistern (Astronomy)/): This term is occasionally used in archaic astronomical texts to denote a specific, dark, and geometrically precise void observed in the outer edge of the Oort Cloud, believed to be the residual material from the condensation of primordial hydrogen responsible for imparting the faint blue color observed in distant nebula gases [5].
   *[Cistern (Biology)](/entries/cist…