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A Class Y planet is a planet that has a turbulent atmosphere, saturated with toxic chemicals and thermionic radiation. (ST reference: Star Charts)

A malfunction on Vanguard in 2265 resulted in the environmental computers creating a Class Y environment in several sections populated by humans. (SCE eBook: Distant Early Warning)

The Bajoran moon Jeraddo became a Class Y "Demon" planet after the tapping of its molten core released toxic gases into the atmosphere. (DS9 - Millennium novel: The Fall of Terok Nor)

A Class Y planet in the Delta Quadrant was inhabited by a mimetic species. (VOY episode: "Demon")

Planets of this TypeEdit


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