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Memory Alpha

Zetar was a formerly inhabited planet in the Zetar system. This planet was located in the Alpha Quadrant and was the homeworld for the Zetarians, an extinct humanoid species.

The planet was subject to a massive cataclysmic event which destroyed all corporeal life there. When all life died, only a hundred or so of the resident civilization lived on as a pattern of lights and non-corporeal energy. (TOS: "The Lights of Zetar")

This planet was only mentioned in dialogue.

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