Zetar
Zetar was a formerly inhabited planet in the Zetar system of the Alpha Quadrant. This 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. ()

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Planets
Homeworlds