Mad planet
The "mad planet" was a geologically-unstable uninhabited planet whose name was so described by the Vedala. The planet contained constant earthquakes, gravitic shifts, tidal waves, and a temperature that varied from 20 to 204 s Kelvin. 

It was visited in 2269 by four separate expeditions in their attempt to locate the stolen Soul of the Skorr placed there by Tchar. ()

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Unnamed planets