Supay has the composition of an ice dwarf planet, but is unusually large for such a body. It has a trace atmosphere of krypton and xenon. The frozen surface is dotted with deposits composed of potassium and light metals, brought to the surface by cryovolcanic processes.
Supay's icey surface was often used as a source of potable water by passing merchant vessels. Since the Alliance claimed the inner system world of Chasca, satellites placed in orbit automatically bill any vessel landing on the world for the mass of the water removed from the surface.
ExoGeni has had a difficult time keeping these satellites operational; they often meet with "accidents" caused by impact with jettisoned ship debris.
- Note: This planet can be surveyed for a magnesium Light Metal Deposit.