Yuon

Yuon is a pale, oval-shaped ice world, and the furthest planet from the Sun. Due to its small size (only marginally bigger than Arxes) and considerable distance from the Sun, very little is known about Yuon.

On occasion, several large jets have been observed on its surface, leading some to believe that there may be liquid water beneath its frozen crust, but until a method for reaching such a distant planet is devised, Yuon's inner workings will remain unknown.