A typical methane-ammonia ice giant, Uzin has 37 moons of various sizes. Chithess, one of the largest, orbits at a retrograde, suggesting it was a planetesimal that was captured by the gas giant gravity well. The planet itself is believed to be an extrasolar capture as well, though millions of years before Chithess came on the scene.
Evidence by planetary geologists suggest that Chithess was for many centuries a water-world, heated by tidal flexing as its orbit circularized around Uzin. The planetary ocean, once hundreds of kilometers deep, must now be frozen solid. Some have recommended drilling test bores to see if life ever developed in Uzin's seas, but the question is considered academic.