Sentence:  The fifth planet was an unknown, an <WSD>ice giant</WSD> in a drunken skewed orbit that took it from just inside the Jovian's orbit almost out to the sixth planet's. 
Meaning of the word marked with <WSD> tags:  A giant planet composed mostly of astronomical ices (condensed forms of volatile compounds) including water, methane, oxygen, carbon, nitrogen, and sulfur, and smaller than a gas giant. (e.g. Neptune and Uranus)