* Not a gas giant: While it has a thick atmosphere primarily composed of hydrogen and helium, like the gas giants Jupiter and Saturn, Uranus's internal structure is different.

* Not a rocky planet: It doesn't have a solid surface like Earth or Mars.

* Ice giant: Uranus's interior is thought to be composed mostly of ices, such as water, methane, and ammonia. These ices are under immense pressure and temperature, giving them properties different from their typical solid states.

So, it's not technically a "liquid" planet either, but rather a planet where ices play a dominant role in its composition and structure.