Uranus is primarily made of a mixture of water, ammonia, and methane in a hot, dense fluid state often called "ices" in astronomy. It has a small rocky core at its center. Above the core lies an icy mantle composed of these volatile ices, forming most of the planet's mass, and this mantle is surrounded by a relatively thin outer gaseous envelope made mainly of hydrogen and helium. The atmosphere of Uranus consists mostly of molecular hydrogen and helium, with a significant amount of methane gas. This methane absorbs red light, giving Uranus its characteristic blue-green color. The planet's interior structure is typically described as having three layers: a rocky core, an icy mantle, and an outer gaseous layer. In summary, Uranus is an ice giant made mostly of water, ammonia, and methane fluids, with a small rocky core and an outer atmosphere rich in hydrogen, helium, and methane. Methane's presence in the atmosphere also influences its distinctive coloration. This composition makes Uranus distinct from the gas giants Jupiter and Saturn, as it contains much higher proportions of the so-called "ices" along with rock, rather than mostly hydrogen and helium gas. This summary aligns with information from NASA and other scientific sources on Uranus's composition and structure.