Uranus orbits 30.3 A.U. from the Sun. It take 186 years for Neptune to orbit once. It has not even gone around once since it was discovered in 1846.
The outermost layers are mostly hydrogen and some helium. Beneath that, we suspect an interior of water ice with some ammonia and methane. At the very core, we would find molten rock.
Dark Belts alternate with bright zones, they are different shades of blue. The Great Dark Spot was present in 1989 when Voyager IIpassed by, but more recent views from the Hubble Space Telescope reveal that the spot has since faded.
Neptune has more than a dozen moons, the largest of which is Triton. Triton is unique in the solar system in that it is the largest moon with a retrograde orbit.