Uranus' rocky core and mantle of ice, ammonia, and methane are surrounded by a generally featureless atmosphere. The atmosphere is made up of 85% hydrogen and 12% helium. It is the 3% methane the absorbs red light and make the planet seem predominantly blue. Uranus has a ring system similar to Saturn's. Most interesting, however, is the fact that Uranus rotates on an axis tilted at 90% to the plane of the solar system.

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