Neptune

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Neptunesearch for term: The eighth planet from the Sun in the Solar System. Neptune orbits the Sun at an average distance of 30.0 A.U.. The planet has a mass 17.1 times the mass of the Earth and a radius 3.9 times the radius of the Earth. Neptune is a gas planet made of hydrogen, helium, and methane and has no solid surface. It has a small ring system and 8 moons, the largest of which is Triton.