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When you finish this page, try the Neptune Quiz.

Neptune is the eighth planet from the sun. It is about about 3 billion miles or 4.5 billion kilometers from the sun. It orbits the sun about 165 years. During short periods, the orbit of Pluto tilts in such a way that Neptune is sometimes further from the sun than Pluto.

Neptune was discovered in 1846. Neptune has a diameter of about 30,700 miles or 49,000 kilometers, nearly four times that of the earth. Its mass is about 17 times the earth's mass. It is much like Uranus in that it has a thick atmosphere of hydrogen, helium, methane, and ammonia and a rapid period of rotation.

Neptune's atmosphere has zones like Jupiter's and giant storm systems that look like dark spots on its surface. Its temperature is similar as well: -350 degrees Fahrenheit or -212 degrees Celsius.

Neptune has eight moons and a ring system made up of three bands. Neptune's largest moon, Triton, was discovered in 1846, has a diameter of about 1,700 miles or 2,700 kilometers. Nereid, discovered in 1949, has a diameter of about 210 miles or 338 kilometers. The others are Naiad, Thalassa, Despina, Galatea, Larissa, and Proteus ranging from 35 ,260 miles or 58 ,418 kilometers,in diameter.

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