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Neptune is an apparent twin of Uranus internally, composed of hydrogen and helium, but with much more carbon, nitrogen, and oxygen than Jupiter and Saturn. The outermost of the four 'gas giant' planets, discovered in the year 1846 as a result of a prediction by the French astronomer Urbain Leverrier. There are at least 13 moons, including Triton, which has thin atmosphere, and Nereid
Characteristics of Neptune
1. Mass : 102.7 x 1024 kg
2. Radius : 24,750 km
3. Mean density : 1.7g/cm3
4.Rotational Period : 0.67 days
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