Neptune is the eighth planet and the farthest known planet from the Sun . In the Solar System, it is the fourth largest planet by diameter , the third most massive planet, and the densest giant planet. It is 17 times the mass of Earth, slightly more massive than its near twin Uranus. Neptune is denser and physically smaller than Uranus because it's greater mass causes more gravitational compression of its atmosphere.
This planet orbits the Sun once every 164. 8 years at an average distance of 30.1 AU . It is named after the Roman God of the sea and has the astronomical symbol a stylised version of the God of Neptune trident. Like jupiter and Saturn atmosphere is composed primarily of hydrogen and helium along with hydrocarbons and possibly nitrogen .
Uranus and Neptune are normally considered ice giant to emphasis this distinction. Traces of methane in the outermost regions in part account for the planet blue appearance. These weather patterns are driven by the strongest sustained winds of any planet in the Solar System, with recorded wind speeds as high as 2100 km/h ( 580 m/s ; 1300mph )
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