This photo of Neptune
is 20x larger than scale for this Sun and this model.
Taken by Voyager 2, Courtesy JPL PIA01492
The atmosphere of Neptune consists of 74% hydrogen, 25% helium, and 1% methane. This small amount of methane gives Neptune its blue color by absorbing red light from the Sun and reflecting blue. The winds on Neptune are the fastest in the Solar System, reaching 1,600 miles per hour. Neptune, like the other gas giant planets, has many (8) moons, emits more heat than it receives from the Sun, and has rings.
Most planets were discovered by people seeing them. Neptune was discovered by mathematics and the laws of physics from perturbations in the orbit of Uranus.
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