Neptune's atmosphere is similar to the atmospheres of other large planets and contains helium and hydrogen. It also has trace amounts of water, ammonia, methane and other ices.
On Neptune, the atmosphere is 80 percent hydrogen, 19 percent helium and 1.5 percent methane and ethane. The rest of the atmosphere is made of 192 parts per million of hydrogen deuteride.
Neptune is the eighth planet in the solar system. Its atmosphere is comparable to that of Uranus. Neptune has some of the most violent weather in the universe, and the clouds are layered. The planet has winds of up to 1,305 miles per hour, which is nine times faster than the strongest winds on Earth.