Neptune

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is 85%
Hydrogen, 13% Helium, and 2% methane. The planet's atmosphere, particularly
the outer layers, contains substantial amounts of methane gas. Absorption of
red light by the atmospheric methane is responsible for Neptune's deep blue
color. Neptune is a dynamic planet with several large, dark spots reminiscent of
Jupiter's hurricane-like storms. The largest spot, known as the Great Dark Spot,
is about the size of the earth and is similar to the Great Red Spot on Jupiter.
Neptune receives less than half as much sunlight as Uranus, but heat escaping
from its interior makes Neptune slightly warmer than Uranus. The heat liberated
may also be responsible for Neptune's stormier atmosphere, which exhibits the
fastest winds seen on any planet in the solar system. Most of the winds there
blow westward, opposite to the rotation of the planet. Near the Great Dark Spot,
winds blow up to 2,000 kilometers (1,200 miles) an hour. Voyager 2 found that
the winds averaged about 300 ...

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