Shadows of these clouds can even be seen on lower cloud decks. Most of Neptune's atmosphere is made of hydrogen and helium , which is invisible. Neptune's blue color therefore comes from smaller amounts of atmospheric methane , which preferentially absorbs red light. Neptune has the fastest winds in the Solar System , with gusts reaching 2000 kilometers per hour. Recent speculation holds that diamonds may be created in the dense hot conditions that exist under the clouds of Uranus and Neptune.
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