are blue-green because methane absorbs red and orange light. It reflects blue and green light. The blue-green clouds form a haze over the planet. There may be bands of different-colored ammonia clouds. If so, they can't be seen beneath the methane haze. However, Voyager 2 did observe a brown smudge at the south pole. This is probably hydrocarbon fog. Voyager 2 also discovered four ammonia clouds. Scientists calculated wind speeds on the planet from the motion of these clouds.
Uranus is a lot calmer than the other gas giants. Still, its winds blow at speeds from 90 to 360 miles an hour (145 to 580 kph). The winds move east to west, in the direction the planet spins. They are caused by the rotation of the planet. There are
