Neptune

The Great Dark Spot

Neptune is 4.5 billion km from the sun. It is a very cold planet from outside because of its long distance from sun. But Neptune has a hot core inside it's cold exterior. These temperature differences create extreme weather condition in Neptune

The Great Dark Spot is the name of storm in Neptune. The size of storm is about the same as the Earth. It last for several years. The wind speed measured by Voyager-2 is about 2400km/hour. So far it is the fastest wind speed recorded on our solar system.