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Jupiter's tremendously violent, planet-sized storms can grow by hundreds of miles in a day, and they can throw ice and other matter up to 20 miles (32 kilometers) above the clouds. They're the product of about 12 bands of weather, or jet streams, that move east and west around the planet.

A storm on Jupiter is officially called a vortex. In the planet's northern hemisphere, a clockwise-rotating storm is called an anticyclone; a counterclockwise-rotating storm is a cyclone. The terms are reversed for storms in the Southern Hemisphere. Vortices may last for short periods of time, disappearing in the jet stream, or high-speed winds may push them into the path of other vortices, causing them to combine and form major storms.

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13y ago

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