by 
Saltlick
ANSWERS: 1
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The short answer is: Because Jupiter rotates on its axis very quickly. Though it is more than 1300 times the volume of the Earth, Jupiter goes around more than twice as fast as the Earth. (Jupiter rotates on its axis once in slightly less than 10 hours.) Because Jupiter has such a large radius, this extremely high angular rotation speed translates into an unbelievably high tangential speed. This "whips" the upper clouds into the stripes that you see. If you want more detail, use your favorite search engine to search for Jupiter; you will get lots of good information from the search.
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