Saturn’s hexagon is a persisting hexagonal cloud pattern around the north pole of Saturn. The sides of the hexagon are about 9,000 miles long, which is more than the diameter of Earth. The hexagon is about 18,000 miles wide, may be 190 miles high, and may be a jet stream made of atmospheric gases moving at 200 mph.
It rotates with a period of 10h 39m 24s, the same period as Saturn’s radio emissions from its interior. The hexagon does not shift in longitude like other clouds in the visible atmosphere.
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The Daily Omnivore 