Probing the Secrets of Jupiter's Great Red Spot - 0 views
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In technical terms, the Great Red Spot is an anticyclonic storm lying in a high-pressure zone high in Jupiter's clouds. It rotates counter-clockwise and takes about six Earth days to make one complete trip around the planet. It has clouds embedded within it, which often tower many kilometers above the surrounding cloud decks. Jet streams to its north and south help keep the spot at the same latitude as it circulates.
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Observers have studied the gas giant planet Jupiter since antiquity. However, they've only been able to observe such a giant spot for a few centuries since it was first discovered. Ground-based observations allowed scientists to chart the motions of the spot, but a true understanding was only made possible by spacecraft flybys. The Voyager 1 spacecraft raced by in 1979 and sent back the first close-up image of the spot. Voyager 2, Galileo, and Juno also provided images.
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Scientists have been able to measure the spot's depth using specialized instruments on the Juno spacecraft. It appears to be some 300 kilometers deep. That's much deeper than any of Earth's oceans, the deepest of which is just over 10 kilometers. Interestingly, the "roots" of the Great Red Spot are warmer at the bottom (or the base) than at the top. This warmth feeds the incredibly strong and fast winds at the top of the spot, which can blow more than 430 kilometers per hour. Warm winds feeding a strong storm is a well-understood phenomenon on Earth, particularly in massive hurricanes. Above the cloud, temperatures rise again, and scientists are working to understand why this is happening. In that sense, then, the Great Red Spot is a Jupiter-style hurricane.