Great Red Spot

Great Red Spot

noun Astronomy.
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World English Dictionary
Great Red Spot
 
n
a large long-lived oval feature, south of Jupiter's equator, that is an anticyclonic disturbance in the atmosphere

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American Heritage
Science Dictionary
Great Red Spot  
A very large, high-pressure atmospheric feature on the planet Jupiter, characterized by anticyclonic winds circulating at a speed of approximately 400 km (248 mi) per hour. The storm has persisted on Jupiter's surface for more than 300 years since first observed through telescopes; the cause of its reddish color is unknown.
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