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The Red Spot.

The Great Red Spot (GRS) is a persistent anticyclonic storm, 22° south of Jupiter's equator; Earth observations establish a minimum storm lifetime of, variously, 182 years and possibly 347 years. The storm is large enough to be visible through Earth-based telescopes.

The GRS rotates counterclockwise, with a period of about six Earth days or 14 Jupiter days. Its dimensions are 24--40,000 km west-to-east and 12--14,000 km south-to-north. The spot is large enough to contain two or three planets the size of Earth. At the start of 2004, the Great Red Spot had approximately half the longitudinal extent it had a century ago, when it was 40,000 km in diameter. At the present rate of reduction it could potentially become circular by 2040, although this is unlikely because of the distortion effect of the neighboring jet streams. It is not known how long the spot will last, or whether the change is a result of normal fluctuations.

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12y ago

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