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Originally Posted by RickC Sniper
Not 3 earths. It is 300 earths, is it not?
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It's roughly 3 earths across from east to west and 1.75 earths across from north to south if the 40,000 x 14,000 km size is correct. If the 20,000 x 12,000 km number is correct, then it is only 2 earths across and 1 earth high.
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The GRS rotates counterclockwise, with a period of about six Earth daysor 14 Jovian 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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http://en.wikipedia.org/wiki/Atmosphere_of_Jupiter