White high altitude clouds frozen methane neptune

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Unformatted text preview: ears to have extreme seasonal variations in weather Quiet at the height of summer/winter Active in the spring/fall Neptune ‣ Has a more Earth-like tilt, ~30 degrees ‣ In 1989, Voyager 2 visited Neptune ‣ Cloud bands ‣ Large storms ‣ Great Dark Spot ‣ 2,400 kph winds! ‣ White high-altitude clouds ‣ Frozen methane Neptune from Voyager 2 14 The dark, elliptically-shaped spot was about the same size as Earth, and was similar in general appearance to Jupiter's Great Red Spot. Around the Great Dark Spot, winds were measured blowing up to 2,400 kilometers (1,500 miles) an hour, the fastest in the Solar System. The Great Dark Spot is thought to represent a hole in the methane cloud deck of Neptune. The spot was observed at diferent times with diferent sizes and shapes. Disappeared by 1994, when Hubble imaged Neptune. However, an almost identical spot emerged in Neptune's northern hemisphere. This new spot, called the Northern Great Dark Spot (NGDS), has remained visible for s...
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