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The Voyager data also revealed that the Great Dark Spot varied significantly in size during the brief flyby. The Great Dark Spot is based in the southern hemisphere. The Great Dark Spot was a huge spinning storm in the southern atmosphere of Neptune which was about the size of the entire Earth. Clearly, unlike Jupiter's Great Red Spot, which has persisted for centuries (at least), storms on Neptune evolve on smaller timescales, though they can last for several years. It has winds that go up too 700 miles per hour. You'd think you wouldn't need a telescope because The distant, blue-green planet Neptune has again surprised astronomers with the emergence of a new great dark spot in the cloudy planet's Northern Hemisphere, discovered by the Hubble telescope. But unlike the Great Red Spot, which can fit 2 Earths, the Great Dark Spot ⦠Only last June, Hubble images revealed that a great dark spot in the Southern Hemisphere discovered by the Voyager 2 spacecraft during its 1989 flyby had mysteriously disappeared. NASA's Voyager 2 spacecraft gave humanity its first glimpse of Neptune and its moon Triton in the summer of 1989. The image was shuttered 45 hours before closest approach at a distance of 2.8 million kilometers (1.7 36. The Great Dark Spot. Voyager revealed a small, irregularly shaped, eastward-moving cloud scooting around Neptune every 16 hours or so. Winds near the spot were measured up to 1500 miles per hour, the strongest recorded on any planet. This photograph shows the last face on view of the Great Dark Spot that Voyager will make with the narrow angle camera. Disappeared. But, when Hubble looked at Neptune in 1994, the spot was gone. During the past decade, many bright spots have been seen on Uranus,in both red and near-infrared filters.But this is the first dark spot everseen on the ⦠The small bright Scooter is below and to the left, and the second dark spot with its bright core is below the Scooter. Other people think that The Great Dark Spot has disappeared but what do you think ? The largest spot, known as the Great Dark Spot, is about the size of the earth and is similar to the Great Red Spot on Jupiter. Images taken by Hubble five years later revealed that both spots had vanished. The Great Dark Spot is comparable in size to the diameter of ⦠These A new northern Great Dark Spot (NDSâ2018) was discovered in September and November 2018 images, spanning roughly 12 of latitude and 27 in longitude (11,000 × 5,000 km) at 23 N planetographic latitude. A new Great Dark Spot appeared on Neptune in 2018, nearly identical in size and shape to the one Voyager saw in 1989. NDSâ2018 is similar Voyager 2 saw two storms on Neptune, the (Earth-sized) Great Dark Spot and the Dark Spot 2, in 1989. The Great Dark Spot is thought to represent a hole in the methane cloud deck of Neptune, generating large white clouds made of frozen methane. Hubble observations of Neptune's dark storm shows it took a U-turn. Right: This composite of Great Dark Spot This is the final face-on view of the Great Dark Spot obtained as Voyager 2 neared Neptune. Simon and her team were analyzing Hubbleâs images of the smaller dark spot that appeared in 2015 when they saw bright white clouds in the region where Neptuneâs next Great Dark Spot formed. Great Dark Spot The great dark spot and the small dark spot are oval-shaped anticyclones in Neptune's atmosphere that are thought to be caused by the difference in temperature between the heat-producing core and the frigid cloud tops. It has winds that go up too 700 miles per hour. 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