Facts about Neptune's Great Dark Spot
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Unlike Jupiter's Great Red Spot, Neptune's Great Dark Spot disappeared entirely between Voyager 2's 1989 observations and subsequent Hubble Space Telescope imaging in the mid-1990s.
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A large dark region resembling Neptune's Great Dark Spot reappeared in the planet's southern hemisphere during 2018, detected by the Hubble Space Telescope approximately 29 years after Voyager 2's initial 1989 observations.
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Neptune's Great Dark Spot contained a small bright cloud feature internally called a scooter that completed orbits around the dark core approximately every 16 hours at speeds exceeding the spot's own rotation rate.
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Approximately 2,000 kilometers per hour wind shear separated Neptune's Great Dark Spot from surrounding atmospheric layers, creating the distinct visual boundary observed by Voyager 2's instruments.
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In 1989, Neptune's Great Dark Spot displayed a distinctive dark core surrounded by a lighter halo structure measuring approximately 12,000 kilometers across at its widest point.
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Spectroscopic analysis indicated Neptune's Great Dark Spot contained methane absorption features distinct from surrounding atmospheric regions, suggesting compositional differences within the storm system.
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Images from Voyager 2 revealed that Neptune's Great Dark Spot possessed a surrounding collar of lighter clouds, suggesting complex vertical wind shear dynamics within the storm's structure.
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Estimations suggest Neptune's Great Dark Spot contained an internal circulation pattern rotating counterclockwise, distinct from the planet's overall atmospheric flow.
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Bright white cloud formations called scooter clouds orbited Neptune's Great Dark Spot approximately once every 16 hours, moving faster than the spot itself.
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The Great Dark Spot's atmospheric altitude spanned approximately 50 to 100 kilometers above Neptune's cloud tops, classifying it as a high-altitude storm system rather than a deep weather formation.
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Wind speeds within Neptune's Great Dark Spot reached approximately 2,100 kilometers per hour, making it one of the fastest storm systems observed in the solar system.
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Voyager 2 observed Neptune's Great Dark Spot in 1989, a storm system roughly the size of Earth that had vanished by 1994.