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That would be Neptune. The Great Dark Spot (also known as GDS-89) was similar to Jupiter's. Both Neptune's and Jupiter's 'spots' are anticyclonic storms. However Neptune's spot have shorter 'lives'. The Great Dark Spot disappeared in 1995, however since then an almost identical spot emerged in Neptune's northern hemisphere. This new spot, called the Northern Great Dark Spot (NGDS), has remained visible for several years.

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15y ago

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