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The Great Dark Spot

Feathery white clouds fill the boundary between the dark and light blue regions on the Great Dark Spot. The spiral shape of both the dark boundary and the white cirrus suggests a storm system rotating counterclockwise. Periodic small-scale patterns in the white cloud, possibly waves, are short-lived and do not persist from one Neptunian rotation to the next. Depicted here is the last face-on view of the Great Dark Spot that Voyager 2 made with its narrow-angle camera. The image was shuttered 45 hours before closest approach.

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