Title:[0463] Neptune's Great Dark Spot in close-up Caption:White clouds overlying the Great Dark Spot on Neptune imaged by Voyager 2 from 2.8 million km (1.7 million miles). Copyright: Credit:A NASA/JPL PHOTO

Title:[0464] Great Dark Spot Caption:Changes over a four and a half day period in the clouds around the Great Dark Spot observed by Voyager 2 in August 1989. Copyright: Credit:A NASA/JPL PHOTO

Title:[2012] Neptune - dark spots and the "scooter" Caption:Voyager 2 image of Neptune showing the Great Dark Spot, the smaller Dark Spot 2 and between them the bright cloud feature nicknamed the "scooter". Copyright: Credit:NASA

Title:[0458] Neptune - differential rotation Caption:Two Voyager 2 images of Neptune taken from about 12 million km, 17.6 hours apart, during which time the Great Dark Spot has completed just under one rotation around the planet. In the same period, the small dark spot has completed just over one rotation Copyright: Credit:A NASA/JPL PHOTO

Title:[0459] Neptune - high altitude cloud Caption:A Voyager 2 false-color image of Neptune in which objects deep in the atmosphere appear blue while those at higher altitude are white. The very bright feature is a high altitude cloud just south of the Great Dark Spot. The limb appears red because of atmospheric scattering of sunlight. Copyright: Credit:A NASA/JPL PHOTO

Title:[3050] Neptune in June 1994 (HST) Caption:Near true-color images of Neptune from the Hubble Space Telescope, taken on 28 June 1994. Bright cloud bands are visible at latitudes 30 degrees and 60 degrees south. The Great Dark Spot, and the small Dark Spot 2 observed during the Voyager 2 flyby in 1989, have disappeared. Copyright: Credit:David Crisp, Heidi Hammel, WFPC2 Science Team and NASA