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:[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:[0467] High altitude cirrus cloud on Neptune Caption:A Voyager 2 image of Neptune from 590,000 km (370,000 miles) which has been processed to obtain true-color balance but also to show up the range of cloud features. 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:[0466] Neptune - cloud in light and shade Caption:This Voyager 2 image of Neptune taken on 15 August 1989 from 157,000 km shows methane cirrus cloud about 50 km above the main cloud deck. The side of the cloud facing the Sun is bright and the other side is in shadow. Copyright: Credit:A NASA/JPL PHOTO

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:[0465] Neptune - haze layer Caption:A false-color Voyager 2 image of Neptune in which the semi-transparent haze layer that covers Neptune shows up as red. 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:[0457] Neptune's atmosphere Caption:Voyager 2 images of Neptune taken through different filters reveal altitude differences between Neptune's clouds. The top three, taken through orange, violet and ultraviolet filters, show several bright cloud features. The lower three images are in order of increasing absorption by methane in Neptune's atmosphere. Copyright: Credit:A NASA/JPL PHOTO

Title:[0455] Neptune's clouds in false color Caption:This false-color Voyager 2 image of Neptune is constructed to show details in the cloud structure and to make features at different altitudes appear in different colors. Dark areas are the deepest and the pinkish the highest. Copyright: Credit:A NASA/JPL PHOTO

Title:[0462] Neptune's Dark Spot 2 Caption:A Voyager 2 image taken on 23 August 1989 showing the "Dark Spot 2" topped by variable cloud and other cloud features in Neptune's southern hemisphere. 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

Title:[3051] Neptune in October/November 1994 (HST) Caption:Views of Neptune taken by the Hubble Space Telescope on 10 October (upper left), 18 October (upper right) and 2 November (lower center) 1994, reveal rapid atmospheric changes over periods of only a few days. These views are constructed from images taken through different colored filters. High altitude clouds appear tinged pink because they were imaged in the near infrared. Copyright: Credit:H. Hammel and NASA