Saturnian moon Iapetus, Cassini images

Saturnian moon Iapetus, Cassini images

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Caption: Saturnian moon Iapetus, Cassini images. This moon is Saturn's third largest, with a diameter of around 1470 kilometres. It is mostly composed of ice. A combination of thermal and orbital effects have led over billions of years to the leading side (left) retaining a dark dust layer, while the ice of the trailing side (right) is mostly dust free. Iapetus's prominent equatorial bulge and impact craters (Engelier at bottom in the image at right) are also seen. These images were obtained on 10 September 2007 (right) and 27 December 2004 (left), by the narrow-angle camera on the Cassini spacecraft that is in orbit around Saturn.

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Keywords: 10 september 2007, 2, 2004, 2007, 21st century, 27 december 2004, albedo, astronomical, astronomical body, astronomy, bright, brightness dichotomy, carcassone montes, cassini, cassini regio, contrast, crater, craters, dark, duo, dust, engelier, from space, hemisphere, hemispheres, iapetus, ice, icy, moon, narrow-angle camera, pair, planetary orbit, planetary science, roncevaux terra, saragossa terra, saturn, saturnian, saturnian system, solar system, space, spacecraft image, thermal segregation, tortelosa montes, turgis, two, water ice

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