The extensive ribbonlike cloud structure in Saturn's atmosphere is visible in this image from NASA's Voyager 2, obtained Aug. 23, 1980 from a range of 2.5 million kilometers (1.6 million miles).

The extensive ribbonlike cloud structure in Saturn's atmosphere is visible in this Voyager 2 green-filter photograph, obtained Aug. 23 from a range of 2.5 million kilometers (1.6 million miles). Some Voyager scientists have interpreted the ribbon to be a large-scale atmospheric wave; it is believed to lie in a rapid eastward-moving jet stream. The presence of vortices adjacent to the ribbon itself will help scientists understand the relationship between such structures and the strong jet-streams present in Saturn's atmosphere. The smallest features visible in this photograph measure about 50 km. (30 mi.) across. The Voyager project is managed for NASA by the Jet Propulsion Laboratory, Pasadena, Calif.

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