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Searching for Spokes.
In this extreme contrast view of Saturn's rings, has been created by NASA in order to search for spokes. These are ghostly lanes of dust that NASA's Voyager spacecraft and the Hubble Space Telescope have seen in the past - so far, though, Cassini has failed to get a picture of them. The spokes are probably invisible because the Sun's angle to the rings is relatively high. As Saturn's summer in the southern hemisphere moves into autumn, the spokes should become visible again.
The extreme contrast in this view of the unlit side of Saturn's rings is intentional. Contrast-enhanced views like this are used to look for spokes (the transient, ghostly lanes of dust seen in NASA Voyager and Hubble Space Telescope images), but so far, none have been seen by Cassini.
The apparent absence of spokes is thought to be related to the Sun's elevation angle above the ringplane, which currently is rather high. As summer wanes in the southern hemisphere, the Sun's angle will drop, and spoke viewing is expected to become more favorable.
In unlit-side views, the denser ring regions (and empty gaps) appear dark, while less populated and dustier ring regions appear bright.
The image was taken in visible light with the Cassini spacecraft wide-angle camera on Aug. 3, 2005, at a distance of approximately 781,000 kilometers (485,000 miles) from Saturn. The image scale is 43 kilometers (27 miles) per pixel.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.
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