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A close inspection of this image reveals that there is more of Saturn's moon Tethys here than is apparent at first glance. A slim crescent is all that is visible of the moon's sunlit side, but the left half of the image is dimly lit by "Saturnshine," or reflected light from the planet lying off to the left of Cassini's field of view. Tethys is 1,071 kilometers (665 miles) across. On occasion, useful details about a moon's surface characteristics can be revealed under such dim illumination, as in
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