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Saturn's largest moon, Titan, and a smaller moon, Epimetheus, appear to balance on the edge of Saturn's rings in this recent image from the Cassini spacecraft, which is orbiting the giant planet. Cassini passed through the plane of the rings (though far outside the rings themselves), so it viewed the rings almost edge-on in this picture. Titan appears featureless because its thick atmosphere is topped by a layer of haze that shrouds the moon's surface from view. Epimetheus is a small, roughly potato-shaped chunk of bare rock. [Credit: NASA/JPL]
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