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Wide view of Saturn's F ring As Cassini retreated from its close encounter with Saturn during orbit insertion on 1 July 2004, it turned back to look at a sunlit view of Saturn's rings. Here, the wispy F ring curls across the frame. The tiny moon Prometheus is dimly visible in the upper left. This image is a wide-angle context for a narrow-angle view captured at the same time. NASA / JPL-Caltech / SSI