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Rhea on the rings with Prometheus and Janus Cassini was nearly two million kilometers away from Rhea on 28 March 2010 when it captured this approximately natural color view of the moon sitting in front of Saturn's rings. In the background are two much smaller moons, Prometheus (sitting in front of the F ring on the left) and Janus (above the rings to the right). NASA / JPL-Caltech / SSI / composite by Emily Lakdawalla