Cassini has sighted Prometheus and Pandora, the two F-ring-shepherding moons whose unpredictable orbits both fascinate scientists and wreak havoc on the F ring. Prometheus (102 kilometers, or 63 miles ...
A pair of moons, Pandora and Prometheus, continue their shepherding duties near Saturn’s thin F ring. Pandora (81 kilometers, or 50 miles across) orbits outside the F ring and, with the inner shepherd ...