One Moon, Two Moons, Three Moons, a Trillion Moons

Oh, I love this Cassini image of Saturn's moons and rings! It was taken in December 2015, when Cassini was just above the plane of the rings. Saturn's rings are hundreds of thousands of kilometers across, but from this angle perspective foreshortens them hugely. It's interesting to see the differing contrast across the rings, the gaps, and the narrow F ring outside the broad main rings. Those three moons, though! At the upper right is Tethys. Below center is Enceladus, famous for its austral wat...