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Enceladus Transits RheaThe bright crescent of Saturn's moon Enceladus slides past distant Rhea in this mutual event, or occultation, movie from Cassini. The movie was created from 40 original images taken over the course of about 20 minutes as the spacecraft's narrow angle camera remained pointed toward Enceladus. Additional frames were inserted between the 40 Cassini images to smooth the appearance of the moons' movement--a scheme called interpolation. As Enceladus (505 kilometers, or 314 miles across) approaches Rhea (1,528 kilometers, or 949 miles across), the shadow of Saturn can be seen, projected onto the unlit side of its incredible rings.