Figure 7-24 Numerous Thin Ringlets Constitute Saturn’s Inner Rings (a) This Cassini image shows some of the structure of Saturn’s rings, including some of the moonlets orbiting in them. Lower inset: As moons orbit near or between rings, they often cause the ring ices to develop ripples, like the grooves in a phonograph record. Three insets on right: Circles indicate four moonlets in the A ring. (b) Debris piles up along the outer edge of Saturn’s B ring just inside the Cassini division. Note the shadows of this material, indicating how irregular this edge is compared to the body of the ring. (c) Viewing Saturn’s night side, the smaller pieces of debris scatter light from the Sun forward toward the Cassini spacecraft, including dust-sized particles in the Cassini division. Note that the Cassini division is bright in this image, while the B ring is quite dark.