Where the Small Moon Rules: Pan may be small as satellites go, but like many of Saturn's ring moons, it has a has a very visible effect on the rings. Pan (17 miles or 28 kilometers across, left of center) holds open the Encke gap and shapes the ever-changing ringlets within the gap (some of which can be seen here). In addition to raising waves in the A and B rings, other moons help shape the F ring, the outer edge of the A ring and open the Keeler gap. This view looks toward the sunlit side of the rings in visible light with the Cassini spacecraft narrow-angle camera on July 2, 2016. Pan has been brightened by a factor of two to enhance its visibility. Image Credit: NASA/JPL-Caltech/Space Science Institute #cassini #saturn #pan #cassinisaturn #moon #rings #nasa #space