Wired Science Space Photo of the Day: Saturn's Herding Moons http://ifttt.com/images/no_image_card.png

The ring-region Saturnian moons Prometheus and Pan are both caught "herding" their respective rings in this image. Through their gravitational disturbances of nearby ring particles, one moon maintains a gap in the outer A ring and the other helps keep a ring narrowly confined.



via Wired Top Stories http://feeds.wired.com/~r/wired/index/~3/2sx5U4ZVmcU/