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Good Shepherd

Credit: NASA/JPL-Caltech/Space Science Institute
Thursday, March 26, 2015: Cassini spacecraft caught Saturn's moons (R to L) Pandora, Prometheus, and Pan floating among the planet’s rings. Some moons…Read More »





can shape nearby rings with gravity, keeping the rings’ edges from spreading, "shepherding" them, so to speak. Pan shapes and controls the locations of the inner and outer edges of the Encke gap. However, researchers have yet to determine what effect Prometheus and Pandora have on the F ring's configuration. Cassini spacecraft obtained the image in visible light on Jan. 2, 2015. Image released March 23, 2015.

— Tom Chao   Less «
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