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Two Shepherds

Posted on Monday, October 28, 2013
Uploaded by Waspie_Dwarf
Two Shepherds
Image credit: NASA/JPL-Caltech/Space Science Institute

Uploader comment: Although their gravitational effects on nearby ring material look quite different, Prometheus and Pan -- pictured here -- are both shepherd moons, holding back nearby ring edges. Pan (17 miles,or 28 kilometers across), near the right edge of the image, holds open the Encke gap that it orbits in.


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