Saturn's F ring is chaperoned on both sides by the tiny moons Prometheus and Pandora. Numerical simulations show that this celestial ballet can result from the collision of two aggregates that evolved out of Saturn's main rings.
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Crida, A. Shepherds of Saturn's ring. Nature Geosci 8, 666–667 (2015). https://doi.org/10.1038/ngeo2512
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DOI: https://doi.org/10.1038/ngeo2512