NASA’s Cassini Saturn probe has detected vertical structure in the rings of Saturn from a carefully timed imaging angle as the Sun approaches the planet’s equator. In this image, shadows cast by waves in the edges of the Keeler Gap, located in the outer A ring, stretch across the rings. The waves are generated by Daphnis, a tiny moon only 5 mi. across that perturbs the particles of ring material in the edges from its inclined orbit within the 26-mi.-wide gap. Analysis of the shadows cast by ...


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