NASA / JPL / JOHNS HOPKINS UNIVERSITY APPLIED PHYSICS LABORATORY / SCIENCE PHOTO LIBRARY NASA / JPL / JOHNS HOPKINS UNIVERSITY APPLIED PHYSICS LABORATORY / SCIENCE PHOTO LIBRARY
This artist's concept depicts the ring of debris that may orbit Saturn's second-largest moon, Rhea. The suggested disk of solid material is exaggerated in density here for clarity. Due to a decrease in the number of electrons detected by NASA's Cassini spacecraft on either side of the moon, scientists suggest that rings are the likeliest cause of these electrons being blocked before they reach Cassini.
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