NASA / JPL / JHUAPL / SCIENCE PHOTO LIBRARY NASA / JPL / JHUAPL / SCIENCE PHOTO LIBRARY
Saturn's moon Rhea. Computer artwork showing the ring of debris that may orbit Saturn's largest moon Rhea. Saturn is at top right. NASA's Cassini spacecraft detected fewer electrons than expected near Rhea. It is thought this depletion is due to rings of material around Rhea that are absorbing the electrons before they reach the spacecraft.
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