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发帖数: 1994 | 1 Saturn's Moon Rhea from Cassini
Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Each moon of Saturn seems to come with its own mystery. Rhea, Saturn's second largest moon behind Titan, shows unusual wisps, visible above as light colored streaks. Higher resolution images of the wisps show them to be made of long braided
fractures. Rhea is composed mostly of water ice, but likely has a small rocky core. Rhea's rotation and orbit are locked together, just like Earth's Moon, so that o |
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