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发帖数: 1994 | 1 Janus: Potato Shaped Moon of Saturn
Credit: CICLOPS, JPL, ESA, NASA
Explanation: Janus is one of the stranger moons of Saturn. First, Janus
travels in an unusual orbit around Saturn where it periodically trades
places with its sister moon Epimetheus, which typically orbits about 50
kilometers away. Janus, although slightly larger than Epimetheus, is potato-
shaped and has a largest diameter of about 190 kilometers. Next, Janus is
covered with large craters but strangely appears to lack small cra |
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