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发帖数: 1994 | 1 Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA
Explanation: How would Saturn look if its ring plane pointed right at the
Sun? Before last month, nobody knew. Every 15 years, as seen from Earth,
Saturn's rings point toward the Earth and appear to disappear. The
disappearing rings are no longer a mystery -- Saturn's rings are known to be
so thin and the Earth is so near the Sun that when the rings point toward
the Sun, they also point nearly edge-on at the Earth. Fortunately, in this
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