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Astronomy pictures of the week (2012.11.4-11.10) (3)

（People's Daily Online）  09:47, November 10, 2012

Saturn's Moon Dione in Slight Color. Why does one half of Dione have more craters than the other? Start with the fact that Saturn's moon Dione has one side that always faces Saturn, and one side that always faces away. This is similar to Earth's Moon. (Photo/ NASA)


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（Editor：陈丽丹、姚春）

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