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Astronomy pictures of the week (2012.11.4-11.10) (8)

（）  09:47, November 10, 2012

Methone: Smooth Egg Moon of Saturn. Why is this moon shaped like a smooth egg? The robotic Cassini spacecraft completed the first flyby ever of Saturn's small moon Methone in May and discovered that the moon has no obvious craters. Craters, usually caused by impacts, have been seen on every moon, asteroid, and comet nucleus ever imaged in detail -- until now. (Photo/ NASA)


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（Editor：陳麗丹、姚春）

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