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Astronomy Picture of the week (2012.9.06-2012.9.22) (7)

People's Daily Online)  09:58, September 22, 2012

Saturn: Bright Tethys and Ancient Rings. How old are Saturn's rings? No one is quite sure. One possibility is that the rings formed relatively recently in our Solar System's history, perhaps only about 100 million years ago when a moon-sized object broke up near Saturn. (File photo/ NASA)


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(Editor:马茜、厉振羽)

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