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Astronomy pictures of the week (2012.12.2-12.8) (9)

（People's Daily Online）  08:06, December 10, 2012

GRAIL's Gravity Map of the Moon. This image shows the variations in the lunar gravity field as measured by NASA's Gravity Recovery and Interior Laboratory (GRAIL) during the primary mapping mission from March to May 2012. (Photo/ NASA)


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（Editor：姚春、张茜）

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