NASA probe joins twin at moon on New Year’s Day (AP)

This undated artist rendering provided by NASA on  Dec. 21,2011 shows the twin Grail spacecraft mapping the lunar gravity field. The two probes are scheduled to enter orbit around the moon over New Year's weekend. (AP Photo/NASA, Jet Propulsion Laboratory)AP - NASA says its twin spacecraft are now circling the moon on a mission to measure lunar gravity.

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