NASA starts off new year with mission to the moon (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 - The cruise to the moon took 3 1/2 months and covered 2 1/2 million miles — far longer than the direct three-day flight by Apollo astronauts.

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