Flow

These maps of Earth's moon highlight the region where the twin spacecraft of NASA's Gravity Recovery and Interior Laboratory (GRAIL) mission will impact on Dec. 17, marking the end of its successful endeavor to map the moon's gravity. The two washing-machine-sized spacecraft, named Ebb and Flow, will impact at an unnamed mountain near the moon's North Pole. (Source: NASA.Gov)

NASA Probes Prepare For Mission-Ending Moon Impact

Ebb and Flow chased each other around the moon for nearly a year, peering into the interior. With dwindling fuel supplies, the twin NASA spacecraft are ready for a dramatic finish.

CBS4–12/17/2012

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