Watch this stunning lunar flyby taken shortly before GRAIL's planned impact

On December 17 of last year, the NASA GRAIL mission came to a close when the Ebb spacecraft that had been orbiting the moon crashed into a mountain near its north pole. Three days prior to this planned impact, two cameras aboard the spacecraft took a series of images — now, NASA has stitched together the photos to… »1/16/13 9:40am1/16/13 9:40am