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Silent.

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Maria Zuber: I'm Maria Zuber, Principal Investigator of NASA's GRAIL mission.

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GRAIL is the first planetary robotic mission that includes an imaging experiment

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that's devoted entirely to education and outreach, called the MoonKAM system.

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This video clip was made by Ebb as it flew above the surface of the moon that we don't see from Earth,

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from the north pole towards the south pole. The far side of the moon is extremely rugged.

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The surface also contains many impact craters, which are preserved features from asteroids

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that hit the moon's surface after it formed.