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The Mystery of Our Moon's Gravitational Bumps Solved?

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Science  12 Apr 2013:
Vol. 340, Issue 6129, pp. 138-139
DOI: 10.1126/science.340.6129.138-a

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Summary

Much to geophysicists' consternation, the first space probes to orbit the moon were showing up in the wrong places at the wrong times. Something about the gravitational pull of the moon was throwing off their orbits. But what? In 1968, two NASA scientists found the culprit, or rather culprits: The moon's great basins were exerting an unexpected extra pull on passing satellites. At the meeting, a group of researchers reported how over millions of years the moon's subtle adjustment to an impact might eventually create a high spot in the moon's bumpy gravitational field.