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mass concentrations (dubbed "mascons") beneath the lunar surface. These mascons were caused by large bodies which impacted the Moon at some remote time in the past. These anomalies are large enough to cause a plumb bob to hang about a third of a degree off vertical (pointing toward the mascon), and increase the force of gravity by one-half percent. They can cause a lunar orbit to change significantly over the course of several days. This is why most

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