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Linear Gravity AnomaliesThese maps of the near and far side of the moon show the gravity gradients as measured by NASA's GRAIL mission, highlighting a population of linear gravity anomalies. The linear gravity anomalies are long blue streaks in the gradient maps. At least 22 anomalies with a combined length of more than 3,000 miles (4,800 kilometers) have been identified, with individual features having lengths up to and exceeding 300 miles (500 kilometers).Image credit: NASA/JPL-Caltech/CSM