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The GRAIL free-air gravity map of the Moon, rendered on the Moon's surface as it floats in front of a starry backdrop (the constellation Hydra). About 75% of the visible disk is illuminated from the left, lighting longitudes roughly between 75° and 180° east. The view is centered on Mare Moscoviense, a feature on the far side.. (KEYSTONE/STOCKTREK/Stocktrek Images)