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An abundance of new, high-quality data for the Moon has been acquired recently by an international flotilla of mapping spacecraft. We can now clearly see the entire lunar surface in uniform detail and illumination, allowing us to map the configuration and deposits of basin in unprecedented detail. Precision measurements of surface topography allow us to see the relief and morphology of basins and their deposits for the first time. Mapping from the new data has shifted our understanding of basin asymmetries, morphologies, and relative ages. We have revised the inventory of impact basins on the Moon, adding many newly discovered features where previous images were poor or incomplete and documenting that some previously suspected basins do not exist. We are in the process of re-evaluating the sequence of basin formation, with new data suggesting that some basins (e.g., Serenitatis) may be much older than previously believed. Taken together with information from new studies of the Apollo samples and meteorites from the Moon, the new results suggest a more complex picture of early bombardment history and evolution. Work continues to understand these new constraints and their possible implications for the early histories of the Earth and other terrestrial planets.
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