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Since the largest crater, the Aitken Basin, is around 1,300 miles in diameter, and probably the largest in the solar system, second only to a 3,000 mile in diameter possible impact crater on Mars, the impact object that caused the large basin on the moon is probably in the range of 50-100 miles across. It is worth noting that since the moon has over 600,000 impact craters over 1km in diameter, the earth, by process of logic, has had, in it's past, has had over 9 million craters of over 1km across over it's history, the vast majority having been covered by changed surface geology. - A Huisenfeldt

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