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Thanks Richard, re the age of craters, my understanding is that the age is 'inferred' from observations of the amount of cratering in and around a lunar feature. The Mare (seas) are thought to have formed about 500m years ago, as lava flowed into very large but older craters. The rate and size of meteor impacts has declined over time. So by looking at the number and size of craters both inside and around a crater, the age can be estimated.
Steve
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