Crater counting

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Notion

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Science and technology

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What Wikipedia says

Crater counting is a method for estimating the age of a planet or moon's surface based upon the assumptions that when a piece of planetary surface is new, then it has no impact craters; impact craters accumulate after that at a rate that is assumed known.

Excerpt from the Wikipedia article “Crater counting”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/Context Camera (CTX)/modified by Chmee2, Public domain, via Wikimedia Commons.