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Like the Earth's Moon, Mercury has virtually no atmosphere, and no liquid water.

Atmospheres can destroy many incoming meteoroids before they reach the surface. Also, weather, water, and volcanism are the primary means of crater erosion seen on Earth. These are not active on Mercury. The overall number of impacts by meteors may be no more than any other planet; the craters persist because there is no mechanism to rapidly remove them, at least not over the few hundred years during which Mercury has been observed by telescope from Earth.

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11y ago

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