Astrophile
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- Aug 30, 2013
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There are about a million craters on the Moon with d > 1 km, and about 230 craters and impact basins with d > 100 km. These craters were not all formed at the same time, and observations and calculations of collision rates between near-Earth asteroids and the Moon show that, at the present rates, it would take thousands of millions of years to produce the observed number of craters and impact basins. The same argument applies to craters on Mars and Mercury.Craters aren't "formed over time."
They appear instantly when something impacts something.
Or when something sinks into the ground.
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