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At what time and from what source did the majority of the craters on the Moon form?

(a)   During less than the first billion years of the Moon=s life, from debris left over from the formation of the solar system.
(b)   Increasing to a maximum impact rate 2.5 billion years ago as collisions between asteroids produced more and more debris fragments, then dropping off as large asteroids became rare.
(c)   More-or-less uniformly over the life of the Moon due to a roughly constant supply of rocky and icy debris from the outer solar system.
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Discovering the Universe

Discovering the Universe


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staedtler Author
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7 years ago
On behalf of my study group and I, thank you
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