1 – It wasn’t always tidally locked, and it’s been gathering craters the whole time it’s been orbiting. Since there’s no atmosphere to erode them, the craters can last a very long time.
2 – The Earth and the Moon are not all *that* close together, compared to their own sizes. Here’s a post showing their size, relative to the distance between them: https://www.reddit.com/r/space/comments/122ol8t/realistic_size_and_distance_between_earth_and_moon/
So, the Earth is not much of a shield, when push comes to shove.
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