We do actually have a theory of someething that might cause it to happen; primordial black holes zipping through space, randomly going through the moon (and con

We do actually have a theory of someething that might cause it to happen; primordial black holes zipping through space, randomly going through the moon (and continuing their way as if nothing happened, because that's how physics would work out). However, it's only a theory and depends on in-flux research on early universe cosmology — and the black hole could equally randomly zip through Earth rather than the moon. Or pass in the space between. Or pass between Earth and the sun. Or… The book AFAIR does point out it "might have been a primordial black hole but they don't know", which matches what the situation would be IRL.