see now i'd have thought that considering the impact velocity of the majority of these objects they would for the most part be able to ecsape the flimsy atmosphere of the moon...
and as for the non escaping debris, i wouldnt ahve thought it would hit with enmough force to create a crater! if it did, i'd expect the crater would be of similar size to the object making it and the said object to more or less be sitting in the middle of it
