I am a creationist but I think its unlikely asteroids were propelled up into space. I believe the bible says a third of the stars fell to earth during a cosmic fight between satan the angle Michael. This would be soon after the fall. This explains, if accurate, where the choas we finf in space now comes from. Plus where all the great crators here and on other space bodies come from. The movement during the flood would of destroyed many craters or hidden them. Perhaps many meteors did not actually touch the earth but were destroyed as they entered.
I might speculate that all the devastating meteors is what turned much of the planet into a inhospitalable place and so particular kinds of animals did better then others. Dinos, lizards etc.
Just thought I throw my two sense in.