[CatoRenasci]

Didn’t Velikovsky write about something like this 50-75 years ago - and get derided as a crank?

[WHATNEXT?]

You are absolutely correct. I once asked a science professor about Velikovsky's theory and the prof told this lowly student it was ridiculous.

[LibWhacker]

I never read him so I can't say. Wasn't he writing about planets and not asteroids in particular?

I'm not saying planets can't collide (in fact they now think that's how the moon was created), but that was very early in the history of the solar system. I think mainstream scientists believe things have been pretty stable since those early days of the "heavy bombardment," at least when it comes to planets.