If the world was burnt to a crisp by a astroid greater than all the nukes in the world. Then the dinosaurs and everything died and nothing could have survived. And astroid this big would also leave a BIG hole somewhere on the earth...there is none. Furthmore, since there is no evidence that the dino-bones weren't burnt to the crisp, then i'd say evolution is in big trouble. Acid rain would have also contaminated the waters and atmosphere, thus, throwing off carbon dating... The big bang?? Eternal universe??? Think about it...