Is the biggest danger of an asteroid hitting earth the debris released from the asteroid? Looking at general articles it seems that the global risk arises from the debris released into the atmosphere which would affect climate. What would happen if no debris was released? I mean, if the object that hit earth remained intact. Like in a sci-fi film you have a spaceship that crashes onto earth. If the object is made of a metal strong enough to remain intact, would it still be a global event from the debris generated from the Earth? Or would it just be felt in the locally.