There Is no actual proof Earth has ever been hit by an asteroid. I personally think It Is Impossible, because they don't exist and even If they did the Dome Firmament Is an Impenetrable barrier. Tunguska could of been caused from an Alien vehicle from another dimension and the Russian apparent meteors could of been some kind of Russian weapon system. We can't categorically state these are bodies form outer space which I believe to be a fictional construct.