This is nothing more than supposition presented as factual, scientific research. The narrator delivers sentences like, "An astroid collision could happen, so it's not a question of if but when." I'm sorry, but the verb "could" implies "if." But, to present this as a definite is utterly irresponsible. This is nothing but worse-case, doomsday scenarios (and that's just what they are hypothetical scenarios) offered as examples of our ultimate demise. It has without a doubt created even much deeper skeptisicm with material from the History Channel.