What would happen if our planet was ever to cross paths with a meteor? Well, according to this simulation it would be bad news for everyone and everything. This is a small scene from a Discovery Channel program called "Miracle Planet" which details the scary thought of a 500 km (or 300 miles) wide meteor hitting our planet in our lifetime. The amount of kinetic energy released when it hits would be enough to cause a firestorm powerful enough to vaporize all life on our planet and evaporate all of the Worlds oceans.
After the jump you'll see the same video except without the narration and some music that I think has more "impact" ;) on how powerful an image of a meteor hitting the Earth would be.
YouTube for 1st video - [Link]
YouTube for 2nd video - [Link]