Ok, we give up. Where's the killer asteroid, how long do we have to stop it, and has anyone called Bruce Willis?
In the unlikely event of a gigantic asteroid threatening mass extinction on our planet, scientists are now confident such a disaster could be averted using nuclear weapons. Researchers running new and sophisticated simulators conclude it would take as little as 5 to 10 kilotons of energy to divert an asteroid. That's a relatively small nuclear weapon.