Remember the movie Armageddon where Earth is nearly destroyed by an asteroid, and Bruce Willis and Ben Affleck use a spaceship to it blow-up? Ever wonder what it would be like if that actually happened?
Well, NASA has created a scenario that "demonstrates what's known as the kinetic impactor technique — striking the asteroid to shift its orbit — to defend against a potential future asteroid impact", says this article in Mashable . To know more, click on the link.