NOVA: Meteor Strike
Scientists hunt for debris and clues to the origin and makeup of a meteor that landed in Russia. "Russian Meteor Strike" puts it all together and asks: Is our solar system a deadly celestial shooting gallery ‐ with Earth in the cross‐hairs? What are the chances that another, even more massive asteroid is heading straight for us? Are we just years, months or days away from a total global reboot of civilization, or worse?