One way or another, it's on everyone's minds, living somewhere in the back of our collective consciousness. Hollywood knows it, and continues to plumb it for box office numbers. The fossil record shouts warnings across millennia about it. Even the dinosaurs developed a particular, albeit brief, loathing for it.
The killer asteroid - the one that we might never even see coming - could end life on this planet and there would be nothing humans could do about it. It creates a kind of helplessness that's difficult to even think about. But simulations show how unleashing Earth's destructive arsenal into deep space could save the planet.
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