How Worried Should You Be About a Space Rock Destroying the Earth? - Lifehacker

Sci-fi movies and clickbait headlines probably have you more worked up than you need to be.

Its the stuff of disaster movies and sensational headlines: An asteroid, meteor, or comet is headed toward Earth. Are we doomed? Isnt this what took out the dinosaurs? Will we have enough lead time t… [+5500 chars]

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