9. Asteroid Strike

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If you pay much attention to the news at all, you probably hear about those asteroids that buzz by our planet every so often. In fact, there are all kinds of asteroids, comets and other objects that are traversing our solar system on a regular basis. So far we have been quite fortunate that none of the big ones have set their sights on earth, but it’s a very real possibility that causes significant concern among many scientists. An asteroid of sufficient size striking earth could wipe out all life on our planet in very short order.