Asteroids have hit the Earth in the past, and the results can be catastrophic. It’s been widely-held that an asteroid strike caused the dinosaurs to die out — but even that isn’t certain, as scientists are beginning to question this once universally-held theory. Since an asteroid hasn’t impacted the Earth in the time we’ve been here, it’s impossible to say how bad it would really be or what effects it would have. That would partially depend on the size of the asteroid.
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