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When you think about the size of the sky and the size of the rocks involved, even if a massively sized meteor like the one that killed off the dinosaurs was heading straight for us, we probably wouldn't even get an hour's warning, if that.
Like in 1991 an asteroid missed us by 106,000 miles (in cosmic terms that's like a bullet being shot through your sleeve without touching your arm), and we didn't even see it until it was past us.
The same thing happened a couple of years later, but this one was only 90,000 miles away (and again we didn't see it until it had already missed).
And if an asteroid that big did hit earth, we'd probably all die out. So no point really worrying about it 
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