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The 13 biggest asteroids to ever hit planet Earth

While Earth was famously hit by a meteor that killed off the dinosaurs, many others have also hit our planet, many of them ...
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What Would Happen If Asteroid 2012 DA14 Hit Earth?

YAHOO.COM - There is absolutely no chance that asteroid 2012 DA14 will hit Earth when it makes its closest approach on Friday (Feb. 15), but many other asteroids like it have made a crash landing on ...