How vulnerable is the Earth to asteroid strikes?

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How vulnerable is the Earth to asteroid strikes?

The meteor that exploded over Chelyabinsk in February was a reminder about of how suddenly asteroids can strike and how deadly they can be. It was also the third major meteor strike in Russia in just over a century. This article examines the real risks of meteor strike and what we can do about it (short of sending Bruce Willis) http://bit.ly/18zJifO

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