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Update: Asteroid 2012 DA14 Flyby

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The extremely close flyby of near-Earth asteroid 2012 DA14 is a warning to the inhabitants of this planet. Although this particular asteroid will safely miss the Earth, its close approach raises two key challenges. First, what about the hundreds of thousands of asteroids just like 2012 DA14 that we have not yet discovered? Second, how will we defend the Earth when one is on a collision course?