nasa planetary defense coordination office
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Why NASA Will Test Its Asteroid Defence System This October
Image: NASA/JPL-Caltech Sometimes, NASA gets to have a bit of fun — with asteroids. This fall, the agency will have a grand ol’ time with one such object called 2012 TC4, which will whizz past us at a comfortable distance of about 4,200 miles (6,800 kilometers) at its absolute closest. Since the asteroid is pretty…