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 small—only about 30 to 100…
Source: Gizmodo – Why NASA Will Test its Asteroid Defense System This October