650-foot asteroid dashing towards Earth! NASA tracks this monstrous space rock
Despite asteroids passing Earth closely almost every day, none so far have threatened our safety on Earth. But there isn't any guarantee against any space rock striking Earth. How big an asteroid would have to be to end all life? Well, NASA says that an asteroid with a diameter of around 96 kilometers (about half the distance from Washington, D.C. to New York City) can actually completely extinguish life on Earth, but smaller asteroids can still cause regional harm.Although not quite as big, NASA has revealed that a…