This is a video talking about how to prevent asteroid from collision to the earth. Most of the asteroid coming to the earth are small and most of them are under 10 meter so they will not cause problem to the earth. I remember out teacher in the school said dinosaurs extinction in because they has little mind. But the reason is the collision of the rock to the earth the surround the earth. But what if a bigger asteroid collision with earth. a rock between 25 to 45 meter might be a city killer. About 45 might be a country killer, bigger than that a continent killer.
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