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How to prevent a mid-size asteroid from wiping out a city.
The simplest way to do this is to give the asteroid a bump…to knock it off course.
The physics is simple. In billiards, when a moving ball hits a stationary ball it forces the stationary ball to move, and the first ball is usually knocked off its course.
If ball 1 is moving and hits … More “How to prevent a mid-size asteroid from wiping out a city.”