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There's also the mind-boggling physics of the comet striking at just the right angle and force... to keep Earth in a meteor storm for nearly three weeks... and knock The Asteroid towards Earth... during the three weeks Earth moves along its orbit. That part always drove me nuts.
I'm deleting the following item:
This is clearly an example of Space Clouds — and, in fact, it's already listed as an example of that trope. It has nothing to do with asteroids.
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How well does it match the trope?