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Old February 21 2014, 10:04 AM   #12
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Re: Why don't they crash?

Place a basketball in L.A. Place another basketball in NYC, then one in Berlin, Shanghai, and Capetown. Now, yank the Earth away and you have a nice scale model of a local cluster of stars (where the LA to NYC one is Earth to Alpha Centauri). Now, take a microscopic sand grain and shoot it in some random trajectory through that. The chances of it hitting one of the basketballs is about the same as the odds of ship hitting a star: effectively zero.
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