Number nine in the series of anthropic 'coincidences' that allow life to exist.
From George Greenstein's THE SYMBIOTIC UNIVERSE "A remarkable feature of the universe is its emptiness. Stars are extraordinarily distant from one another. However, were it not for these vast reaches of empty space, violent collisions between stars would be to frequent as to render the universe uninhabitable. The yet more frequent near-misses would detach planets from orbit about their suns, flinging them off into interstellar space where they would quickly cool to hundreds of degrees below zero."
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