Number of Humans Who Have Walked On Another World

XKCD makes a cogent point about the number of people who have walked on another world.

xkcd

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The better part is the text associated to the picture : "The universe is probably littered with the one-planet graves of cultures which made the sensible economic decision that there's no good reason to go into space -- each discovered, studied, and remembered by the ones who made the irrational decision."

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