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

One Reply to “Number of Humans Who Have Walked On Another World”

  1. 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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