618 – “The Universe is probably littered with 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.”

–Randall Munroe

Quote Number:  454

Source: Munroe, Randall. “65 Years.” xkcd. Online Here.

Source Notes: Note that to see the quote you must hover over the comic.