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khafra comments on Open thread for December 9 - 16, 2013 - Less Wrong
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It changes my epistemic position by a helluva lot more than a factor of 4. If an interstellar civilization arose somewhere in the universe that is now visible, somewhere in a uniform distribution over the last 3.6 billion years, there's much smaller chance we'd currently (or ever) be within their light cone than if they'd developed 13.8 billion years ago.