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View Diary: Who can own the future? (262 comments)

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  •  How long? (2+ / 0-)
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    rodentrancher, bartcopfan

    It comes back to the problem of time...How long are civilizations communicative via radio?  It is quite possible that the radio signals of another civilization swept over earth 200,000 years ago and bathed our planet in radio signals for 65,000 years.  But we couldn't hear them.  135,000 years ago we didn't have radio.  Heck 135 years ago we couldn't have heard them.  

    The probability of us listening while another civilization is transmitting are very small.  Factor in the inverse square law and the chance of hearing a signal and it's very possible that there are 0 civilizations transmitting (that we can hear) while we are listening.  

    Those who cannot remember the past are condemned to repeat it. George Santayana

    by RAST on Sun Jul 14, 2013 at 10:47:18 AM PDT

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