According to the optimistic reasoning presented in the text, what relation holds as a rough estimate of the number of technological intelligent civilizations now present in the Milky Way?

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    One such civilization should be in existence within the Milky Way at any given time.
     There will be a gap of approximately 10,000 years between successive different technological civilizations within the galaxy.
     The number of such civilizations at any given time would just be approximately equal to the average lifetime of the technological portion of their civilization measured in years.
     Ten such civilizations should be in existence within the Milky Way at any given time.
     No general rule was derived for estimating the number of such civilizations at any given time.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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The number of such civilizations at any given time would just be approximately equal to the average lifetime of the technological portion of their civilization measured in years.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)



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