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Originally Posted by fjtorres
Uh-huh.
Makes the whole exercise pretty meaningless, no? 
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Well keep in mind the number I gave was based on Steven's estimate of the rate at which new civilizations are born.
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One thing modern exoplanet research is teaching us is that the development of life-capable planets is looking to be a relatively "recent" development in the universe's evolution. Instead of us being newcomers on the universal stage, we might just be the precursors of things to come.
That should lead to some interesting new stories.
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Well lets keep in mind that a lot of exoplanet research is still mostly speculation. Yes, we are discovering planets at a terrific rate, but our methods are still biased towards detecting big planets in tight orbits around their stars. As for life? Well, that is just a major crap shoot still... at least until we reach the point where we can take spectra of planetary atmosphere.
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Bill