Quote:
Originally Posted by higginsdj
Yes, but of the billions of star systems with planets in the habitable zone, whats the chance that the first one we come across will be habitable? Beginners luck 
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Not necessarily. If there are billions of them, even if 1/1000 of those is habitable, given the distribution of those planets about the galaxy being random, the chances of one being close by are actually very good.