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given the age of our universe, our distance from it's centre, the relative age of our solar system. allow fractional statistical percentages for number of planets supporting life, speed of their development and compatibility of technologies we should be bombarded with radiowaves from alien civilizations, given that we only look at a small percentage of range (3%) evidence overwhelmingly predicts that we would have heard something by now, Occams razor suggests we are definately alone
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