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I still think they low balled the number of civilizations in the galaxy. Part of this is under the bad assumption that the glody locks zone of planetary orbits must be the same as our planet's. Suppose other worlds have life that thrives at 300 degrees below zero or 700 above? They've already found one planet that's so hot iron could exist as vapor and precipitate out of the atmosphere like rain. I was suggest that there are anywhere from 20 to 400 times as many civilizations as the equation suggests, simply based on the chemistry alone.
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"Enough!!" -so rang Barack Obama's voice off the walls of Mile High Stadium
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