An anonymous reader writes "The discovery of Kepler-186f last week has dusted off an interesting theory regarding the fate of humanity and the link between that fate and the possibility of life on other planets. Known as the The Great Filter, this theory attempts to answer the Fermi Paradox (why we haven't found other complex life forms anywhere in our vast galaxy) by introducing the idea of an evolutionary bottleneck which would make the emergence of a life form capable of interstellar colonization statistically rare. As scientists gear up to search for life on Kepler-186f, some people are wondering if humanity has already gone through The Great Filter and miraculously survived or if it's still on our horizon and may lead to our extinction."
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