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And here is where it gets very interesting, as just recently we learned that Earth-like planets are indeed very common. Statistically speaking at least 1 in 5 planets around Sun-like stars could potentially support life \cite{Petigura_Howard_Marcy_2013}. And Sun-like stars are extremely common, resulting in about 10 billion habitable planets just in the Galaxy, with the closest possibly "just" 12 light years away.\\   %$n_e \approx$ 0.2  note