The SETI project (Search for Extraterrestrial Intelligence) is a research program that searches for intelligent life on other planets, using the assumptions that (a) intelligent life has probably evolved elsewhere in the universe, and (b) it should be detectable by scanning regions of the sky for anomalous radio signals. A fundamental uncertainty in this endeavor is the probability that any life at all will evolve on a planet, and if so, whether it will develop a civilization that uses radio waves. On Earth, how soon after Earth became habitable did life appear? How long did it take until eukaryotes appeared? How long until intelligent life appeared? The use of radio waves? In your opinion, do the answers indicate that the evolution of life (of any kind) on other Earth-like planets is probable or improbable? How about the evolution of intelligent life? How about advanced civilization and radio communications?
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