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Carl Sagan on the Existence of Extraterrestrials

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Carl Sagan discusses the incomprehensible vastness of the universe, the wonder of our own place in it all, and the science behind understanding the likelihood of the existence of extraterrestrial beings. 
Executive Producer David Gerlach
Director Kirill Yeretsky
Series Producer Amy Drozdowska

Carl Sagan argues that if we were to receive a message from an extraterrestrial civilization, the civilization would have to be far more sophisticated and technologically advanced than our's. What evidence does he use to back this up?

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