Encyclopedia Galactica

Season 1, Episode 12, Aired

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Are we alone in the cosmos or are there other technological civilizations out there? How can we search for them? How would we "decode" a message from them? Is there real evidence that we've already been visited? Are UFOs real? Dr. Sagan asks and answers such questions as "What is the life span of a planetary civilization?" and "Will we one day hook up with a network of civilizations in the Milky Way galaxy?"moreless
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