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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

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TED-Ed Best of Web are exceptional, user-created lessons that are carefully selected by volunteer teachers and TED-Ed staff.

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