Life on other planets

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Encyclopaedia galactica -- QB44.2 .E63 1980

Beginning with the scrutiny of a notorious UFO incident and the unsubstantiated theories of von Daniken, this episode explores the probable nature of intelligent civilizations in the universe and the means by which contact might be made. Dr. Sagan notes that the "Rosetta Stone" for interstellar communication is likely to involve the laws of physics--shared observations about the universe, such as