Carl Sagan - The Planets 4: Mars Before Viking

Carl Sagan's 1977 Royal Institution Christmas Lecture. The Royal Institution Christmas Lectures have been held in London annually since 1825. They serve as a forum for presenting complex scientific issues to a general audience in an informative and entertaining manner.

Part 1: The Earth as a Planet
Part 2: The Outer Solar system and Life
Part 3: The History of Mars
Part 5: Mars After Viking
Part 6: Planetary Systems Beyond the Sun

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