Carl Sagan on The Tonight Show with Johnny Carson (full interview, March 2nd 1978)
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Carl Sagan - Cosmos - Eratosthenes
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Carl Sagan’s Best Arguments Of All Time - The Best Documentary Ever
American astronomer and exobiologist Carl Sagan is most known from his many appearances in popular science TV shows and his books for a general audience. He researched the climate of the planets and moons in the Solar System, speculated about nuclear winter on Earth and extra-terrestrial life and intelligence. Sagan also worked for on Mariner, Viking, and Voyager probes.