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Carl Sagan (1934-1996). Portrait of the US astronomer and astrochemist Carl Edward Sagan infront of an illustration of the universe. Sagan was a consultant and adviser to NASA, and worked on the Apollo mission, as well as the Mariner, Viking, Voyager, and Galileo space probes and planetary exploration programs. He proposed theories to explain the high temperature of Venus, the seasonal changes on Mars, and the reddish haze of Titan. He was a prominent sceptic and populariser of science, writing many books on the subject. He also campaigned for nuclear disarmament.

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