Carl Sagan, US astronomer

Carl Sagan, US astronomer

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Caption: Carl Edward Sagan (1934-1996), US astronomer and astrochemist. 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, and spoke at the conference of the International Physicians for the Prevention of Nuclear War in Moscow in the summer of 1987. Photographed in 1987, in Moscow, Russia.

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