Find sager bios3/9/2023 Initially an associate professor at Harvard, Sagan later moved to Cornell where he would spend the majority of his career as the David Duncan Professor of Astronomy and Space Sciences. He testified to the US Congress in 1985 that the greenhouse effect will change the earth's climate system. Sagan argued the hypothesis, accepted since, that the high surface temperatures of Venus can be attributed to, and calculated using, the greenhouse effect. Sagan assembled the first physical messages sent into space, the Pioneer plaque and the Voyager Golden Record, universal messages that could potentially be understood by any extraterrestrial intelligence that might find them. His best known scientific contribution is research on extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by radiation. Carl Edward Sagan ( / ˈ s eɪ ɡ ən/ SAY-gən November 9, 1934 – December 20, 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator.
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