He became a full professor there in 1971. In 1968 he became the director of Cornell University’s Laboratory for Planetary Studies. Some scientists criticized Sagan’s work, arguing that it was unreasonable to use resources for SETI, a fantasy project that was almost certainly doomed to failure. For example, building on earlier work by American chemists Stanley Miller and Harold Urey, he demonstrated that amino acids and nucleic acids-the building blocks of life-could be produced by exposing a mixture of simple chemicals to ultraviolet radiation. During that time he became interested in the possibility of life beyond Earth and the search for extraterrestrial intelligence ( SETI), a controversial research field he did much to advance. His early work focused on the physical conditions of the planets, especially the atmospheres of Venus and Jupiter. From 1960 to 1962 he was a fellow in astronomy at the University of California, Berkeley, and from 1962 to 1968 he worked at Harvard University and the Smithsonian Astrophysical Observatory. Sagan attended the University of Chicago, where he earned a bachelor’s and a master’s degree in physics in 19, respectively, and a doctorate in astronomy and astrophysics in 1960. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.
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