His relevance to sf had been evident much earlier than that, however, through his speculations about Life on Other Worlds he was one of the comparatively few scientists to have given serious thought to this question. From the mid-1970s, through books and pre-eminently through his 13-part PBS television documentary series Cosmos ( 1980), which he wrote (together with screenwriters who included Gentry Lee) and presented, Sagan became perhaps the best known of all US scientific popularizers. For twelve years he was editor-in-chief of Icarus, a journal devoted to planetary research. He was co-founder and president of the Planetary Society, a very large space-interest group. Sagan played an active role in the Mars experiments carried out by Mariner 9 in 1971, worked also on the Viking and Voyager projects, and was responsible for placing a message to alien life aboard the interstellar spaceship Pioneer 10 (Jupiter flyby 1973). (1934-1996) US astronomer, planetary scientist and author, professor of astronomy and space sciences and director of the Laboratory for Planetary Studies at Cornell University, and winner of the Pulitzer Prize.
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