Carl Sagan

Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an Earth astronomer, astrochemist, and a highly successful popularizer of astronomy, astrophysics, and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI). He was famous for writing popular science books. During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, humanism, and the scientific method.