Commons – repozytorium wolnych multimediów
English: Carl Edward Sagan (November 9, 1934 – December 20, 1996) was an American astronomer and science popularizer. He pioneered exobiology and promoted the Search for Extraterrestrial Intelligence (SETI). He is world-famous for his popular science books and the television series Cosmos, which he co-wrote and presented. In his works he frequently advocated the scientific method.