Do not be satisfied with superficial answers. His mentors were the geneticists Hermann Muller and Joshua Lederberg, the geochemist Harold Urey, and the planetary astronomer Gerard Kuiper. He went to the University of Chicago, where he studied biology and physics, and earned his Ph.D. He knew then what he wanted to do with his life, and he prepared himself well. Sagan also learned about a powerful method, called science, that could help him explore such ideas. He understood that if those countless stars are suns, they might have their own planets. The answer-that the stars are suns, only very far away, and the Sun is a star, but close up-opened boundless vistas in his young mind. At age seven, he went to the public library to find out what the stars are. “When you’re in love,” he said, “you want to tell the world.”Ĭarl Sagan (1934–1996) grew up in a working-class family in Brooklyn. To hundreds of millions of people, Sagan communicated his passion for the universe of science. Portrait of Carl Sagan courtesy of Andy Levin/PARADE. Carl Sagan (1934-1996), American planetary astronomer, exobiologist, popular educator, and advocate for science.
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