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Sagan, Carl Edward(1934-1996), American astronomer and pioneer exobiologist. Sagan was born in New York City and studied at the University of Chicago, where he received a Ph.D. in astrophysics. Sagan's research was directed toward evidence of life in outer space.

He also studied the origins of organisms with the geneticists Hermann J. Muller and Joshua Lederberg. Lederberg and Sagan had a large share in establishing exobiology, the search for extraterrestrial life, as a scientific discipline.

After serving as assistant professor of astronomy at Harvard University and astrophysicist at the Smithsonian Astrophysical Observatory (1962-68), Sagan became director of the Laboratory for Planetary Studies at Cornell University. He has worked on many space-exploration projects. Besides numerous scientific publications, Sagan has written several popular science books including The Dragons of Eden (1977); Broca's Brain (1979); Cosmos (1980), based on the television series of the same name, which he produced; and Comet (1985). He also wrote a novel, Contact (1985).

Carl Sagan died at 62. Astronomer, author looked for what the universe might hold.

Correspondent Norma Quarles NEW YORK (CNN) --

Born in New York City in 1934, Sagan was a noted astronomer whose lifelong passion was searching for intelligent life in the cosmos. "The significance of a finding that there are other beings who share this universe with us would be absolutely phenomenal, it would be an epochal event in human history," Sagan once said. Sagan began researching the origins of life in the 1950s and went on to play a leading role in every major U.S. spacecraft expedition to the planets. "We have looked close-up at dozens of new worlds. Worlds we never saw before. And unless we are so stupid to destroy ourselves, we are going to be moving out to space in the next century," he said. "And if I'm fortunate enough to have played a part in the first preliminary reconnaissance in the solar system, that's a terrifically exciting thing."

"We have swept through all of the planets in the solar system, from Mercury to Neptune, in a historic 20 (to) 30 year age of spacecraft discovery," Sagan once said. Sagan made his mark early with research showing that Venus is scorching hot and Mars is a cold desert. Among his many gifts was the ability to communicate his knowledge about the cosmos. "Are we an exceptionally unlikely accident or is the universe brimming over with intelligence? (It's) a vital question for understanding ourselves and our history," Sagan said. Radio telescopes listening for signs of life in the billions of stars and galaxies, as part of a program close to Sagan's heart, have so far received no response. "It says something about the rarity and preciousness of life on this planet," he said. "The flip side of not finding life on another planet is appreciating life on Earth."

Outside his research, Sagan also hosted a popular television series on PBS called "Cosmos." He published hundreds of scientific papers; wrote eight books, including the Pulitzer Prize winning "The Dragons of Eden"; and was a professor of astronomy at Cornell University in Ithaca, New York. Sagan came close to death twice after being diagnosed with blood disease in 1994. Bone marrow donated by his sister, along with chemotherapy, put his cancer in remission. Speaking at a conference after that episode, he said, "I'd like to begin with a personal remark. I've been in Seattle for the past months, fighting a life-threatening illness which it looks as if I've surmounted." Despite his battle with cancer, Sagan continued his dream of going to the stars. "The job is by no means done," he said. "We will look for the boundary between the solar system and the interstellar medium and then we'll voyage on forever in the dark between the stars.