Carl Sagan
Carl Edward Sagan (November 9, 1934 - December 20, 1996) was an American astronomer who pioneered exobiology and promoted the Search for Extraterrestrial Intelligence (SETI) and science in general.
He is less well known for his skepticism.
Carl Sagan
Carl Sagan with a model of the Viking Lander. (Click here for larger image)
Photo credit: Jet Propulsion Laboratory, free for non-commercial use.
Born in Brooklyn, New York, Sagan attended the University of Chicago, where he received a bachelor's degree (1955) and a master's degree (1956) in physics, before earning his doctorate (1960) in astronomy and astrophysics. He taught at Harvard University until 1968, when he moved to Cornell University.
Sagan became a full professor at Cornell in 1971 and directed a lab there. He contributed to most of the unmanned space missions that explored our solar system. He conceived the idea of adding an unalterable and universal message on spacecraft destined to leave the solar system, that could be understood by any extraterrestrial intelligence that might find it. The first message that was actually sent out into space was a gold-anodized plaque on board of the space probe Pioneer 10. He continued to refine his designs and the most elaborate such message he helped to develop was the Voyager Golden Record that was sent out with the Voyager space probes.
He was well known as a coauthor of the paper that warned of the dangers of nuclear winter. He also perceived global warming as a growing, man-made danger and likened it to the natural development of Venus into a hot life-hostile planet through greenhouse gases. His interest in these topics was in large part motivated by his interpretation of the Drake equation and the Fermi paradox. He believed that the Drake Equation suggested that a large number of extraterrestrial civilizations would form, but that the lack of evidence of such civilizations suggests that technological civilizations tend to destroy themselves rather quickly. This stimulated his interest in identifying ways that humanity could destroy itself, with the hope of avoiding such destruction and eventually becoming a space-faring species.
He wrote (with Ann Druyan, whom he later married) and narrated the highly popular thirteen part PBS television series Cosmos; he also wrote books to popularize science (The Dragons of Eden (which won a Pulitzer Prize), Broca's Brain, etc.) and a novel, Contact, that was a best-seller and had a film adaptation starring Jodie Foster in 1997. The film won the 1998 Hugo award. From Cosmos Sagan became associated with the catchphrase "billions and billions" which he never actually used in the television series. (He simply often used the word "billions.") Late in his life, Sagan's books developed his skeptical/atheist view of the world, including The Demon-Haunted World: Science as a Candle in the Dark and Billions and Billions: Thoughts on Life and Death at the End of the Millennium, which includes Ann Druyan's account of Sagan's death as a non-believer. He also wrote Pale Blue Dot: A Vision of the Human Future in Space, which was selected as a notable book of 1995 by The New York Times.
He cofounded the Planetary Society, a society created to do major research in radio communication with extraterrestrial life, robotic exploration on Mars, the investigation of asteroids near the Earth.
Sagan caused mixed reactions among other professional scientists. On the one hand, there was general support for his popularization of science, his efforts to increase scientific understanding among the general public, and his positions in favor of skepticism and against pseudoscience. On the other hand, there was some unease that the public would misunderstand some of the personal positions and interests that Sagan took as being part of the scientific consensus rather than his own personal views, and there was some unease, which some believe to have been motivated in part by professional jealousy, that scientific views contrary to those that Sagan took (such as on the severity of nuclear winter) were not being sufficiently presented to the public.
After a long and difficult fight with myelodysplasia, Sagan passed away at the age of 62, on December 20, 1996.
The landing site of the unmanned Mars Pathfinder spacecraft was renamed the Carl Sagan Memorial Station in honor of Dr. Sagan on July 5, 1997.
Related Books and Media
- Sagan, Carl and James Randi. "The Faith Healers". Prometheus Books, May 1989 ISBN 0879755350 318 pgs
- Sagan, Carl, "The Dragons of Eden: Speculations on the Evolution of Human Intelligence". Ballantine Books, December 1989 ISBN 0345346297 288 pgs
- Sagan, Carl, "Broca's Brain: Reflections on the Romance of Science". Ballantine Books, October 1993 ISBN 0345336895 416 pgs
- Sagan, Carl and Ann Druyan, "Shadows of Forgotten Ancestors: A Search for Who We Are". Ballantine Books, October 1993 ISBN 0345384725 528 pgs
- Sagan, Carl and Ann Druyan, "Comet". Ballantine Books, February 1997 ISBN 0345412222 496 pgs
- Sagan, Carl, "Contact". Publisher: Doubleday Books, August 1997 ISBN 1568654243 352 pgs
- Sagan, Carl, "Pale Blue Dot: A Vision of the Human Future in Space" Ballantine Books, September 1997 ISBN 0345376595 384 pgs
- Sagan, Carl and Ann Druyan, "Billions & Billions: Thoughts on Life and Death at the Brink of the Millennium". Ballantine Books, June 1998 ISBN 0345379187 320 pgs
- Sagan, Carl, "The Demon-Haunted World: Science As a Candle in the Dark". Ballantine Books, March 1997 ISBN 0345409469 480 pgs
- Sagan, Carl and Jerome Agel, "Carl Sagan's Cosmic Connection: An Extraterrestrial Perspective". Cambridge University Press, January 15, 2000 ISBN 0521783038 301 pages
- Sagan, Carl, "Cosmos". Random House, May 7, 2002 ISBN 0375508325 384 pgs
- Davidson, Keay. "Carl Sagan : A Life". John Wiley & Sons, August 31, 2000 ISBN 0471395366 560 pgs
External Links
See also : extraterrestrial life