Photograph of Carl Sagan
Robert Reichert and Cornell University.
Carl Sagan is an American astronomer who was born in 1934.
He is famous for his research on the origins of life and his belief that
life exists elsewhere in the universe.
Sagan became a leading figure in the search for extraterrestrial
intelligence with his involvement in the Mariner, Viking, and Voyager
spacecraft expeditions to Venus and the outer
planets. He has made valuable
contributions to the study of planetary atmospheres, planetary surfaces, and the
history of Earth.
Sagan passed away on December 20, 1996.
You might also be interested in:
How did life evolve on Earth? The answer to this question can help us understand our past and prepare for our future. Although evolution provides credible and reliable answers, polls show that many people turn away from science, seeking other explanations with which they are more comfortable....more
How did life begin on Earth? Though no one is ever likely to know the whole story, virtually everyone has wondered at one time or another, how life on Earth began. There are at least three types of hypotheses...more
Where might we find extraterrestrial life in the solar system, and in what ways might an habitable place be different from Earth? Warmth? It seems that the temperature on Earth (room temperature, so to...more
Carl Sagan Stephen J. Gould Marie Curie Charles Darwin Louis Pasteur Leonardo Da Vinci ...more
Richard Feynman was an American physicist who lived between 1918-1988. He contributed to many areas of physics, including atomic theory and quantum electrodynamics, which studies electron behavior. Following...more
Stephen Jay Gould was an American paleontologist who was born in 1941. He revised Darwin's theory of evolution, introducing his own concept of punctuated equilibrium. This states that evolution is not...more
Evelyn Granville is an American mathematician who was born in 1924. She was one of the first black women in the United States to receive a Ph.D. in mathematics. She has made many contributions to NASA's...more
Stephen Hawking is an English ...more