Photograph of Carl Sagan
Robert Reichert and Cornell University.

Carl Sagan

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:

Science, Evolution, and Creationism

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

The Origin of Life on Earth

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

Exploratour: NASA's Exploration for Life

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

Scientists Who Studied Life

Carl Sagan Stephen J. Gould Marie Curie Charles Darwin Louis Pasteur Leonardo Da Vinci ...more

Richard Feynman

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

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

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

Stephen Hawking is an English ...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA