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The Universe at Your Fingertips 2.0 DVD from the Astronomical Society of the Pacific is in our online store, filled with Earth and space science resources.
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 is a leading figure in the search for extraterrestrial intelligence. He studied the possibility of life on Titan, Saturn's largest moon, whose atmosphere has similar chemistry to that of Earth. Sagan has also played a prominent role in the U.S. space program, with his involvement in the Mariner, Viking, and Voyager spacecraft expeditions. He has made valuable contributions to our understanding of planetary atmospheres and planetary surfaces.

Sagan passed away on December 20, 1996.


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Our online store includes fun classroom activities for you and your students. Issues of NESTA's quarterly journal, The Earth Scientist are also full of classroom activities on different topics in Earth and space science!

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The Origin of Life on Earth

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The Atmosphere of Titan

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Scientists Who Studied Life

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Richard Feynman

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Stephen Jay Gould

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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

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF