who was carl sagan ?? .What is Carl Sagan most famous for???
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DescriptionCarl Edward Sagan was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science ...
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Carl Sagan or Carl Edward Sagan was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator in astronomy and other natural sciences. He is best known for his work as a science popularizer and communicator. Wikipedia
Born: 9 November 1934, Brooklyn, New York, United States
Died: 20 December 1996, Fred Hutchinson Cancer Research Center
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