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Carl Edward Sagan (November 9, 1934 - December 20, 1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences

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"Carl Sagan Quotes." Quotes.net. STANDS4 LLC, 2019. Web. 22 Oct. 2019. <https://www.quotes.net/authors/Carl+Sagan+Quotes>.

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