dr Carl sagan discusses the need for
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Carl Edward Sagan (/ˈseɪɡən/; November 9, 1934 – December 20, 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, and science communicator. ... Sagan published more than 600 scientific papers and articles and was author, co-author or editor of more than 20 books.
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