Carl Edward Sagan (November 9, 1934 – December 20, 1996) 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.
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It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.
A celibate clergy is an especially good idea because it tends to suppress any hereditary propensity toward fanaticism.