Carl Edward Sagan (; SAY-gən; November 9, 1934 – December 20, 1996) was an American astronomer, planetary scientist and science communicator. His best known scientific contribution is his research on the possibility of extraterrestrial life, including experimental demonstration of the production of amino acids from basic chemicals by exposure to...
If you wish to make an apple pie from scratch, you must first invent the universe.
—Carl Sagan in Cosmos
Human beings have a demonstrated talent for self-deception when their emotions are stirred.
—Carl Sagan in Cosmos
Proof is the idol before whom the pure mathematician tortures himself.