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...
We are like butterflies who flutter for a day and think it's forever.
—Carl Sagan in Cosmos
Imagination will often carry us to worlds that never were. But without it we go nowhere.
—Carl Sagan in Cosmos