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Carl Sagan was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science communicator, and science popularizer. He is best known for his contributions to the scientific community and his ability to popularize complex scientific concepts for the general public. Sagan played a crucial role in advancing our understanding of the cosmos and advocating for space exploration. His work on the television series "Cosmos: A Personal Voyage" made him a household name worldwide.