Astronomer Carl Sagan was an American astronomer, astrophysicist, cosmologist, author, and science communicator. He is best known for his work as a science popularizer and communicator, and he was also a highly regarded astronomer and astrophysicist. He is credited with popularizing the term 'COSMOS' and is remembered for his contributions to the scientific understanding of the universe. Sagan's most famous work was the television series COSMOS: A Personal Voyage, which he wrote and presented. He was also the author of several books, including The Dragons of Eden, Contact, and Pale Blue Dot.