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 scientist in his own right. He is credited with popularizing the term 'COSMOS' and is best known for his work on the television series COSMOS: A Personal Voyage. He was also the author of several books, including The Dragons of Eden, Contact, and Pale Blue Dot. Sagan's research focused on exobiology and the search for extraterrestrial life. He was a strong advocate for the scientific method and was a vocal critic of pseudoscience.