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Comet (original title: Comet) is a popular science book written in 1985 by American astronomer, astrophysicist and science communicator Carl Sagan. The book examines the structure, formation, observation and potential effects of comets on humanity. Content and Themes While presenting information in the fields of astronomy and planetary science, the book also discusses the cosmic and historical significance of comets. Major themes include: Structure and Properties of Comets: The physical characte