|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
Carl Edward Sagan (9 November, 1934–20 December, 1996) was an American Muggle astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator in the space and natural sciences. During his lifetime, he published more than six-hundred scientific papers and popular articles and was author, co-author, or editor of more than twenty books.
- Harry Potter and the Prisoner of Azkaban (film) (Mentioned on a book cover)