|"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject 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.
- "Stephen Hawking has earned an international reputation as the most brillaint theoretical physicist since Einstein. Now, in this landmark volume, Professor Hawking shares his blazing intellect with nonscientists everywhere, guiding us expertly to confront the supreme questions of the nature of time and the universe. [...] Cogently explained, passionately revealed, A Brief History of Time is the story of the ultimate quest for knowledge: the ongoing search for the tantalising secrets at the heart of time and space."
- —Excerpt of the back cover blurb[src]
A Brief History of Time: From the Big Bang to Black Holes is a book written by Muggle Stephen Hawking and first published by the Bantam Dell Publishing Group in 1988. It concerns a range of subjects in cosmology including the Big Bang and black holes, as well as the works of Galileo and Newton and modern astrophysics. The book was given positive reviews by such publications as The New York Times and the Chicago Tribune. The introduction was written by Carl Sagan.
Behind the scenes
- The inclusion of this book in the film adaptation of Harry Potter and the Prisoner of Azkaban foreshadows time travel later in the film.