|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, group, 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.
The Big Bang was the leading scientific model of how the universe was formed. According to this theory, all the matter that would make up the universe was once compressed into an infinitely small point, and suddenly exploded outward.
- Harry Potter and the Prisoner of Azkaban (film) (Mentioned on book cover)