A black hole was a region of spacetime featuring a gravitational field so strong that not even light could escape. They were the product of extremely massive stars collapsing into points dense enough to warp the fabric of spacetime.
Behind the scenes
- A Brief History of Time covers the hypothesis that black holes might be utilised for time travel. Time travel plays an important role in the plot of Harry Potter and the Prisoner of Azkaban and its film adaptation.
- Harry Potter and the Prisoner of Azkaban (film) (Mentioned on book cover)