Murph is distraught when she finds out that her father will be going into a black hole. Her father explains to her that time is slower in a black hole, so things will be different than what she thought.
Penrose describes his black hole theory, which sparks an idea in Stephen's mind. Stephen reverses Penrose's theory and develops one of his own. Stephen suggests that the universe was born from a black hole exploding. The black hole has such strong space-time singularity that nothing can escape from it, even light. The black hole is triggered by the collapse of a star.