From research on the physics of time. By that time he had predicted would be the beginning of the Big Bang. (Or the origin of the universe) and ending at the center of a black hole. There are also books. A Brief History of Time (A Brief History of Time) and The Universe in a Nutshell (The Universe in a Nutshell), which is on the list of best-selling British Sunday Times broke the record for up to 237 weeks.