In a sign that we are perhaps elevating Stephen Hawking from physicist to prophet, the famed author of “A Brief History of Time” is now making headlines for claiming he knows exactly what happened before the Big Bang. He explained his theory in an interview with Neil deGrasse Tyson on the latter’s StarTalk TV show airing on the National Geographic Channel this Sunday night.

Hawking explained his theory called the “no-boundary proposal,” which posits that the universe has no boundary at all. It understand it, we must first go back to right before the Big Bang happened, when everything in the universe was compressed into a point the size of a single atom called the singularity.

Hawking says that because of all of time and the laws of physics existed within this single point, events that happened before the Big Bang by the fact itself are not defined because they are totally unmeasurable, and that time essentially began with the Big Bang.

“Events before the Big Bang are simply not defined, because there’s no way one could measure what happened at them,” Hawking wrote in one lecture he gave on the no boundary theory. “Since events before the Big Bang have no observational consequences, one may as well cut them out of the theory, and say that time began at the Big Bang.”