Talking with Neil deGrasse Tyson on his popular Star Talk radio program, Hawking dives into the nitty gritty of what existed before the big bang.
The world-renowned British scientist Stephen Hawking says he knows what happened before the Big Bang and the birth of the universe, the BNR reported.
"The boundary condition of the Universe ... is that it has no boundaries", said Hawking.
Hawking said, 'The density would have been infinite.
Again, that's a tough concept to wrap your head around and physicists say our understanding of the universe and the Big Bang is an evolving concept - so there could be more to learn in time to come.
REUTERS/Lucas Jackson/FilesPhysicist Stephen Hawking sits on stage during an announcement of the Breakthrough Starshot initiative with investor Yuri Milner in New York April 12, 2016.
Put simply, space-time is similar to any curved surface without an end, just like Earth. Hawking argued that before the Big Bang, real ordinary time was replaced by imaginary time and was in a bent form. But, some scientists and theologists questioned that what was there before the Big Bang. However, imaginary time "behaves as a fourth direction of space". "It was always reaching closer to nothing but didn't become nothing", he said.
"We can consider ordinary and real time as starting at the South Pole, which is a smooth point of space-time where the natural laws of physics hold", he explains. "Even the amount of matter in the universe can be different to what it was before the Big Bang, as the Law of Conservation of Matter, will break down at the Big Bang".
It's one of the biggest brainteasers out there: If the Big Bang made all that we think about, what the heck was around before the big bang? Scientists have been trying hard to know the events that have happened after the Big Bang. As per this, the universe started developed around 13.8 billion years after an explosion.
To better understand this theory, Hawking proposes to "rewind" the development of the Universe.
A lot of what we believe is a derivative of the human-centric perception, which might limit the scope of human knowledge of the world.