Science does not have all the answer for everything.It isa work in progress and always changing with new knowledge,
Let's begin with understanding what Quantum Nothing and Quantum Gravity is in reality how Hawking described it.
Basically Quantum Nothing undlies everything in the boundless universe. at the smallest Quantum scale. The following is another explanation of this world of Quantum Nothing: How Could the Big Bang Arise From Nothing?.
But how did these particles come to exist in the first place? Quantum field theory tells us that even a vacuum, supposedly corresponding to empty spacetime, is full of physical activity in the form of energy fluctuations. These fluctuations can give rise to particles popping out, only to be disappear shortly after. This may sound like a mathematical quirk rather than real physics, but such particles have been spotted in countless experiments.
The spacetime vacuum state is seething with particles constantly being created and destroyed, apparently “out of nothing.” But perhaps all this really tells us is that the quantum vacuum is (despite its name) a something rather than a nothing. The philosopher David Albert has memorably criticized accounts of the Big Bang which promise to get something from nothing in this way.
Suppose we ask: where did spacetime itself arise from? Then we can go on turning the clock yet further back, into the truly ancient “Planck epoch”—a period so early in the universe’s history that our best theories of physics break down. This era occurred only one ten-millionth of a trillionth of a trillionth of a trillionth of a second after the Big Bang. At this point, space and time themselves became subject to quantum fluctuations. Physicists ordinarily work separately with quantum mechanics, which rules the microworld of particles, and with general relativity, which applies on large, cosmic scales. But to truly understand the Planck epoch, we need a complete theory of quantum gravity, merging the two.
How the singularity forms that is the seed of a universe is not entirely known. We can observe Black Holes from with singularities and merge and grow over time One possibility is the black holes in a dead universe merge to form a singularity collapse and expand for a new universe. Something like "Roger Penrose has proposed one intriguing but controversial model for a cyclical universe dubbed “conformal cyclic cosmology.”
Hawking's model evolved from the Penerose model called the Hawking-Penrosemodel.
More to follow.
