Universe's beginning linked to time's emergence from "summary" of The Grand Design by Stephen Hawking,Leonard Mlodinow
According to modern physics, the big bang was not just the birth of the universe, but also the birth of time. Before the big bang, time as we know it did not exist. Time is not separate from space, but is inextricably linked to it. This concept may be difficult to grasp, as time seems to be an independent and absolute concept that marches forward relentlessly. However, the theory of relativity tells us that time is actually a dimension, just like space, and is affected by gravity and motion. As we go back in time towards the moment of the big bang, the universe becomes smaller and smaller until it reaches a point of infinite density and temperature. At this point, known as the singularity, the laws of physics as we know them break down. This singularity marks the beginning of the universe and of time itself. Just as one cannot go further north than the North Pole, one cannot go back in time before the big bang. The concept of time being linked to the beginning of the universe challenges our everyday understanding of time. We are used to thinking of time as a linear progression from the past to the future, with the present moment constantly moving forward. However, in the context of the big bang, time is not just a one-dimensional line, but is intertwined with the three dimensions of space in a four-dimensional fabric known as spacetime. The idea of time emerging with the universe raises profound questions about the nature of existence and the origins of our reality. If time did not exist before the big bang, what was there? What caused the singularity to expand and give rise to the universe we see today? These questions remain at the forefront of scientific inquiry, pushing the boundaries of human understanding and challenging our most fundamental assumptions about the nature of reality.
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