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 befor...
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