Time may not exist before Big Bang from "summary" of A Brief History of Time by Stephen W. Hawking
According to the theory of general relativity, the universe has not existed forever. Rather, the universe, and time itself, had a beginning in the Big Bang about 15 billion years ago. Before the Big Bang, there was no space or time, as we know it. Time is a concept that is intimately linked with space. In the absence of space, time has no meaning. Thus, asking what happened before the Big Bang may be a meaningless question, just like asking what lies north of the North Pole. In the absence of time before the Big Bang, it becomes difficult to discuss the concept of cause and effect. Cause and effect are concepts that are deeply ingrained in our understanding of the universe. However, without time, these concepts lose their meaning. The concept of cause and effect may only make sense within the framework of time. Therefore, trying to understand what caused the Big Bang may be a futile ex...
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