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I think time is a concept of human mind to calculate relation between speed and distance for practical reasons because undivided duration makes it impossible for us to process anything.I don't think time exists outside of human mind. Animals and other beings do not need it.
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There is no hierarchy in nature, only harmony. No chosen people, no chosen race, no soul slavery. My true beloved ones are Black Earth and Eternal Blue Sky
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He did ask for a philosophical/meta-physical explanation that doesn't involve cosmology(which I consider more a philosophy than a science in some areas) so I didn't reveal my thoughts on time, but they generally align with the concept of "arrow of time" and entropy. The system which we call the universe goes from a lower entropic state to a higher entropic state on a macro-scale. It is our perception of the change in entropy which we measure time by. In local-systems with an addition of work, we can even analyze the reverse situation: higher entropy to lower entropy, yet this still gives us a perception of time. Therefore, it is the analysis of change (which we developed analytically as calculus) that defines time, and our brains just do these algorithms intuitively, giving us a measuring device for change, most notably that of the entropy of a system or subsystem.
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I'm not a physicist so I can't go into detail. But astrophysics is almost all theory thoughtPhysicists can trace things back to the big bang because it leaves and 'echo'. And since there isn't anything pre-dating the big bang, all we can say is that nothing existed before it. There's also another theory that says time and space began after the big bang in this universe, but in other universes (another theory: multiple universes) there was a 'big bang' at a different time. It's very complicated for me to understand not being a physicist and even harder to explain.
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Big Bang only explains the origins of our universe, but nowadays most of physicists believe in the Membrane and in the Multiverse theory. Some even try to determine the shape our universe, closed on itself. So time predates the existance of our universe at least it seems.
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Something can't come from nothing. And yes I know there was "nothing before the big bang, no particles, [...]" but but the universe couldn't have started itself. So clearly there was at least a primordial source of creation.
Past, present and future are relative, like bigger, same size, and smaller. But the continuum of earlier and later is time.
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