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By Einstein's definition, time is what clocks measure – but how can we define “clock” without referring to time? This tag is for such philosophical questions about the many unresolved issues concerning time. Though this includes questions about the interpretation of physical theories and concepts, if your question is about what current physics can quantitatively predict or explain, it is probably not about philosophy and therefore off-topic.

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The time affect everything that changes. In fact, without any change, there's no way to say how fast (or even if) the time flows. It's more like the concept of time-and-space in contemporary physics … - the time is the dimention, and we travel in time, therefore we see the world changing, while the mass and energy have other configurations in other points of time. We don't see the time, neither …
answered Oct 5 '12 by FolksLord