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Disclaimer: Totally amateur (ignorant?) comment.

At an atomic/particle level, movement (speed) is related to temperature. If something reached 0 degrees Kelvin, there's no particle movement at all. You could argue that since time is relative to space (as opposed to an independent variable), time would slow down as temperature goes down. If the whole universe is cooling, maybe time is slowing down.

Source info: http://en.wikipedia.org/wiki/Thermodynamic_temperature

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Nice thought, except that temperature is simply a measure of speed. When something is said to be a certain temperature, it is said to be moving at such a speed with a certain amount of kinetic energy. That is why when liquids get "hot" enough, they start emitting gas... which is really just particles that have essentially reached the escape speed of their respective surface tension (roughly speaking).

Which is sort of a backwards way of saying that General Relativity actually talks about the relationship between speed and time, saying the faster an object is going, the slower (in a sense...) it is travelling through time.

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