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until matter and energy breakdown to the basic particle and the universes temperature reaches absolute zero, does time stop?
First, the speed of light is NOT constant. It varies according to the medium through which it travels. The maximum speed of light seems to be its speed through a vacuum. However, pass it through a prism and its speed slows a bit according to wave length. Hence the spectrum. Bose Einstein condensate is not a vacuum. It is simply an extreme form of 'medium'. As for entropy I am a bit baffled myself. However, it seems to be an isolated phenomena of thermodynamics in a closed system. Specifically, 'It determines that thermal energy always flows spontaneously from regions of higher temperature to regions of lower temperature, in the form of heat.' http://en.wikipedia.org/wiki/EntropyThis clearly is not what happens when gravity collapses a cloud of hydrogen into a star. Gravity compresses the cloud increasing its temperature until the ultimate exothermic reaction takes place: nuclear fusion.If space continues to expand at an ever increasing state, then it could eventually become more powerful then gravity and the whole thing moves towards absolute zero. I suppose this could even overcome the strong nuclear force. If so, the universe might conceivably be reduced to no matter at all. For instance, if spacial expansion can overcome the strong nuclear force, then it seems logical the resultant quarks could also be 'evaporated' into to electromagnetic radiation.I have seen no speculation on whether spacial expansion could also evaporate photons.