Heat death of the universe Guide, Meaning , Facts, Information and Description
The heat death is a possible final state of the universe, in which it has reached maximum entropy. If the universe lasts for an infinite time, then it will asymptotically approach a state where all energy is evenly distributed.Despite the term "heat death", the temperature of the entire universe would be very close to absolute zero in this scenario. Heat death is however not quite the same as "cold death" or the "Big Freeze" in which the universe simply becomes too cold to sustain life due to continued expansion, though the result is quite similar (see more detailed explanation).
Interestingly, recent work in inflationary cosmology has inverted the heat death notion, suggesting that the early universe was in a thermal equilibrium and thus heat death-like state prior to cosmic expansion. Meanwhile, in an expanding universe, the maximum possible entropy increases far more quickly than the actual entropy with each time increment, pushing the universe continually further away from an equilibrium state despite increasing entropy. Furthermore, the very notion of thermodynamic modeling of the universe has been called into question, since the effects of such factors as gravity and quantum phenomena are very difficult to reconcile with simple thermodynamic models, rendering the utility of such models as predictive systems highly doubtful.
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