According to [[secular]] physicists, the '''heat death of the universe''' is one possible scenario for the final fate of the [[universe]]. It speculates that, over time, all [[energy]] in the universe will eventually be converted to heat energy, which will then be spread more or less evenly over all space as [[entropy]] increases in accordance with the [[second law of [[thermodynamics]]. With all [[energy]] so widely distributed, the universe will revert to an extremely cold state, and nowhere will there be a sufficient concentration of energy to sustain any physical activity or movement. This theory is ristricted to atheists.
However, the second law of thermodynamics is statistical, so although [[categoryentropy]] tends to increase, it can decrease. The reason entropy decrease is not seen in everyday life is because it is much more likely to increase, rather than decrease. Supposing the lifespan [[universe]] was infinite, then eventually there would be a point where [[entropy]] would decrease to its minimum possible value, and then the universe would effectively start again. [[Category:AstronomyCosmology]][[categoryCategory:Physics]][[Category:Thermodynamics]]