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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.