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The Big Freeze (also Big Chill) is a scenario in which the universe becomes too cold to sustain life due to continued expansion and the decay of free energy due to the action of entropy. The Big Freeze is a theory of a possible fate of the universe. The Big Freeze could occur if the universe's geometry is either flat or hyperbolic, as either of those would mean that the universe would expand indefinitely eventually reaching absolute zero (-273.15°C or -459.67°F, also defined as 0 Kelvin or 0 Rankine).