the heat death of the universe is a theoretical time in the future when the universe is supposed to
Heat death of the universe The heat death of the universe is a plausible ultimate fate of the universe in which the universe has diminished to a state of no thermodynamic free energy and therefore can no longer sustain processes that increase entropy. Heat death does not imply any particular absolute temperature; it only requires that temperature differences or other processes may no longer be exploited to perform work. In the language of physics, this is when the universe reaches thermodynamic equilibrium (maximum entropy).
Scientific theory A scientific theory is an explanation of some aspect of the natural world that can be repeatedly tested, in accordance with the scientific method, by using a predefined protocol of observations and experiments.[1][2] Established scientific theories have withstood rigorous scrutiny and are a comprehensive form of scientific knowledge.[3]