Heat death of the universe

In physics, the heat death describes the result of the thermal equilibrium of a closed system.

According to the second law of thermodynamics contains a closed system in thermal equilibrium, the highest possible level of entropy. In addition, the entropy can indeed remain in such a system the same or increase, but never decrease. So if all possible processes are completed and the maximum entropy is reached, assumes all macroscopic events in the system inevitably to an end.

Assuming that our universe is a closed system, this means that all life will be extinguished in the universe someday. This is also known as the " heat death of the universe " and led in part to philosophical considerations as proof of the inevitability of doomsday. In the current state of physics is an open question whether the universe as we know it at all is a closed system.