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The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

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(Will mankind one day without the net expenditure of energy be able to restore the sun to its full youthfulness even after it had died of old age?)

second law of thermodynamics is an expression of the universal law of increasing entropy. In simple terms, it is an expression of the fact that over time, differences in temperature, pressure, and density tend to even out in a physical system which is isolated from the outside world. Entropy is a measure of how far along this evening-out process has progressed.

The most common enunciation of second law of thermodynamics is essentially due to Rudolf Clausius (see above)

(How can the net amount of entropy of the universe be massively decreased? - A question for the collective human consciousness)

Now why is all this here? Well, because of Asimov's The Last Question.

Because there are few things in life, like this short story by Asimov, that make you in an instant grow out of your reality and into a different level of consciousness.

Humanity........