The law of entropy increase was called the first law by Einstein. It is a thermodynamic law put forward by Clausius, who introduced the concept of entropy to describe the irreversible process, that is, the flow of heat from a high-temperature object to a low-temperature object is irreversible. Clausius once published a paper on thermodynamics and defined the basic concept of the second law of thermodynamics for the first time. In 1865, he also proposed the concept of entropy. Clausius proved that in any isolated system, the entropy of the system will never decrease, or that the spontaneous process of nature is in the direction of entropy increase, which is the principle of entropy increase.
It is precisely because of the law of entropy increase that things in the universe are dying out. Humans will age and die; Stars will "die" because of the exhaustion of fuel and become white dwarfs, neutron stars or black holes; This planet will be swallowed up by the red giant that becomes when the star's life ends; Even black holes will continue to evaporate until they finally explode and die.
The most desperate thing is that according to the law of entropy increase, our universe is bound to die. Everything in the universe can't escape the "corrosion" of entropy increase in the end. Everything in the universe will decay with time, and even the sun will run out of energy and go to destruction in the future. For example, the earth, it is precisely because the sun provides great energy to the earth that life on the earth can exist. Once the sun loses its light, this vibrant earth has only one ending: becoming a dead planet without any living things.
The law of entropy increase is also called the most desperate law by some scientists. If everything will eventually disappear, what is the meaning of our existence? But later, scientists discovered through simulation that it is possible to return to the same state in a disordered system. In other words, we may reappear in the new universe after countless years of disappearance.