"Heat death" is something everyone knows the meaning of.
According to the second law of thermodynamics, as an "isolated" system, the entropy of the Cosmos will increase over time, moving from order to disorder.
When the entropy of the Cosmos reaches its maximum value, all other effective energy in the Cosmos has been completely converted into thermal energy, and the temperature of all matter reaches thermal equilibrium.
This state is called heat death.
In such a Cosmos, there is no longer any energy left to sustain motion or life.
So far, even the most powerful intelligent civilization race in the Cosmos, the Martial Hero Race, has not yet discovered the boundaries of the Cosmos.
Therefore, even in the textbooks of advanced civilized races, the term "heat death" is still a "conjecture," rather than a proven fact.
All of these are not of much significance.
