After this message, no more messages from the Torol civilization were delivered, and the message of the Torol civilization ended here.

This news shocked Xiao Yu.

"Ten years, only ten years...... The principle of entropy increase, heat death? Xiao Yu thought quickly, and these words quickly flashed in his mind.

Xiao Yu clearly knows what the entropy increase principle is, and also knows the huge impact of the entropy increase principle on this universe. It can be said that it is precisely because of the principle of entropy increase that time will not turn back, and the universe has been shaped into what it is now.

Entropy, a measure of the degree of chaos in the distribution of matter within a system, was born from the second law of thermodynamics. The concept of entropy can be illustrated by a simple example. Everything in the universe has its own entropy value, a teacup has its own entropy value, a pen has its own entropy value, and even a computer, a human being, has its own entropy value.

The entropy value is divided into large and small, and a newly built haode house has a very low entropy value because it is very neat and orderly. A dilapidated house that has not been cleaned for a long time and is full of dust has a higher entropy than a new house.

Entropy is such a thing, the entropy of a broken cup is higher than that of an intact cup, the entropy of a broken computer is higher than that of a new computer, and the entropy of a decaying corpse is higher than that of a living person. In short, the more dilapidated and chaotic the structure of a thing, the higher its entropy will be.

In a self-contained system, entropy can only increase, not decrease. So a broken cup will not become a good cup, a broken computer will not become a new one, a dead person will not become a living person, and time cannot be turned back.

Of course. A broken cup can be repaired and re-improved, and a broken computer repair will not be inferior to a new computer, and even, if you master the cloning jishu, you can also clone a living person from a corpse, but one thing to note is that the concept of entropy is for an independent system. Now that it has been patched and there is an external liliang intervention, it is no longer a stand-alone system.

It can be seen from the principle of entropy increase. If you don't clean a room, it will only get dirtier and dirtier, and it can't happen that if you don't clean it, it will get cleaner and cleaner. Think of a house as a stand-alone system. In the absence of gravity, external energy, external organisms, and so on all external conditions, as time passes. The house can only get more and more chaotic. The ash on its walls will fall off, the house will collapse, and eventually, all the matter that makes up the house will walk evenly within the system, and its entropy will reach its highest level.

This is the principle of entropy increase. Like our universe. It is an independent system, so the end of the universe will inevitably be a heat death, after countless years. There will be no stars in the universe, all stars, planets, comets, white dwarfs, neutron stars, and even black holes will all disappear, and the universe will be filled with infinite leptons and photons.

This is the inevitable outcome of an independent system.

"The principle of entropy increase? Will this little universe dissipate? In Xiao Yu's heart, there was a faint feeling of unhappiness.

"According to the Torol civilization, this small universe will die within ten years...... All the matter inside it, all of it's gone. Could it be that the rate of entropy increase is still related to the size of the universe? Because the large universe is too large, the entropy increases more slowly, and because the small universe is too small and unstable, the entropy increases very quickly, reaching the highest entropy within ten years? ”

Xiao Yu began to worry in his heart, because Xiao Yu also thought of another possibility.

That is, time.

"I don't know if the time of this small universe is synchronized with the big universe, I have been here for almost a year, and I don't know how long time has passed in the real big universe. Since the entropy in this small universe increases rapidly, does it mean that time passes faster than in the larger universe? If I stay here for a year, a million years have passed in the universe, and that's bad, a million years is enough time for the Sweeper civilization to recover, and enough time for the Guardian civilization to repair their flagship. At that time, the Milky Way did not know what would become of it. Let's hope nothing like this happens......" Xiao Yu prayed silently in his heart.

The concern about this matter even overpowered the curiosity about space weapons for the time being.

"We have to hurry." Xiao Yu thought silently, and quickly transferred the space weapon Jishu that the Torol civilization had taught him into his mind and began to watch.

Finally got the most important one of the inheritance of the Torol civilization, Xiao Yu's heart, but there was no excitement in his heart. If you have a life to take it, you have to have a life to enjoy it. Xiao Yu doesn't think that with his current technology, he can resist such things as entropy increase and heat death.

"Judging from the history of the Torol civilization, this small universe has existed for at least more than 500,000 years, so there is no reason for it to die in this short period of ten years after maintaining a stable stability for 500,000 years. There is only one explanation, in the past 500,000 years, the programs left by the Torol civilization must have been constantly drawing energy from the large universe, relying on liliang from the outside to prevent the continuous weakening of this small universe system. ”

In this way, perhaps the entrance galaxy of this small universe is so empty can also be explained. All the material in this galaxy, except for the star that is too big to touch, the rest of the planets, comets, asteroids and the like should have been brought into this small universe by the Torol civilization and turned into energy. Xiao Yu thought secretly.

"If that's ......" Xiao Yu suddenly had another thought in his heart.

In fact, according to the laws of physics, time is not irreversible. Time is just a virtual concept, it is a value to measure the movement of matter, when a person walks from the door of the house to the school, he spends five minutes, if the person goes from the school to the door of the house, back to the original point, then can it be considered that the time has gone back five minutes?

This example is somewhat imprecise, after all, our shijie, in addition to this person, there are many other substances, there is the wind blowing, there are cars moving. So to simplify this example a little more, if there is only one elementary particle in the universe, assuming that this elementary particle itself will not change in any way, and there is no matter in the universe except this elementary particle, and this particle travels from A to B for five minutes, and then it returns from A to B, and everything returns to the original point, then does time go back five minutes?

Some people may say that time has not been turned back, time has passed. But after this elementary particle returns to its original point, everything in this universe is exactly the same as it was five minutes ago, so can't Weishenme say that time has been turned back?

This example is a bit extreme, and of course this does not happen in real Shijie. However, even in the real universe, there are still ways to turn back time. At this moment, Xiao Yu thought of such a way. Of course, whether it can be achieved or not is another matter.

Although the principle of entropy increase states that independent systems are irreversible in time, none of us can be sure that our universe is unique. Maybe there will really be the rest of the universe, and in the rest of the universe, there may also be a lot of matter, a lot of energy. If one day, we can get energy from the rest of the universe to subsidize our universe, then the entropy of our universe may decrease, and when the entropy decreases, time may be reversed. It's as if the intervention of human Liliang will restore the room from dirty to tidy, and the intervention of human Liliang will restore the broken cup to good condition.

"A civilization that can do this must already be a god-like existence, and a sixth-level civilization should not be considered. If...... I mean, if one day I can reach this level, it is not impossible to set this universe in order, return everything to the original point, and return the earth to the age of mankind. Xiao Yu thought secretly, "This kind of ability can definitely be the ability of a civilization of level seven or above, a time rewind, a logical weapon...... I don't know what the mystery of the seventh-level civilization is. ”

Time rewind and logic weapons, these are the two abilities that Xiao Yu speculated that a civilization of level 7 or above might have.

Shaking his head secretly, throwing this chaotic thought out of his mind, Xiao Yu continued to study this information carefully.

The result made Xiao Yu a little disappointed. Originally, Xiao Yu thought that he could peek into the mysteries of sixth-level civilization space technology from this jishu document, and pave the way for himself to step into a sixth-level civilization, but now Xiao Yu found that he didn't want to think about it.

Because this jishu document is of the same nature as the ghost detector that Xiao Yu once obtained, it only explains the method of manufacturing and use, and its application principle, jishu details, scientific and technological theories, etc., are all not. In other words, with this jishu document, Xiao Yu can create a space weapon, and he can use a space weapon, but there is no way to make even the slightest slight change to this space weapon. Because Xiao Yu didn't know the manufacturing principle of space weapons.

"People, you can't be too greedy, it's enough to have this kind of weapon, and its principle might as well be studied in detail later." Xiao Yu thought secretly, dispelled the unhappiness in his heart, and began to follow the guidance of the Jishu document to create the first sixth-level civilization weapon he owned, and cut the space. (To be continued......)

PS: Merry Christmas to all!