Of course, there must be a reason for existence, and perhaps black holes do not break the physical rules of the universe, but they are contrary to the physical rules we recognize in the outside world.

The black hole is so strange that the general laws of physics have collapsed in the case of space and time being completely reversed, and it has become a special spectacle in the universe - under extreme conditions, the physical rules we know no longer apply, and inside the black hole, there is another form of rule.

This raises the question: since the radius of a black hole is the time axis, and space has become an abstract concept like "time", how big is the inside of a black hole? Standing on the outside of a black hole, we have a general understanding of it on the scale of space on the outside, but if we stand inside it, is it infinite?

Because the rules are different, it is entirely possible that the inside of a black hole is another world. Many scientists believe that black holes are a conduit to the "new world", but it cannot be said that it is absolutely wrong.

The key question is whether to simply define a black hole as a special star that even photons cannot escape, or whether to think of it as an extreme environment in the universe that allows the rules of physics to collapse. Because of different understandings, the results obtained are completely different.

If it is a special star, then in the final analysis it is still a star, essentially no different from other planets, stars and other stars, the reason why it is called a "black hole" is nothing more than that the gravitational pull of this star is so large that even photons cannot escape, we can't see it, "black", so it is called a "black hole".

But if a black hole is an extreme environment where "the rules of physics in common sense" completely collapse, then is it still a star? But internally, it has completely deprived us of the ability to define it!

The two are completely different understandings!

This shift in thinking actually makes sense of the concept of a long river of time, and Su Yuan found that most of the topics she discussed with rootless duckweed were philosophical issues. However, the application has to involve reality.

What is philosophy, philosophy is the river of time, like a set mechanism. Once the trigger condition is reached, it will help the traveler complete the "obliteration-collapse" of the world, reducing the entropy and jumping on the timeline to complete the worldline.

The reality, on the other hand, is that pragmatic scientists are entangled in topics that can never be bypassed: where do you get such a huge amount of energy from when you need energy to reduce entropy? Because you can't find a way to get a huge amount of energy in reality, you can't turn back time!

Su Yuan remembered that Gao Jun and Xia Linfeng had introduced her to several time machine ideas, but in the end, they were all torn apart by objective reality - to turn back the time of the entire universe, the energy needed was enough to create a new universe!

Even the most likely cosmic string theory. It thinks that circumnavigating the cosmic strings with extremely strong gravitational pull is enough to create space-time tunnels, but the problem is that when two cosmic strings come close together at high speed, black holes may be created, and the mass required to go back to a year ago is equivalent to half the mass of the Milky Way.

Unrealizable! Several ideas are unrealizable, and reality rejects the existence of a time machine!

However, is it really impossible to build a time machine that jumps the world line?

If it can't be manufactured, then where did the time machine that Su Yuan was riding come from? How did the rootless duckweed return to the current era from the future?

What scientists denied, thinking that the time machine that could not be made in reality, actually appeared. The conclusion is obvious. It is the scientist's thinking that has a problem, or rather, a problem with thinking that relies solely on reality.

It's like acknowledging that black holes are areas where physical rules collapse, not just stars. It is impossible to measure the distortion laws inside a black hole with common sense outside the black hole. The reality we see with our naked eyes is not necessarily the whole of reality, and the parts that cannot be seen can only be explained through scientific hypotheses or philosophy.

Now Su Yuan already knows that there is a "fruit" of time machine. What she needs to look for is the "cause" that caused this "effect". It doesn't matter what the "cause" is, it certainly exists anyway. Turn back the clock. If the entropy of the entire universe decreases, then there must be a "cause" that provides it with energy to complete this "effect".

The concept of the long river of time is a reasonable explanation.

Although she and the rootless duckweed could not give an exact definition of the long river of time. He didn't know how it existed, but Su Yuan believed that the maker of the time machine must have a full understanding of it. At this moment, she suddenly became in awe of this person, how amazing this person must be!

……

"Rootless duckweed, can I ask you a question?" Su Yuan's thinking turned around and said towards the rootless duckweed.

"What's the problem?"

"Have you ever been in the habit of keeping a diary, have you ever written a diary before that records what is going to happen in the future? Not...... Of course, this diary may be in the past tense, and the present time has exceeded what is recorded in the diary. ”

After typing these tentative texts, Su Yuan quietly waited for a reply.

The rootless duckweed didn't let her wait long, and came over with a smile, "You are also a traverser, so have you recorded the future?"

Belch...... Su Yuan was stunned, "Don't say it, I did use the notebook to write down what was going to happen in the future, for fear that I ......would forget it in the future."

"That's right, the human brain is not a computer, and it is impossible to remember everything. Rootless duckweed replied.

"I did write a diary before, but I lost it, and now I feel a little scared when I think about it. Really...... The diary lacks security, and if I knew it would be lost, I wouldn't have written it down in the notebook. ”

Su Yuan's breathing suddenly accelerated, and she could finally be sure that this rootless duckweed was the owner of the diary!

"So, can you tell me how you came from here?" Because of his excitement, Su Yuan made several mistakes when he typed on the keyboard, and finally sent a sentence out.

"Of course I came by time machine. ”

Rootless duckweed with a smug expression.

Su Yuan immediately wanted to ask her, "Where is the time machine now?" but thinking about it, this question was too abrupt and very inappropriate. If it were him, he would definitely not tell the location of the time machine to another time-traveler. Since it is in vain, it is a vain question. Why risk making rootless duckweed wary of your own fun.

"What about you?" asked the rootless duckweed.

"I also came back on a time machine, but I don't know much about the time machine I was on. It's also confusing when it comes to operation. ”

The rootless duckweed made another embarrassed expression: "The time machine must not be operated indiscriminately, what if it is lost in the long river of time? According to the theory of the long river of time, there are a large number of healthy and unsound universes in the long river of time. If you get lost in the sound universe, it's still good, it's just that you haven't reached the point in time you want to cross, but if you get lost in the unsound universe, you are very likely to perish with that big universe!"

Su Yuan let out an "ah", and now that he thinks about it, it seems that there is indeed such a risk. At that time, I was really ignorant and fearless, and my luck was too good.

"Besides, if you don't know about time machines, you must not know that time machines also have the function of choosing landing sites, right?" said Rootless Duckweed.

"And where to land?"

"Of course, if you can't choose a location, what if you travel to a densely populated place, then let alone change history, it's good not to be put under house arrest by those in power. ”

Su Yuan nodded sincerely, so it was so important to choose the landing site freely. This feature is probably standard on all time machines!

"Take my time machine, for example, so as not to be in a densely populated place. The geographical maps of various periods in the past were loaded in advance, but this was still not safe, so the landing place was generally selected in the deep mountains and old forests. ”

The place where I landed was deep in the mountains and old forests, although the way I landed was not elegant. But luck was good. Neither lost in the long river of time, nor did she appear in a densely populated place, Su Yuan found that her luck was actually so good.

"I think you must be from a further future than I am. My time machine was obtained by chance, and frankly...... I didn't have the ability to make a time machine in my time. Su Yuan decided to confess some truths.

Rootless duckweed seems to have anticipated such a situation. "Understandable, as far as I know. No one had the ability to build a time machine before my time machine. In my time, the time machine was just getting started. ”

"And how many people in your time had the ability to build time machines?"

Su Yuan suddenly became nervous, if the time machine had become a big road commodity in the era of rootless duckweed, then there were too many uncertain factors.

"Do you have the ability to make a time machine? No, no one has, although my time machine was indeed made at that time, but objectively speaking, it was not possible to make a time machine at that time, and I think that even in the more distant future, it is impossible for someone else to make a time machine. ”

Su Yuan's brows furrowed, what did the words of rootless duckweed mean?

Isn't it a contradiction that if a time machine was built at that time, why did it say that the era did not have the ability to make a time machine? Isn't it even a contradiction that even in the more distant future, there will be no one who made the time machine?

"Isn't it confusing? Actually, it's not strange at all, or because of the problem of thinking, not everyone will think of the ethereal river of time, even if they think of a concept similar to the long river of time, not everyone will think that the long river of time can act as an accomplice to jump the world line, and then take a step back, even if they think that the long river of time can act as an accomplice, the question arises again, how many people can reach the level of being recognized as a danger factor m by the long river of time?"

The conditions of this ring after ring, each of which is a huge step, are all small probabilities, and there are too many uncertainties in between.

Su Yuan was speechless, if he wanted to become a danger factor M recognized by the long river of time, the conditions were too harsh. Not to mention the need to unify the four basic forces of gravity, force, weakness, and electromagnetism, and establish a unified theory, in addition to finding the Higgs boson, in order to understand the relationship between mass and space.

This is not the end, since we want to achieve the purpose of jumping time through the means of space, we must also achieve the degree of proficiency in space.

Thousands of years, tens of thousands of years, may not be able to reach.

At that time, did the civilization that pursued this direction still exist? (To be continued......