On January 15, 776, in the library of Kiba Star Glory Academy, there was no one in the library at this time, and he seemed very prominent because he was Yuan Fei.

It was not because he was Yuan Fei, but because Yuan Fei was wearing something strange at this time, which was called a mobile therapy warehouse. He was so injured that it was difficult to heal for a while, so he was wearing this thing.

It's white, a bit like a fat robot, and many people praise him for being cute when they see it...

Yuan Fei really wanted to scold people, but he really didn't have the energy now. He had to focus all his energy on reading books and he had to absorb more knowledge.

It should be said that Yuan Fei himself is a good student. He dare not say that the books he has read are vast, but he is worthy of being in a lot of fun. However, at this time, human reading is not limited to paper, and there is no need to use a cow to pull it, nor does it need to use a big house to install it.

So, what book is Yuan Fei reading?

Time, all are books about time!

"Boy, you have read so much, and in the end it can only confirm my statement, that's all." Mr. Cheng's voice has never stopped. It's just that Yuan Fei doesn't like to listen to this old man now.

It has been two days since they returned to Kiba Star, and their relationship is still in a state of almost cold war. Yuan Fei feels that Mr. Cheng is dishonest, and especially Mr. Cheng explains to Yuan Fei why Qi Qingxuan looks like that...

Mr. Cheng said this at that time:

"You don't have to worry about the changes in Yuan Fei and Qi Qingxuan's appearance, because with the current technological means of human beings, as long as she gets the corresponding supplement, she will recover..."

Well, after seeing Qi Qingxuan's aging appearance, Mr. Cheng was very good at speaking. Before explaining the reasons, he comforted Yuan Fei.

"I didn't!" Yuan Fei was a little dishonest in his consciousness.

In fact, it’s not dishonest, just when I think of Zhou Meiyun, Yuan Fei is a little...

"Okay, I'll tell you carefully..." Mr. Cheng then began to talk about his big truth, "I have to say one thing first, that is how time comes..."

"Is this a big deal?" Yuan Fei's attitude towards Mr. Cheng would not be better anyway.

"Of course I have to say it." Mr. Cheng seemed to be unaware of it. "There is no doubt that time does exist. But the problem is that time is defined by humans!"

This... Just this sentence, Yuan Fei stopped interrupting because there was an instant reaction in his mind. This is a very basic but very fresh knowledge.

"We all know that time is moving forward. When we humans see the rise and fall of the sun, we define one day at a time. Ancient humans only use the sun as a reference object. I have told you these before, but have you ever thought that there is a huge limitation?" Mr. Cheng asked.

"What do you mean is because we are on Earth, or on planets like Earth?" Yuan Fei thought for a moment and gave the answer.

"That's right, it's true. The time defined by us humans is limited to the Earth and such planets. Or in a broad sense, it means that our human time is very small, because planets are very small in the universe. To put it bluntly, our human time is nothing more than a "small time". So have you ever thought that if this limitation is broken and the scale of time is enlarged to the level of the universe?"

"you mean……"

After hearing Mr. Cheng's words, Yuan Fei seemed to have thought of something, but he didn't seem to have any. This is really... But this time, Mr. Cheng immediately gave Yuan Fei an answer.

"It was originally something you needed to understand by yourself, but now it's almost done, and we don't have much time left. Yuan Fei, listen well, with our existing knowledge and technological level, we can make this conclusion, that is, if the universe is regarded as a person, the universe's definition of time, that is, the universe's own time, is, there is no time!" Mr. Cheng's words were speechless!

"No time?" Yuan Fei really didn't expect that after a long time, he actually had such an answer, but...

"But there is time again!" Mr. Cheng immediately said this again.

"I want to beat you up, do you know?" Yuan Fei's reaction this time was very direct.

But Mr. Cheng was not a joke. He continued to say very seriously: "The answer is very simple, because from the perspective of the universe, time is space, and space is time!"

This statement...

Yuan Fei only felt that something seemed to burst into his mind!

Yes, time is defined by us humans, so does the universe know?

Moreover, based on Yuan Fei's understanding of the classic physics work and "A Brief History of Time", this book actually wrote such a theory...

Time is generated after the Big Bang. The reason why time keeps moving forward in a positive direction is because of the continuous expansion of the universe. Not only that, time is not only moving forward in a positive direction, including the energy arrows of the universe, and the causal arrows of philosophy are also consistent.

With the emergence of the Big Bang, they are constantly moving forward with the expansion of the universe!

So, if the universe is regarded as a person, what is the difference between time and space in his eyes?

Simply put, that is, the expansion of space leads to the advancement of time, and of course they are one, and even in terms of expression, it is also true that as time progresses, the universe continues to expand.

This inference can only be used as a theory, or as Mr. Hawking said, it is just a prediction, because inference with the current technology of mankind, there is no way to prove it experimentally and cannot be practiced. The universe is too vast. We do not know its specific time scale and spatial scale, so it can only be derived through theoretical deduction.

But obviously, this is a correct prophecy, then...

Yuan Fei had actually thought about why Qi Qingxuan ages!

It's very simple. She jumped over the space, but in fact, she also jumped over the time. Of course she will age!

In this way, the answer is out. In fact, if all the above derivation processes are now viewed in reverse, they are really very simple, and they are all simple logic. However, if you don’t dig deep and think about such a simple thing, Yuan Fei knows that he will not understand it at all.

"Then why haven't we gotten older?" Yuan Fei couldn't help asking.

"You have a good understanding, boy." Mr. Cheng was happy. Of course he understood that Yuan Fei should have figured out the previous truth, which was very good, so Mr. Cheng said: "This is difficult to explain, just like we cannot study the Force thoroughly now. It may be the characteristic of superpower, or because Qi Qingxuan is a space jumper, so the forces of time and space in the universe act on her. Of course, these are all problems that cannot be thoroughly studied at present."

Obviously, although such an answer is not satisfactory, the truth in this world is like this. Humans have too many things that they don’t understand, especially when humans feel that they have understood thoroughly enough, more things that we don’t understand will soon appear. It’s so strange, but this is also one of the driving forces for humans to move forward. We must figure out this universe!

"But..." Yuan Fei suddenly thought of another question, "I almost understand this truth, but just by looking at the previous space jump, Qi Qingxuan jumped from Kiba Star to xn7693, but jumped back from xn7693, then isn't this a reversal of time?"

That’s right, Yuan Fei remembered what Teacher Feng Luan said, that time is irreversible.

Mr. Cheng quickly answered this question, "That is not a reversal. Returning from xn7693 is actually a positive jump. To put it bluntly, the time defined by us humans is moving forward, and this forward point has changed, and the base point has become xn7693. Because of this, the cosmic coordinates currently used are reference objects based on time, energy, and events."

It turns out that there are such reasons for the problem of cosmic coordinates, but Mr. Cheng did not fully reveal all the reasons...

"In other words, Qi Qingxuan is doing extra?" Yuan Fei really realized something else.

"That's right, so this seems to explain why she is the only one who grows old. Of course, this cannot be used as a deterministic theory. We still cannot figure out the real reason why space-based evolutionists grow old." Mr. Cheng's answer at this time was very, very much like a scientist.

Yuan Fei noticed this because it was so strange. Many of what Mr. Cheng said to him before were different from science, or even anti-science, right?

But the topic was not explained, and Mr. Cheng gave Yuan Fei another question. He said, "So, did you think of what the role of events in the coordinates of the universe?"
Chapter completed!