"You mean you saw the stars move? How is this possible?"

Yunshan Villa.

When Li Zexuan heard Li Chunfeng say that he saw the stars moving, he frowned subconsciously.

The stars that Li Chunfeng saw should be other stars outside the solar system. The reason why stars are called stars does not mean that stars do not move, but the movement of stars is definitely invisible to the naked eye in a short period of time.

There are no fixed celestial bodies in the universe. All celestial bodies are moving, but at different speeds. Stars not only move, but they also move at high speeds at the speed of the universe. Take the sun, for example, it is moving at about 250 times per second.

It rotates around the center of the Milky Way at a speed of kilometers.

The movement speed of other stars is also very alarming. The reason why stars seem motionless is because they are too far away from us, and we cannot see their movement changes in a short period of time, so they are called stars. Only when they pass by

It may take tens of thousands or even hundreds of thousands of years to clearly see changes in the position of stars.

That's why Li Zexuan didn't believe Li Chunfeng when he said he saw the stars moving!

"It's true! It's true!"

Seeing Li Zexuan's face of disbelief, Li Chunfeng hurriedly explained: "Just when the sky was completely dark, Pindao used a telescope to see a cluster of galaxies around the outline of the sun. This cluster of galaxies was observed by Pindao last year.

The painting is done, but during today’s total solar eclipse, the positions of some stars in the galaxy seem to have changed. Isn’t this just the stars moving?”

"...It's not that the stars are moving, but that the direction of light propagation has changed!"

After listening to this, Li Zexuan quickly recalled some things from his previous life in his mind, and he couldn't help being shocked. Good guy, Li Chunfeng discovered something extraordinary by accident!

In the world he lived in before, Newton stood on the shoulders of giants and saw the falling apple, so he realized the universal gravitation between all things; Einstein stood on the shoulders of his predecessors and proposed the generalized theory of gravity in 1915

Theory of relativity, he believed that gravity is a manifestation of the curvature of space and time.

A major disagreement between Newton's and Einstein's views of space and time concerns the effect of gravity on light.

Although classical dynamics predicts that the gravity of a star can deflect the path of photons, Einstein believed that this prediction is only a rough approximation of the actual situation. It is not the gravity of the star that pulls the photons, but the star bends the structure of space. This is like standing on

Just as the person on the trampoline curves the surface, the photons are like small balls rolling over the trampoline, moving along the curved structure.

From the perspective of a photon, it always travels in a straight line, and the distortion of space-time causes the deflection of the photon. Therefore, gravity is a manifestation of the curvature of space.

Since the sun is the most massive object in our solar system, the resulting curvature of space-time will be the most obvious. But in order to test general relativity, astronomers must study the positions of background stars near the edge of the sun to determine what happens when light passes near the sun.

The deflection angle - the deflection predicted by general relativity is twice as large as that of Newtonian mechanics.

However, the sun is very bright, and it is impossible to see the background stars on the edge of the sun, unless the sun's light is blocked - a total solar eclipse. During a total solar eclipse, the moon moves to the middle of the sun and the earth, just completely blocking the sun's disk.

In 1917, Einstein's "little fanboy" Dyson conceived an experiment to map the positions of background stars near the edge of the sun during a total solar eclipse, and then compare them with the normal positions of these stars in the night sky.

Space-time distortion effect. This experiment was verified in 1919, confirming the correctness of Einstein's general theory of relativity!

Now, Li Chunfeng took advantage of the total solar eclipse to see the stars shift, which proves Einstein's general theory of relativity - massive stars will cause space-time curvature, and light will be deflected when it propagates through it, which is equivalent to passing through

A "gravitational lens" is created, which makes people mistakenly think that the positions of the stars have changed, but in fact, the positions of the stars have not changed.

This Li Chunfeng is completely a scientist who was delayed by metaphysics!

"The direction of light transmission has changed? Lord Hou, I don't understand. Doesn't this light propagate in a straight line? Is it possible that it will also propagate in a bend?"

Li Chunfeng couldn't help but be confused when he heard Li Zexuan muttering in a low voice.

He has been "staying" at Yanhuang Academy for more than half a year. In private, he often communicates with teachers from the physics department such as Mo Huai and Mo Chui. He still understands some basic physics knowledge.

Li Zexuan pondered for a moment and said slowly:

"Daochang Li, under normal circumstances, light does travel along straight lines, but in some special cases, light does not travel along straight lines. For example, when light passes through ice or river water, it will be deflected. This is why fish is used

When spearing a fish, we have to spear the fish where we see it, and then a few inches deeper! Because at that time, the fish we see is not a real fish, it is just an illusion!

"

When Li Chunfeng heard this, he nodded slightly. He had heard these theories from Mo Huai and Mo Chui, and they were not difficult to understand, but...

"Master Hou, I understand what you said, but the light emitted by the stars in the sky only passed through the vast space during the propagation process, and did not pass through ice, water, etc., according to what you said

It is said in the "Physics" textbook that if the refractive index of the propagation medium does not change, then the propagation direction of light will not change. Why do you say that the propagation direction of light has changed?"

Li Chunfeng said with doubts in his eyes.

When Li Zexuan heard this, he couldn't help but secretly thought that Li Chunfeng was quite familiar with the physics of Yanhuang Academy. He smiled and said:

"Daozhang Li, one thing I can tell you clearly is that the stars in the sky cannot be seen moving in a short period of time. Only after tens of thousands or even hundreds of thousands of years can the changes in their positions be clearly seen, so you just

The only explanation for the movement of the stars you see is that when the light from the stars passes near the sun, the propagation path is deflected, as if it has passed through a lens!

As for why this strange phenomenon occurs, this requires the Taoist priest to think about it! However, I can provide a hypothesis for the Taoist priest, that is, the sun, as a star, is far heavier than the earth, and the space near the sun is different from other places.

Depending on the space of the place, the light may be deflected or attracted by the sun when it passes by! The specific reason needs to be considered by the Taoist priest himself!"

As the most famous magic stick in the Tang Dynasty, Li Chunfeng's life was undoubtedly extremely glorious. He even left a very strong mark in the entire history of Chinese civilization. Li Zexuan now just wants to drag Li Chunfeng into the pit of physics.

, I want to see what kind of sparks a metaphysician can create when he collides with physics!

In the 21st century, there is a popular saying that the end of science is metaphysics. When scientists climb to the top of the mountain after all the hard work, the masters of metaphysics have been waiting here for a long time! Einstein once said

: "Religion without science is lame, science without religion is blind", "Space, time and matter are illusions of human understanding".

Metaphysics belongs to the science of interpreting the ontology of the universe. It mainly studies the ontology of Tao, which was initiated, inherited and developed by Fuxi, Huangdi, King Wen, Laozi and Zhuangzi, the ancestors of humanities, that is, Yuanqi ontology. Yuanqi ontology is a cosmology with a strict logical system.

The core value of Chinese civilization. If you look closely, you will see that a certain part of metaphysics actually has a shadow of science.

It is very interesting to think about letting a senior metaphysician study science. Maybe Li Chunfeng will become a scientific master who is more powerful than Newton and Einstein in the future! This is definitely not impossible!

After listening to Li Zexuan's words, Li Chunfeng's face gradually became serious. After being silent for a while, he murmured to himself: "It's incredible that this star can actually change the direction of light propagation!"

He used to boast that he was proficient in metaphysics and could see all the people and things in the world clearly, but now after talking to Li Zexuan, he suddenly felt insignificant. He felt that the knowledge in his mind was like a firefly compared to Li Zexuan.

The light of the sun competed with the bright moon, and for the first time, he had an unfathomable and unfathomable feeling towards Li Zexuan!

Li Zexuan smiled and said: "This is not surprising. The "Physics" currently taught in Yanhuang Academy is only relatively elementary and does not involve the movement of celestial bodies. When the advanced physics is introduced later, students will be introduced to a force - universal gravitation.

.

The heavier the object, the stronger the gravitational force it produces. The weight of a star is even greater. It is difficult for mortals to estimate, and the attraction it produces is stronger! There may be a kind of star with infinite weight and infinite gravity.

, it can swallow everything, maybe even the light around it?"

The thing he mentioned later that can swallow everything is a black hole!

When Li Chunfeng heard this, his expression changed with horror. He said with a horrified look on his face: "If there really is such a star, wouldn't all the people in this world have to experience a catastrophe?"

Li Zexuan shook his head and said: "The birth and death of all things have their own destiny. As a Taoist, how can you not see this clearly! How vast is the universe? How vast are the stars in the sky? Who can say for sure?

There must be no star that can swallow everything as I mentioned. But even if it exists, it may not be near our earth, because the universe is vast and the earth is just a grain of dust in it~! Just based on pure probability

In other words, the chance of us being swallowed up is extremely small!"

"I have lost my temper! What the Marquis said makes sense~!"

Li Chunfeng looked ashamed. He bowed his hand to Li Zexuan and bowed. Then he pondered for a moment and said with a serious face: "Master Marquis, I have an unkind request. I hope you will allow it~!"

Li Zexuan's heart moved, and he quickly said politely: "If you have anything to say, Daoist Master Li, just say it. I will do my best and I will not refuse~!"

"Thank you, Mr. Hou~!"

Li Chunfeng first thanked him, and then said: "Master Hou! I want to stay in Yanhuang Academy. I always feel that your engineering studies, Master Hou, seem to contain the supreme meaning of Taoist metaphysics. If I can understand it thoroughly, I will be able to stay in Yanhuang Academy."

Maybe we can successfully deduce the fate of our country in the next hundreds or even thousands of years of the Tang Dynasty~! This is what I have always wanted in my life~!"

"Push Back Picture"~!

Listening to what Li Chunfeng said, Li Zexuan subconsciously thought of the most wonderful book of Chinese Taoist predictions - "Tui Bei Tu"! Legend has it that it was written by Li Shimin, two famous Taoist priests at the time, Li Chunfeng and Yuan Tiangang, in order to predict the fate of the Tang Dynasty.

.It integrates Yixue, astronomy, poetry, riddles and pictures into one.

Now that Yuan Tiangang has not entered the court, and Li Chunfeng is only in his twenties, naturally no one can write "Tui Bei Diagram". Then when Li Chunfeng is proficient in physics and truly understands the ontology of the universe, how can he deduced "Tui Bei Diagram"

"What will it look like? Li Zexuan himself is looking forward to it very much!

"Although you and I don't learn from the same person, we both come from the Taoist lineage. There is no reason why I should not refuse the Taoist priest's request. However, the knowledge of Yanhuang Academy can only be taught by the students and teachers of Yanhuang Academy."

You know, Taoist Master was able to learn some knowledge about "Physics" from Mr. Mo before, which can be regarded as Mr. Mo and the others violating the academy regulations.

Since a while ago, Yanhuang Academy has begun to fully implement confidentiality management. In the future, no one from Yanhuang Academy will be able to learn the knowledge of Yanhuang Academy! This is my decision, and it is also your Majesty’s decision! And the Taoist priest now works in the Taishi Bureau

, is someone outside Yanhuang Academy. According to confidentiality regulations, you cannot stay in Yanhuang Academy to study engineering~!"

Li Zexuan thought for a moment and shook his head.

It is true that he wanted to drag Li Chunfeng into the "big pit" of physics, but no one can trample on the confidentiality regulations of Yanhuang Academy. In the past, Li Chunfeng could get some physics knowledge from Mo Huai and Mo Chui. That was because at that time

The academy has not fully implemented confidentiality regulations. Now that confidentiality management has begun, it must abide by the confidentiality regulations. If Li Chunfeng wants to stay in the academy, he must first resolve the identity issue~!

Li Chunfeng was silent for a long time, then he cupped his hands and said: "I see, Pindao secretly studied engineering in the academy before, and it was really Meng Lang. I would like to apologize to Mr. Hou~!"

Li Zexuan smiled and said: "You don't have to be like this, Taoist priest. The academy system was not perfect before, so I can't blame you!"

Li Chunfeng's eyes suddenly lit up and he said: "Since only people from the Yanhuang Academy can learn engineering, I wonder if the Marquis is willing to accept Ping Dao as a student? Ping Dao is willing to resign to Your Majesty as a general in the Taishi Bureau~!

"

Li Chunfeng is going to be a student at Yanhuang Academy?

Li Zexuan almost laughed when he heard this! Because Li Chunfeng's son Li Yan studied in Yanhuang Academy! In this way, wouldn't it mean that father and son are in the same academy together?

"It can't be done! It can't be done!"
To be continued...