Otaku Engineer in Great Tang Dynasty

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

Yunshan Courtyard.

Li Zexuan frowned subconsciously after hearing Li Chunfeng say that he saw the stars moving.

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

There are no celestial bodies in the universe that are constant and immobile. All celestial bodies are moving, but at different speeds. Stars not only move, but move at cosmic speeds. Take the sun, which is orbiting the center of the Milky Way at about 250 kilometers per second.

The speed of other stars is also very impressive. The reason why stars don't move is because they are so far away from us that we cannot see their movement and changes in a short time, so they are called stars. Changes in the positions of stars are only apparent after tens of thousands or even hundreds of thousands of years.

So Li Chunfeng said that Li Zexuan would not believe it when he saw the stars moving!

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

Seeing Li Zexuan's 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 group of galaxies was observed by Pindao last year. The drawing is done, but during today's total solar eclipse, the positions of some stars in that cluster of galaxies seem to have changed, isn't that the stars moving?"

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

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

In the world he lived in before, Newton stood on the shoulders of giants, saw a falling apple, and realized the universal gravitational force between all things; Einstein stood on the shoulders of his predecessors and proposed the generalization in 1915. In the theory of relativity, he believes that gravity is the appearance of the curvature of space-time.

A major disagreement between the Newtonian and Einstein views of spacetime concerns the effect of gravity on light.

Although classical dynamics predicts that the gravitational force of a star can deflect the path of a photon, Einstein believed that this prediction is only a rough approximation of the actual situation. It is not that the gravitational force of the star pulls the photon, but the star bends the structure of space, which is like standing Just as the person on the trampoline curved the surface, the photons were like small balls rolling across the trampoline, moving along the curved structure.

From the photon's point of view, it always travels in a straight line, and the distortion of spacetime causes the photon to be deflected. 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 spacetime will be most pronounced. But to test general relativity, astronomers must study the positions of background stars near the edge of the sun to determine the angle of deflection that occurs when light passes near the sun—a deflection predicted by general relativity that is twice as large as that predicted by Newtonian mechanics.

However, the sun is so bright that it is impossible to see the background stars on the edge of the sun, except by blocking the sun's light - a total solar eclipse. During a total solar eclipse, the Moon travels halfway between the Sun and 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 these stars with their normal positions in the night sky. Space-time warping effect. This experiment, verified in 1919, confirmed the correctness of Einstein's general theory of relativity!

Today, Li Chunfeng took advantage of the total solar eclipse to see the stars shift. Isn't that proving Einstein's general theory of relativity-massive stars can cause space-time curvature, and light propagates in them and will deflect, which is equivalent to After a "gravitational lensing", people mistakenly believe that the position of the stars has changed, but in fact, the positions of the stars have not changed.

This Li Chunfeng is completely a physicist who has been delayed by metaphysics!

"The transmission direction of the light has changed? Lord Hou, Pindao doesn't understand, doesn't this light travel in a straight line? Could it still be curved?"

Li Chunfeng heard Li Zexuan muttering in a low voice, and couldn't help but wonder.

He has been "resident" in Yanhuang Academy for more than half a year. In private, he often communicates with Mo Huai, Mo Chui and other gentlemen in the physics department. He still understands some basic physics knowledge.

Li Zexuan pondered for a moment, then slowly said:

"Daochang Li, under normal circumstances, light does travel in a straight line, but in some special cases, light does not travel in a straight line. For example, when light passes through ice and river water, it will deflect. That's why using fish When we fork the fish, we have to go to the position of the fish we see and fork a few inches further down! Because at that time, the fish we saw was not the real fish, it was just an illusion! "

Hearing this, Li Chunfeng nodded slightly. He had heard of these theories from Mo Huai and Mo Chui, and it was not difficult to understand, but...

"Master Hou, Pindao understands what you said, but the light from the stars on that day only passed through the vast space in the process of spreading, and did not pass through ice cubes, water surfaces, etc. According to the textbook "Physics", if the refractive index of the propagation medium does not change, the propagation direction of light will not change, so why do you say that the propagation direction of light has changed?"

Li Chunfeng looked suspicious.

Li Ze

Xuan Wenyan couldn't help but secretly thought that Li Chunfeng was quite familiar with the physics of Yanhuang Academy. He smiled and said:

"Daochang Li, I can tell you clearly that the stars in the sky cannot move in a short period of time. Only after tens of thousands of years or even hundreds of thousands of years can they clearly see the changes in their positions. That's why you just now The only explanation for the movement of the stars seen is that the light emitted by the stars is deflected when passing near the sun, as if passing through a lens!

As for why this strange phenomenon occurs, this requires the Taoist priest to think about it himself! However, Ben Hou can provide a hypothesis for the Taoist priest, that is, the sun, as a star, weighs far more than the earth. The space near the sun is different from the space in other places. When light passes through, it will be deflected or attracted by the sun. maybe! But this is a conjecture of Ben Hou. 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, and he even left a very strong stroke in the long history of Chinese civilization. Li Zexuan is now trying to pull Li Chunfeng into the pit of physics. , I want to see what kind of sparks a metaphysician can collide with physics!

In the 21st century, there is a popular saying that the end of science is metaphysics. When scientists climbed to the top of the mountain with hard work, the masters of metaphysics (Buddhism) have been waiting here for a long time! Einstein once said: "Religion without science is lame, and science without religion is blind", "Space, time and matter are the illusions of human cognition."

Metaphysics belongs to the knowledge of interpreting the ontology of the universe. It mainly studies the ontology of Dao, which was initiated, inherited and developed by Fuxi, Huangdi, King Wen, Laozi and Zhuangzi, the ancestor of humanities. The ontology of vitality is a cosmology with a rigorous logical system, and it is the core value of Chinese civilization. If you take a closer look, a certain part of metaphysics actually has the shadow of science.

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

After listening to Li Zexuan's words, Li Chunfeng's face gradually became solemn. After a long silence, he muttered to himself, "It's incredible that this star can actually change the direction of light transmission!"

In the past, he boasted that he was proficient in metaphysics and could see everything and everything in the world, but now after talking with Li Zexuan, he suddenly had a feeling of insignificance. He felt that the knowledge in his mind was completely a firefly compared to Li Zexuan. Zhiguang and Haoyue compete for glory. For the first time, he has an unfathomable and unfathomable feeling towards Li Zexuan!

Li Zexuan said with a smile: "This is nothing unbelievable, the "Physics" currently taught by Yanhuang Academy is only relatively elementary, and does not involve the motion of celestial bodies. In the advanced physics that follows, students will be introduced to a force-universal gravitation. .

The heavier the object, the stronger the gravitational force it produces. The weight of the star is even greater. Perhaps there is a kind of star whose weight is infinite and its gravitational force is infinite, and it can swallow everything, even the light around it? "

The thing he said later that can devour everything is a black hole!

When Li Chunfeng heard the words, his color changed, and he said with a look of horror: "If there is such a star, wouldn't all beings in this world experience a catastrophe?"

Li Zexuan shook his head and said: "Everything is born and destroyed, and it has its own destiny. As a Taoist, how can you not even see this clearly? How vast is the universe? How vast are the heavens and stars? Who can say for certain? There must be no star that can devour everything that Ben Hou said? But even if it exists, it is not necessarily near our earth, because the universe is vast, and the earth is just like a speck of dust in it~! It is purely probabilistic In other words, the chance of us being swallowed is very small!"

"Pindao has lost his composure! Lord Hou's words are reasonable~!"

Li Chunfeng was ashamed, he bowed his hands to Li Zexuan, and after a moment of indifference, he said seriously: "Master Hou, Pindao has a ruthless request, and I hope Master Hou will allow it~!"

Li Zexuan's heart moved, and he quickly said politely: "If you have something to say, Daoist Li, Ben Hou will definitely not refuse~!"

"Thank you Hou Ye~!"

Li Chunfeng first thanked him, and then said: "Master Hou! Poor Dao wants to stay in Yanhuang Academy. Poor Dao always feels that your engineering study, Master Hou, seems to contain the supreme meaning of Taoist metaphysics. Maybe I can successfully deduce the national luck of the Tang Dynasty for hundreds or even thousands of years in the future~! This is what the poor Daoist wished for in his life~! Please allow the Lord Hou!"

"Push the back picture" ~!

Hearing Li Chunfeng say this, Li Zexuan subconsciously thought of the first strange book of Chinese Taoist prophecy - "Tui Bei Tu"! Legend has it that it was written by Li Shimin, two famous Taoists Li Chunfeng and Yuan Tiangang, in order to calculate the national fortune of the Tang Dynasty.

Now Yuan Tiangang has not yet entered the court, and Li Chunfeng is only in his twenties. Naturally, no one can write "Tui Bei Tu". If Li Chunfeng is proficient in physics and truly understands the universe, then he will perform "Tui Bei Tu". "What will it look like? Li Zexuan himself is very much looking forward to it!

"Although you and I are not taught by the same person, they both come from the Taoist lineage. There is no reason to refuse the request of the Taoist priest, but the knowledge of Yanhuang Academy can only be influenced by the students and teachers of Yanhuang Academy. You know, the Taoist priest was able to learn some knowledge about "Physics" from Mr. Mo before, and it was already considered that Mr. Mo and the others violated the rules of the academy.

since the previous

Since then, Yanhuang Academy has begun to fully implement confidentiality management. In the future, no one outside Yanhuang Academy will be able to learn the knowledge of Yanhuang Academy! This is the decision of the Marquis, and it is the decision of His Majesty! The Taoist priest is now working in the Taishi Bureau, and he belongs to someone outside the Yanhuang Academy. According to the confidentiality regulations, you cannot stay in the Yanhuang Academy to study engineering~! "

Li Zexuan thought for a moment, then shook his head.

He really wanted to pull Li Chunfeng into the "big pit" of physics, but no one could trample on the confidentiality regulations of Yanhuang Academy. In the past, Li Chunfeng could ask Mo Huai and Mo Chui for some physics knowledge because at that time. The academy has not yet 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 solve the identity problem~!

Li Chunfeng was silent for a while, then cupped his hands and said, "So it is, Pindao stole engineering from the academy before.

Li Zexuan smiled and said, "The Taoist priest doesn't have to be like this. Before, the academy system was not sound, so I can't blame you!"

Li Chunfeng's eyes suddenly lit up and he said, "Since only people from Yanhuang Academy can learn engineering, then I wonder if Lord Hou is willing to accept Pindao as a student? Pindao is willing to resign to His Majesty the post of General Shilang of the Taishi Bureau~! "

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

Hearing this, Li Zexuan almost laughed out loud! Because Li Chunfeng's son Li Yan is studying in Yanhuang Academy! In this way, wouldn't the father and son share the same academy?

"No way! No way!"

After a moment's pause, Li Zexuan said quickly: "The knowledge of the Taoist priest is enough to be a teacher of the academy, how can you be a student? Moreover, the Taoist leader is talented and highly valued by the saints. You can't be a gentleman at the Yanhuang Academy at the same time as the errand of the Taishi Bureau!"

Li Chunfeng was greatly moved, and he cupped his hands and said, "If that's the case, I would like to thank the Marquis! The poor road will return to Chang'an, and enter the palace to report to the Ming Sheng~!"

"Go!"

Li Zexuan's face was calm, but his heart was full of joy. He accidentally pretended to be coercive, and "flickered" the most famous magic stick of the Tang Dynasty to the academy as a teacher. This wave of blood earned!

As for what kind of "chemical reaction" Li Chunfeng can have with engineering, only God knows, but Li Zexuan said he is looking forward to it!

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