Next to hundreds of 155 howitzer shells, Jiayu and Lieutenant Schwarzschild sat on the high-walled copper shells and chatted.

Jiayu fumbled for a long time in his thick woolen coat and found a delicate sterling silver wine jug. This is what he saw on the lieutenant colonel's table when he was scurrying around the camp, and sneaked away without anyone noticing.

Jiayu doesn't understand wine, but Schwarzschild is a true gentleman.

I opened the small bottle cap and gently smelled the fragrant and mellow scent, reminiscing about the leisurely life of the past.

"1883, the best whiskey! Lieutenant Hans, this good wine, I heard that only Lieutenant Colonel Heinrich of the Guards Regiment has a little stock......"

Jiayu touched the funny mustache and smiled honestly, "You know ......"

There is very little wine, you take a sip, I take a sip, and the two of them quickly get drunk.

Carl Schwarzschild, who had drunk too much, opened up the conversation as if he were telling the story of another man.

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Carl Schwarzschild is a real prodigy, not the kind of ancient Chinese prodigy who knows words and can write two songs since he was a child, and then scraps it when he is older.

He taught himself astronomy, mathematics, and physics since he was a child, and in 1890 he published two papers on the orbits of double stars in the German journal "Astronomical Bulletin", and proposed a paper on the periodic solution of the three-body problem.

At that time, he was only 15 and a half years old.

Jiayu liked the science fiction novel called "The Three-Body Problem" very much, but he didn't expect that Schwarzschild had written a paper on this topic more than 100 years ago.

Jiayu's eyes straightened, and he was ashamed to recall that when he was fifteen years old, he still had a headache for Ma Zhe when he was calculating plane geometry in the classroom, or memorizing English words......

The only conclusion is that "people are more popular than ...... dead"

After that, the first half of Schwarzschild's life was the first half of Xueba's life that swept the world.

He has published papers on electrodynamics and geometrical optics in leading European journals and has presided over a large-scale stellar survey at the Observatory to study how stars transfer energy by means of radiation.

A few years later, he published an important paper on the balance of solar atmospheric radiation.

It wasn't long before Karl Schwarzschild was recommended to the Potsdam region of Germany as the head of the astrophysical observatory.

The most respected position in German astronomy, Schwarzschild almost reached the top of his astronomer's career.

Six years ago, in 1910, Halley's Comet, which passes by every 76 years, reappeared in the night sky.

At the observatory, Schwarzschild observed and studied for several days and nights, and then published numerous papers.

After that, he began to do another research in the field of spectroscopy, and within a few years he reached the status of a global leader.

Old Schwarzschild said very plainly, but Jiayu was stunned when he heard it, and said in his heart, "You are old, you are a big man!" I have become the head of the observatory. ”

Schwarzschild then spoke blandly about his election to the German Academy of Sciences at the age of 40.

Jiayu wondered, "Academy of Sciences? Are you sure it's not a research institute in that village? ”

Schwarzschild smiled wryly, "When the war broke out, I was two months away from my 41st birthday. However, our motherland is already on the verge of life and death, and every citizen has the obligation and responsibility to contribute to the continuation of the motherland's civilization and the survival of Germany! We are not an evil country, we are not an evil people, we yearn for freedom! ”

Jiayu was silent, and in his impression, the First World War was an unjust war started by the reshuffle of the imperialist countries because of the unequal distribution of spoils.

To put it bluntly, it's "dog eats dog", and it's not a good thing!

But old Schwarzschild is already an academician of national physics, a cadre equivalent to the governor level in China, and he still comes to the battlefield to work hard?

This doesn't seem to be something that dog-eat-dog can explain.

Schwarzschild took a shallow sip of the whiskey, and then coughed violently, and his lungs were about to cough out.

"After I was drafted into the army, the recruiting officer asked me if I wanted to enter the army staff headquarters or if I was the head of logistics. I thought, I still have some experience in mathematics, so I said, let me go to artillery, so they put me on the Western Front. ”

Old Schwarzschild seems to have not spoken for a long time, somewhat talkative.

"In the Battle of Verdun, I fired a million shells, and when the battlefield was deadlocked, the War Department sent me to the Eastern Front, it was a little cold here, and I was old, and I did feel a little uncomfortable!"

Jiayu couldn't wait to grab old Schwarzschild's neck and shouted, "You are an academician, an academician, not a cabbage, not an undergraduate, and you can't use it like this!" ”

Schwarzschild smiled and didn't speak.

He seemed to be a little distracted, his thin face was a little lonely, and his round glasses were covered with dust.

"Let's not talk about this, during this time, a genius appeared in the country, called Albert Einstein. He was very powerful, published the paper "General Relativity", and proposed a very interesting new theory; And Mr. Planck, who proposed quantum physics, I was very interested and sent them some of my experiences. ”

From his backpack, Schwarzschild took out a thick stack of manuscript paper and handed it to Jiayu.

When his hand was halfway out, he remembered that the person in front of him was just a lieutenant, a soldier, and he would not be interested in such a thesis.

Schwarzschild wrecklessly prepared to take back the papers that had been handed out.

Jiayu snatched the manuscript paper full of German and read it carefully by the light of the fire.

At the heart of Schwarzschild's thesis is the "Stark effect".

The spectral lines of hydrogen in the electric field are separated, and the degree of separation is directly proportional to the intensity of the electric field, and the stronger the electric field strength, the greater the spectral line separation.

Moreover, this phenomenon can be proved from the public hypothesis of quantum theory.

"Anything else?"

Jiayu found that this dusty old man had surpassed countless people in later generations.

Schwarzschild pulled out another stack of manuscript paper from another bag in his backpack, the top of which was a letter Einstein had written to him.

"I read your paper with the greatest interest. I didn't expect anyone to find an exact solution in such a concise form. I really like the way you do the math of those objects. - Albert Einstein"

In 1915, Albert Einstein proposed the famous "Einstein Field Equation", known as the EFE equation - "Einstein's equation".

It describes the curvature of space-time caused by matter and energy, and is one of the most well-known formulas in general relativity.

After deriving this equation, Einstein calculated many times, but did not come up with an exact solution, and he believed that this equation had only an approximate solution.

On the 20th day after arriving on the Eastern Front, Schwarzschild completed the exact solution of Einstein's field equations.

In the rumbling sound of cannons, he wrote an extremely obscure paper, and if Jiayu did not have the knowledge of countless civilizations in his head, he would not be able to understand it at all.

The papers written by scientists during the First World War were not popular science books like "A Brief History of Time" after all.

Schwarzschild calculated that a new kind of object could exist, and that when its mass increased enough that light would never leave the surface of the object!

Schwarzschild had calculated the strange object, but he felt that he had miscalculated.

Or this is a mathematical solution, a game of brain power, and there is no such celestial body in nature that light cannot escape.

Jiayu whispered, "Black hole ......"

Schwarzschild coughed uncontrollably this time, and after a few moments, he continued, "There is no corresponding physical meaning at all. ”

Smoke wafted in the dreary night sky, and there was no room for such a tiny physicist's desk in Europe.

"Mathematics, physics, chemistry, and astronomy are all moving forward in the same direction, and it doesn't matter who is left behind, or who is ahead and helping. Astronomy, on the other hand, is most closely related to this circle of exact sciences...... Mathematics, physics, and astronomy constitute a 'knowledge' that, like 'Greek culture', can only be understood as a perfect whole. ”

Schwarzschild said.

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…………

All night long, Jiayu asked Schwarzschild what a star is, the nature of light, the relationship between the electric field and spectral lines, and the mathematical expression of energy radiation......

100 years ago, in a corner of the battlefield that no one remembers, Schwarzschild was teaching Jiayu the most mysterious knowledge of physics.

Jiayu has put a patch on the shortcomings of primary knowledge.

By dawn, Schwarzschild had fallen asleep with a flask, and Jiayu was still carefully reading a few papers.

More than 100 years ago, on the battlefield in Russia, a small German artillery lieutenant revealed the existence of one of the most mysterious celestial bodies in the universe - black holes.

It wasn't until more than 50 years later that a group of scientists did prove that there are black holes in the universe!

The earliest theory is derived from a pen and a piece of paper.

This genius of physics, who calculated the existence of black holes, has been lost in the long river of history.

The 72-hour mission time was almost over, and Jiayu relaxed a little.

He nudged old Schwarzschild, and the delicate silver flask fell from Schwarzschild's hand.

In the past 100 years, Germany's greatest physicist has fallen into a deep coma.

Jiayu panicked, "Ambulance!" Ambulance! Where are they all dead! ”

The soldiers rushed Schwarzschild to the field hospital, who had fallen into a coma, and the bearded doctor recognized Schwarzschild, shook his head, and did not begin resuscitation.

Jiayu pulled out a pistol and pressed it against the doctor's forehead.

He gritted his teeth and said, "Hurry up and get people back!" ”

The doctor was sweating profusely and said in a trembling voice, "Carl is no longer good, a few days ago, I issued a critical illness notice to him, and arranged for the staff to send Carl back to Munich, his pemphigus has developed very seriously. ”

Jiayu was dumbfounded, the old man was sick? I risked being killed by a shell to save people, and I saved them in vain?

He still insisted that he save people no matter what!

In World War I, there was no penicillin, no sulfonamides, no special drugs, and doctors had no choice.

Jiayu hurriedly collected some herbs from the field, boiled them, and slowly fed them to the old physicist.

After a long time, old Schwarzschild finally opened his eyes again, "Am I still alive?" ”

The doctor who was examining had a gloomy face.

The old man's condition was very poor, there was no relief, he was already close to dying.

At this time, Jiayu had completely forgotten about the task.

He just wanted old Schwarzschild, an academician of the German Academy of Sciences, a lieutenant of the artillery regiment, to get better, and his death could only be the greatest loss in the world.

Old Schwarzschild felt Jiayu's concern, and patted Jiayu lightly with his thin palm, "I like what Kant said, 'There are only two things in this world that can deeply shock our hearts.'" ’”

"One is the brilliant starry sky above our heads, and the other is the sublime moral law in our hearts."

On his deathbed, the elder Schwarzschild knew that he had achieved these two ideals and had no regrets.

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The old lieutenant calculated the formula, which later generations called the "Schwarzschild radius".

Within the Schwarzschild radius of a black hole, light will never be able to leave until the end of the universe.

The ultimate limit from which light cannot escape is called the "horizon".

…………

At dusk, the old scientist fell into a coma again, and this time, it was difficult for him to wake up.

The battlefield was silent, and doctors and nurses were rushing back and forth.

Outside, a burst of enthusiastic cheers suddenly erupted, and Jiayu raised his head blankly.

A red-faced young soldier got into the tent of the field hospital and shouted, "We are going to have a party with the Russian army, and if you want to come, you can come and enjoy food and music together!" ”

The night before, both sides came out with their brains, and the next night, the two parties wanted to have a party, funny?