The Ph.D. in physics is an achievement, Shen Qi received 500,000 points for academic excellence, and he submitted his paper "On Complexity" to the "Physical Review Letters" to brush up his reputation in the physics community.

Good things come in pairs.

There was a piece of news from the Chinese side that made Shen Qi excited.

Yan University School of Mathematics sent a letter of appointment to Shen Qi, wanting to hire Shen Qi as a visiting professor of Yan University School of Mathematics.

In the history of the Yan University School of Mathematics, only six visiting professors have been hired, and there are two living professors, Qiu Chengtong and Griffiths.

Mr. Qiu is a Filipino Prize winner, and Griffith is a Wolf Prize winner, both of whom are big names in the field of mathematics.

The visiting professor of Yan University is commonly referred to as the chair professor, and in order to distinguish the 11 Yangtze River chair professors in the School of Mathematics of Yan University, he is called a visiting professor.

Visiting professor is an extremely noble title and honor, and only those who have made outstanding achievements in a certain field are eligible to be hired as visiting professors by the top domestic scientific research institutions such as the Yan University School of Mathematics.

In the history of the Yan University School of Mathematics, there are only two people with higher status than the six visiting professors: Cherish and Fan Tuji.

Mr. Chen's glorious history does not need to be repeated, Mr. Fan was born in the Department of Mathematics of Yan University, and is one of the founders of modern mathematics in China, along with Su Buqing and Hua Luogeng.

Mr. Chen and Mr. Fan are honorary professors of Yan University, and although the two outstanding mathematicians have left us, their names will forever be engraved in the hearts of Yan University and all Chinese mathematicians.

He is now a tenured professor at Harvard University, a Distinguished Professor and Director of the Institute of Mathematical Sciences at the University of Chinese Hong Kong, and the Director of the Yau Center for Mathematical Sciences at Mizuki University.

P. Griffiths, this old man is in the Institute for Advanced Study in Princeton, and Shen Qi often meets him.

Visiting professors at Yan University are equivalent to honorary titles, there are no hard scientific research tasks and teaching tasks, and they have 1 to 2 months a year to give lectures at Yan University to guide and guide outstanding young people in mathematics, which is the work task of visiting professors.

You can understand that visiting professors are part-time, perhaps one of the best in the world.

P. Griffiths's tenure as a visiting professor at the School of Mathematics of Yan University has expired, and he has not renewed his contract with Yan University.

The Fields Medal winner Shen Qi is the most suitable candidate for a new visiting professor who is a new visiting professor with dazzling achievements, global fame, and a young age.

Shen Qi happily accepted the appointment letter of visiting professor at his alma mater, Yan University, and will return to China soon to accept a formal appointment.

Shen Qi was in a good mood tonight, and it happened to be a sunny night, so he drove Ou Ye to the barren mountains and mountains 5 kilometers south of Princeton, and watched the stars at night.

The 381 mm Schmidt-Cassegrain astronomical telescope is very large, and to play with this equipment, you must have a large car, because the best places for astronomical observation are usually in the field, where there is less light pollution.

Light pollution from street lamps, outdoor billboards, office buildings and private homes is one of the most hated things by astronomers and astronomy enthusiasts.

Princeton University is a secluded hideaway, but at night, the lights in the dormitories and library are still bright.

The barren mountains and mountains 5 kilometers south of Princeton are the best places for Shen Qi to stargaze, he has been here alone a few times before, and tonight is the first time he has brought Ou Ye here.

Until July this year, Shen Qi had never played with an astronomical telescope, and he spent several weeks studying the instructions for the 381mm Schmidt-Cassegrain astronomical telescope, and after a few months of practice, he now plays 666.

Shen Qi's astronomical telescope is worth $30,000, which is considered a high-end item for amateurs.

If you want to play a little more high-end, you have to go to the observatory, where there are more advanced astronomical observation equipment.

Astronomical telescopes over $2,000 are generally equipped with an equatorial device and a positioning device, and through a computer guide system, the telescope can automatically lock on to the object that the observer wants to observe.

Maybe you can't tell which one is Sirius and which one is Nanhesan, but that's okay, the Advanced Astronomical Telescope will help you find the brightest star in the night sky.

"Come on, little leaf, your eyes are on the eyepiece, OK, good, keep this position, and then you will see the most shocking picture. Shen Qi taught Ou Ye the correct posture of looking at the stars.

"Little leaf, what do you see now?"

"Wow, cool!"

"Let me help you describe the planet you see hidden under a dense atmosphere of carbon dioxide, mixed with sulfuric acid rain, where the surface is so hot that lead with a melting point of 328 degrees instantly turns into a liquid state. What hell is, this is hell, yes, little leaf, this star you are observing is our neighbor Venus--- ”

"Wow, cool!" Ou Ye could only shout.

Shen Qi adjusted the equatorial device and instructed Ou Ye to continue looking at the stars.

"Let's look a little farther away, out of the solar system, into the Milky Way. Little leaf, do you see two bright balls close together?"

"That's right!"

"They are two stars that make up a binary star system, and under the strong gravitational pull, the binary star waltzes, and millions of tons of gaseous stellar material flow between the two stars every second, and this tug-of-war will end with the explosion of one of the stars, and the big bang will scorch all the nearby planets in an instant. Yes, Little Leaf, the two stars you are observing are the β of Lyra. ”

"It's scary......"

"In fact, most of the stars in the universe move according to the binary star or concentrating star model, and the sun is so lonely that it is one of the few single stars in the universe, one of the few single dogs. ”

"My understanding is that if the single dog Sun has a partner by his side, our earth will be finished?"

"Yes, I presume. ”

"Super scary...... It's still a good ...... single dog."

"Little leaf, do you remember Poincaré's three-body model?"

"Well, I've done this in biology, topology, it's so hard. ”

"Dead to the textbook, of course, it's hard to understand. Come out and look at the stars, and the problem will be solved. Come, I'll teach you Poincaré's three-body model. ”

"Hmm...... It's the wild!"

"Then let's go to the car. ”

The seven-seater Mercedes-Benz GLS folded down the rear seats, opened the panoramic sunroof, and Shen Qi and Ou Ye lying in the car looked at the stars in another way.

"You see, the brightest star in the night sky is Sirius, which has a magnitude of -1, and as long as you leave the heavily polluted city, humans can easily lock on to Sirius with the naked eye. Shen Qi put his arm around Ou Ye with one hand and pointed to the bright starry sky with the other.

"I want to be like that, keep watching, it's beautiful. ”

"Then keep looking at it like this. ”

"But strange, you're leaving tomorrow. ”

"Whether it's China or the United States, we see the same stars. ”

"Well, it's better to study the stars than to study earthquakes......"

The two lingered under the stars, and after dawn Shen Qi left Princeton for New York Airport, where he took a flight to the Chinese capital and was about to take on an important part-time position.