I really don't want to lie down and win

"I?"

"Of course I am also an observer." The little brother smiled: "But I am better than them, including you, in terms of astrophysics."

What the hell!

Met a poser!

Good guy... How dare you pretend to be aggressive in front of me, Xu Mang?

Xu Mang was so angry, he always used his routine to trick others, but today he was given a trick by someone else. The problem was that he was given a trick by a graduate student. This was the biggest stain in the history of his routine.

"Ugh!"

"Does your family know that you are so awesome?" Xu Mang asked helplessly, "Good guy... You are obviously an auditor like me, how did you pretend that you are an astrophysics major?"

"..."

"You can't say that." The brother smiled wryly, "I might be a little better than you, of course...I mean possible."

"Dare you ask where the brother is sacred?" Xu Mang asked.

"Du Yuan."

"Oh..." Xu Mang nodded, and said silently, "Do you know who I am?"

Du Yuan was stunned for a moment, and said calmly: "It doesn't matter who you are to me, you just met by chance, maybe after tomorrow, we won't have any intersection, so it's good if you don't know the name, less worry and more persistence." read."

Xu Mang: °ー°〃

Heck!

Meet a well-matched opponent.

I feel like he's mentally ill.

soon,

A rather dignified professor walked in, without calling names or anything, and started the class directly.

"Today we will mainly explain the physical properties of neutron stars." Although this professor is short-tempered, he has a wealth of knowledge, which can be inferred from his hairstyle and volume. After all, he is extremely smart.

"When a massive star evolves to a late stage, it will accumulate a huge iron core through nuclear combustion. When the iron core reaches a certain mass, it will collapse due to excessive pressure, resulting in violent gamma-ray bursts and supernova explosions. And a neutron star was born."

"In fact, a neutron star is an ultra-dense star composed of neutron matter, but how high is the density of a neutron star? I will give you 5 minutes to estimate the density of a neutron star. First, the mass of a neutron star is about the same as that of the sun, and its radius is ten kilometers."

"The sun has a radius of 70 kilometers and a density of 1.4 gcm3."

words fell,

The professor said seriously: "Start to calculate, the time is 5 minutes."

Soon everyone began to count. Of course, there were a dozen or so auditors who were paid for nothing, silently sitting in their seats, waiting for the announcement of the answer.

Seeing the tense calculations of the students present, Xu Mang couldn't help feeling a little confused, and asked curiously, "Oh...is this a freshman?"

"How do you know?" Du Yuan said in surprise, "It's indeed a freshman."

"..."

"I don't even know the quick conversion between two stars with the same mass. What do you mean if it's not a newborn?" Xu Mang said helplessly: "When two stars have the same mass, their density is inversely proportional to the cube of the radius. .”

Du Yuan froze for a moment, then said suspiciously: "Are you sure?"

"..."

"Are you doing research in the astrophysics group?" Xu Mang asked, "Don't tell me, you are only in charge of calculations?"

Du Yuan nodded awkwardly: "Then do you know the density?"

"Do you have a pen and paper?"

"Have!"

I don't know where Du Yuan took out the pen and paper and handed them to Xu Mang.

less than ten seconds,

Xu Mang completed the calculation of the neutron star density, PnsRRns3xP700000103x1.41014gcm3

"Give!"

After Du Yuan got the answer, he looked at Xu Mang in horror, and asked cautiously, "Brother... right?"

"Try it." Xu Mang shrugged and said calmly.

The reason why Xu Mang gave up the answer was because he didn't want to bear the title of autism maker anymore, and he wanted to give this title to Du Yuan.

Du Yuan thought about it, raised his hand hastily, and shouted at the professor: "Professor, I'm done!"

As soon as the voice fell,

It caused an uproar.

"You are..."

"An auditor?" The professor saw Du Yuan and saw that there were no textbooks on his desk, so he knew that this person was here to audit.

"En!" Du Yuan nodded.

immediately,

The professor came to Du Yuan's side, glanced at his answer, and couldn't help but praise: "Which department are you from?"

"Department of Mathematics..."

"I'm a graduate student, and I happen to be in the astrophysics research group, responsible for the calculation program." Du Yuan said seriously: "In order to strengthen my business ability, I came here to listen to your lectures. Keep it all in mind."

Xu Mang: ￣￣;

Talent!

Do not,

This is a wolf off.

"Not bad!"

"It's good to be self-motivated, keep working hard." The astrophysics professor nodded repeatedly.