I really don't want to lie down and win

"Is it true that when a photon enters the innermost stable orbit of a black hole, it will be infinitely circled, so can we see it?" the student asked.

"It's not an infinite circle, because the matter around the black hole will interfere with the photons. Once the interference either falls into the black hole, or escapes from the black hole." Xu Mang said seriously: "But these escaping photons cannot be observed by us." , which cannot be done with current technology.”

"in conclusion."

"In the innermost stable orbit of the black hole, the photon may be surrounded, but the matter will affect the photon, resulting in an interference phenomenon. At this time, the photon has two choices, escape from the black hole or enter the black hole, but no matter the escaped photon, it will fall The photons that go in, the photons that continue to stay in the innermost stable orbit, we cannot observe."

Xu Mang paused for a moment, and asked seriously, "Do you understand?"

"..."

"..."

"..."

I understand, I understand.

But why feel a little sad?

Has IQ been crushed?

Xu Mang glanced at the students, and asked with a smile, "Is there anything else I need to ask? You can answer any questions, and I can answer them for you."

Listen!

Is this human talk?

Mad.

Although several students were very angry, their mouths were very honest. One of the students raised his hand and asked, "Master Xu, will all the matter in the universe be swallowed by black holes?"

"..."

"Student, your question..." Xu Mang said helplessly, "Do you know that there are one to two, or even three, supermassive black holes in every galaxy in the universe. Have those galaxies been swallowed up?"

"The evolution of galaxies and the growth of black holes are coordinated with each other. In addition, in order for matter to be swallowed by black holes, the angular momentum must first be extremely small." Xu Mang paused for a while: "That means you have to fall freely into the black hole to get rid of it." OK."

"Unless...the entire universe stops all physical phenomena." Xu Mang said, "Of course...impossible."

"Next!"

words fell,

Another student asked a question.

"Master Xu...can you explain why the spaceship speeds up when it flies past the black hole in the movie?" the student asked.

"..."

"You should know about Hawking radiation, right?" Xu Mang asked.

Several people present nodded.

"General black holes, that is, Kerr Newman black holes, have spin. This kind of black hole has an energy layer. One particle falls into the energy layer and becomes two. One particle energy becomes negative energy, and the other particle The energy of the particles will become larger, the ones with higher energy will run out of the energy layer, and the ones with lower energy will enter the energy layer.”

"After all, energy is always conserved, so where does this energy come from?" Xu Mang asked, "Who can answer?"

"..."

"..."

"..."

Several people shook their heads.

Xu Mang smiled bitterly: "Actually, there are negative energy particles in the ergosphere, which are reversed from the black hole and fall into the black hole. Because of the conservation of rotational angular momentum, a higher energy particle and a slower rotating black hole are ejected. "

"Do you understand?"

"The energy comes from the rotational energy of the black hole!" Xu Mang said, "That's why the spaceships in some sci-fi movies speed up as they pass by the black hole. This is to extract the rotational energy of the black hole."

"Next!"

at the same time,

The professor standing next to him felt something was wrong. It wasn't because Xu Mang's explanation was not vivid enough. The problem was that he gave an easy-to-understand description of the doubts raised by the students. Although he could quickly understand the mystery, However...the students are all autistic.

This...

How to do?

The current situation is completely contrary to the original intention of the professor. He originally planned to use Xu Mang as a free labor force to increase the students' enthusiasm for learning and knowledge inventory, but the real situation is that the knowledge inventory has increased and the learning enthusiasm has decreased a lot.

No no no!

Can't continue to ask, otherwise these students will quit the research group.

"Okay, okay...let's stop here." The professor hurriedly stopped the questioning session, and said to Xu Mang, "Xu Mang...would you like to guide me on the black hole collision model?"

"Your modeling skills are very strong, and you can see it from the theory." The professor said seriously: "How about...guiding them?"

"Oh..."

"That's right." Xu Mang said, "Don't study the issue of light and black holes, it's meaningless."

"do not worry."

"This is just an after-school research for students, and our main goal is to explore the existence of gravitational waves," said the professor.

Then,

Xu Mang stood behind a student, watching him tinkering with the computer.

After watching for a few minutes, Xu Mang came behind another classmate. After watching for a few more minutes, he came behind the third classmate. Finally, Xu Mang chose to ignore it.

Heartache!

If the guess is correct, this collision model is based on the gravitational waves of the general theory of relativity, as proven cases.

However...

What Xu Mang saw was a conservative, rigid, and inflexible model experiment.

how to say,

These are great people, but not for astrophysics.

imagine boldly,