The headmaster appeared on a large air screen, and then a deep voice came, "What are you doing?" Shangguan, you still have time to teach them here! ”

"We don't have time to talk about the impact of the moon turning into a black hole on the planet."

Professor Shangguan was taken aback, looked at Yu Chimu thoughtfully, and said with a gloomy expression, "Is it really...... Did it happen? ”

"Yes, Shangguan, I should have listened to you a long time ago. The Earth was swallowed by the black hole of the Moon. The headmaster said sadly. Now that black hole is getting bigger and bigger. ”

"What?" Luo Chuan and Nangong Tian asked in unison.

Professor Shangguan sighed deeply and said, "I knew there would be this day. ”

After a black hole consumes any matter, it releases a large amount of radiation. Black holes in engulfment are sparkling because as large amounts of matter are sucked into the black hole along a spiral path, they are constantly heated, emitting dazzling light in the process.

And black holes are going to continue to devour other things, like their food.

Luckily, the black hole's food isn't that easy to find, so it won't be very dazzling so far. Most of the time, the black hole will only violently change the orbit of the interstellar dust around it - one grain of sand sucks up another.

Unfortunately, the next food found by the moon's black hole is the Earth.

"The Earth is 384,000 kilometers from the Moon!" Professor Shangguan said sadly, "At such a distance, the earth is still swallowed. ”

"What about humans on Earth?" Luo Chuan asked anxiously, "Have they all been swallowed by a black hole?" ”

The headmaster's head was buried lower, "It's all gone." ”

What does it mean for the Earth to become a black hole?

The Earth is home to millions of creatures, including humans, and is the only celestial body in the universe where life is known. The radius of the Earth's equator is 6378.137 kilometers, the polar radius is 6356.752 kilometers, the average radius is about 6371 kilometers, the circumference of the equator is about 40076 kilometers, and 71% of the earth is ocean, 29% is land, so the earth is blue in space.

Earth is the only planet where humans live on the planet discovered so far.

Core planets, as well as other planetarians with human footprints, are immigrants to Earth.

The disappearance of the earth means that the roots of humanity are broken.

If the star protector is unable to have children, then it means that the core planet is going to be finished.

"I haven't been to Earth yet, and the Earth is gone." Nangong Tian said.

Thinking of this, I can't help but feel a little regretful, when I was on the nameless planet, I had nothing to do, and I traveled all over the major galaxies of the whole interstellar world, the Andromeda Galaxy, the Sagittarius Galaxy, and the solar system.

He has been to almost all of the eight planets in the solar system.

But only the earth, he has not been.

It's not that he doesn't want to go, but he has long heard that Earth is more fun than any planet in any galaxy, and he plans to take his girlfriend to travel to Earth in the future.

"It's a pity that I won't be able to go to Earth in the future." Nangong Tian looked at the huge air screen and let out a long sigh.

Luo Chuan suddenly stood up from his chair and said to Yu Chimu on the air screen, "Principal Wei Chi, I think we should do something." ”

The eyes of the entire history classroom instantly turned to Luo Chuan.

Luo Chuan's face turned crimson, and his hands were clenched, "Headmaster, we should do something, Yuxing High School will continue to exist, and Interstellar will continue." ”

"I said," Nangong Tian patted Luo Chuan's shoulder, "I said buddy, haven't you woken up yet, do you know what the principal said just now?" It was a black hole, it was originally a black hole the size of the moon, and for the universe, it was a grain of sand, and now it has swallowed the earth, and this black hole has become more powerful. ”

"I'll give you a science popularization now, Luo Chuan, you can listen to me." Nangong Tian walked briskly to the glass plate in front of the classroom, and wrote "black hole" on it with his fingers.

Nangong Tian turned his head, "Luo Chuan, take a good look" He turned sideways and pointed to the word "black hole" beside him.

"Do you know why it's called a black hole?" Nangong Tian put his hands behind his back, with an indifferent expression on his face, pacing back and forth in front of the glass plate, "Because in the face of a black hole, even light can't escape." Nangong Tian's face instantly became serious.

"The mass of a black hole is so great and its size is so small that the gravitational field it produces is so strong that it is impossible for any matter or radiation to escape when it enters one of the event horizons (critical points) of the black hole, not even the fastest propagating light (electromagnetic waves) known to date."

Black holes cannot be observed directly, but their existence and mass can be known indirectly, and their effects on other things can be observed. Information about the existence of black holes can be obtained by using the "edge information" of ultraviolet and X-ray rays emitted by high heat before the object is inhaled. The existence of black holes can also be inferred by indirect observation of the orbit of stars or interstellar clouds. Scientists' latest theories suggest that when a black hole dies, it may become a "white hole", which, instead of swallowing up all the matter in its vicinity, ejects all the matter captured by the previous black hole.

Nangong Tian mentally converted the data of the earth into a black hole, and then he drew a pea on the glass plate.

"If you want the Earth to be a black hole, you need to compress it to the size of a pea." Nangong Tian pointed to the glass plate and said.

Luo Chuan was taken aback.

It's not that he hasn't heard of the word "black hole", on the contrary, because when he first entered the history school, he cleaned the museum every day, so he had the opportunity to read some books, and he clearly remembered that there was a book imported from the earth, called "Astrophysics", which had detailed chapters about the formation of black holes.

Black holes are created by the gravitational collapse of a massive enough star after it runs out of fuel for a nuclear fusion reaction and dies.

"Isn't it only stars that can turn into black holes? How can the Moon, which is just a satellite of the Earth, become a black hole? Luo Chuan thought of the words in the book, and couldn't help but wonder if everything that Professor Shangguan said just now was just a hypothesis, "Professor Shangguan, are you sure that the moon has really become a black hole?" ”

Professor Shangguan turned on the air screen, and the interstellar map that appeared on it, the location of the moon was indeed replaced by a grain of sand-sized material.

"It's a bit against the laws of nature when this happens." "But it did happen. ”

"Yes, it did." Yu Chimu turned around, leaving a desolate back, and he sighed, "Shangguan, I really regret that I didn't listen to you at the beginning. ”