When Luo Chuan was sleeping soundly, Interstellar Tong forcibly pulled him back from his happy sleep.

Professor Shangguan spoke to him from his office, "Xiao Chuan," Professor Shangguan said, "Wake up Nangong Tianya." ”

"Why?" Luo Chuan said sleepily.

"The moon has become a black hole."

Luo Chuan suddenly became completely conscious.

Is there any mistake, a few days ago, I used the interstellar pass with Suzaku to read the information of the moon.

It's a black hole so quickly......

"Nangong Tian" Luo Chuan lifted his quilt and walked straight to Nangong Tian's bed, "Nangong Tian, wake up, wake up." ”

Nangong Tian's snoring was like thunder, and he was deeply immersed in sweet dreams.

Luo Chuan walked to the water pipe, took a glass of cold water, and walked to Nangong Tian's bed. The hand is gently tilted by a specific arc.

"Who is this!" Nangong Tian sat up abruptly and wiped the water on his face with his hands, "Luo Chuan, I'm not done with you." ”

"You splashed water in my face in the middle of the night?" Nangong Tian picked up the slippers on the ground and raised them to throw them at Luo Chuan.

"The moon has become a black hole." Luo Chuan said coldly.

"No, it won't." Nangong Tian put down the slippers he raised again, and his expression was gloomy. "Interstellar said."

Luo Chuan nodded, "Professor Shangguan woke me up just now, and then asked me to wake you up." Let's go find Professor Shangguan in a moment. ”

Faculty of History classrooms.

"Professor, what's going on?" Luo Chuan asked anxiously, "Wasn't the moon okay a few days ago?" ”

"That's right." Nangong Tian said, "Haven't we been testing the moon all the time? Isn't the data on the moon normal all the time? ”

Professor Shangguan stroked his gray beard and said in a low voice, "I just found out." Then, he handed Luo Chuan a stack of kelp paper.

Luo Chuan took the kelp paper tremblingly, his eyes flustered, "How is this possible?" ”

Nangong Tian snatched the kelp paper and threw it on the table, "What do you see, it's all turned into a black hole anyway, what else can we do?" ”

"The moon is so far away from the core planet, what does it have to do with us!" Nangong Tian stretched, "Let's go, Professor, Xiaochuan, let's continue to sleep." As he spoke, he took Luo Chuan's arm and prepared to walk towards the door.

"Stop." Professor Shangguan shouted. "As my students, you have to learn to be responsible. Responsible for the core planet, responsible for the interstellar. ”

Luo Chuan and Nangong Tian stood still instantly.

The two turned their heads almost at the same time.

A large transparent screen instantly appeared in the center of the classroom.

In the huge cosmic picture, there are stars.

"Keep an eye on that place." Professor Shangguan pointed to a place in the image.

It's about the size of a grain of sand.

"This is the moon?" Luo Chuan and Nangong Tian asked in unison.

Professor Shangguan nodded, "According to the latest data, the size of this black hole is between fine sand and medium sand. ”

Nangong Tian continued, "I estimate that a black hole of the moon's mass can pass through any sieve. ”

"Since the mass and position of the Moon have not changed, the tides on Earth will not be affected in any way."

"The moon is far, far away from us, and we can't see it from afar." Nangong Tian said, "What does it have to do with us when it turns into a black hole?" ”

"Besides, the Earth is far enough away from us, and it has nothing to do with us."

"Of course." Luo Chuan said.

The Earth is one of the most important planets in the interstellar world, and it is one of the eight planets in the solar system. It is rich in rivers, lakes and oceans. Countless animal and plant resources. Therefore, it is also one of the food sources of the core planet of the interstellar center.

If the Earth is affected, the resulting impact will also affect the core planets and, in turn, the interstellar.

"There are many resources on Earth that we don't know, and they are the last hope of our stars." Luo Chuan said thoughtfully.

"Luo Chuan is right." Professor Shangguan said, "Have you ever thought that the Star Protector can't have children, and where do we interstellar people come from? ”

Luo Chuan and Nangong Tian looked at each other.

"Don't tell me ......," the two said in unison again.

The answer to this question came to their minds at the same time.

The Star Protector came from Earth before becoming the Star Guardian......

They are immigrants from the earth.

"I think you've all thought of it." Professor Shangguan said, "All human beings in the interstellar world are earthlings, even if they are not from Earth, they are also descendants of Earth immigrants. ”

"Now you know what it means for the moon to become a black hole, right?" Professor Shangguan said.

The two were already stupid there.

The gaze is glazed and motionless.

It was the first time they had heard such a brief interstellar history, and it was also the truest and most unbelievable interstellar history they had heard.

"Professor, don't tell me, call the two of us in the middle of the night" Nangong Tian deliberately raised his voice, "just want to tell us about the history of the stars?" ”

"When you float outside a spherical object, the amount of gravitational pull it has on you is only related to the distance between you and its center of mass, but whether the mass is concentrated on the center of the sphere or evenly distributed. If the Moon were replaced by a black hole with the same mass, the Earth's orbit would not change, but life on Earth would be different. ”

"Not only is the earth darker, but it is also colder, because the moonlight warms the earth." Professor Shangguan explained.

"No, the moonshine is cold." Luo Chuan retorted.

He's read a lot of poems and songs about moonlight.

"The cold moonlight seems to kiss the lover's lips." Luo Chuan shook his head and said.

"This heating effect is insignificant for the energy balance of the earth, and the brightness of the moonlight is five to six orders of magnitude different from the moonlight. But I have to admit that it did play a role. ”

"So, you mean that the earth is getting colder, and the creatures of the earth are ......" Nangong Tian said halfway, and his head gradually lowered.

He didn't dare to say any more, because he couldn't imagine what it meant for the earth to get colder and darker.

Many plants or animals will go extinct, and many will freeze to death......

"From the data point of view, the moonlight formed by the moon's reflection of sunlight raises the temperature of the earth by 0.0012 degrees Fahrenheit." Professor Shangguan explained, "Without moonlight, the Earth would be lowered by 0.0012 degrees Fahrenheit. ”

"Say it earlier!" Nangong Tian let out a long sigh of relief.

"It's just that I didn't say it earlier, this temperature is not at all insignificant to the earth." Luo Chuan's spirit instantly relaxed, and he found a chair to sit down, "I knew that this matter would not have a big impact on the earth, I should really go back to the dormitory with Nangong Tian just now and continue to sleep." ”

Professor Shangguan sighed deeply, he didn't know how to explain the huge impact of this to the children.