Cheng Xuedong was shocked by the truth told by the girl on the phone, opened his mouth wide, and didn't make a sound for a long time.

"Hey, Mr. Cheng, are you listening?"

Cheng Xuedong came to his senses at this time: "Oh, I'm listening." ”

Liu Yan's tone was tactful: "In fact, the dream of the two of you is also my dream, and it is the dream of hundreds of millions of Chinese." Teacher Cheng, you have to come on. ”

Cheng Xuedong's eyes moistened, and he nodded gently: "I will, thank you." ”

After Cheng Xuedong hung up the phone, he couldn't help but tilt his head and take a deep breath. He needs to regulate his emotions and devote himself to his busy scientific research.

However, when he walked to the door of the studio, he suddenly thought of something, and quickly took out his mobile phone, saved the caller number just now, and filled in the contact - Yan'er.

At this time, he glanced at the studio, not only Liu Xiaoguang was not there, but even Nan Binghuai was nowhere to be seen. Although he was a little curious, he didn't have time to think about it, so he immediately started the computer mouse he used for work and started a new program operation...

Besides, Liu Xiaoguang led his sons Liu Ning and Li Mengmeng to the astronomical observatory, and what he faced was an astronomical telescope.

This is an ordinary astronomical telescope, the head is not too big, it has two large and small tubes, the large one is the main mirror, which is used to observe the target, and the small one is called the star finderscope, which is used to find the target, also called the sight. The large and small lens barrels need to be observed in conjunction with each other.

When Liu Ning was a child, he was brought over by his father to visit once, so he still had sporadic impressions, so with the help of his father, he first began to observe through the large mirror tube.

Li Mengmeng was in close contact with the astronomical telescope for the first time, so she looked at every part of it curiously, and asked from time to time: "Brother Liu, how much does this instrument play a role in studying astronomy?" ”

Liu Xiaoguang replied solemnly: "Astronomical telescopes are important tools for observing celestial bodies, and it is no exaggeration to say that without the birth and development of astronomical telescopes, there would be no current astronomy." With the improvement and enhancement of the performance of astronomical telescopes in all aspects, astronomy is also experiencing a huge leap forward, rapidly advancing our understanding of the universe. ”

Li Mengmeng's heart moved: "Is the aperture of the telescope you want to develop really 500 meters?" ”

"Of course. It's the size of thirty football fields. ”

"But I see that the aperture of your telescope here is not large, if you develop a 500-meter aperture, how can you observe it?"

Liu Xiaoguang smiled: "The telescope we developed is a radio telescope, which is fundamentally different from this telescope. It is firmly fixed in a suitable place like a cauldron. ”

"Oh, I see, then will it be placed in Beiqi City?"

"No, because it's too big to be placed in a densely populated area. Moreover, from the perspective of astronomical and geographical factors, it should be placed in the southwest of the motherland. ”

Li Mengmeng's heart couldn't help sinking: "In this way, wouldn't it be very inconvenient if I visited it?" ”

Liu Xiaoguang smiled: "Our Tianyan is first used for scientific research, not as a scenic spot for ordinary people to visit. ”

"Ahhh Could it be that it will prohibit visits? ”

"Most of the time it does, but it's open to the public at certain times, like this telescope."

Li Mengmeng's heart moved: "So, I can go through the back door?" ”

Liu Xiaoguang was stunned: "Whose back door are you going to go?" ”

"Of course it's yours, like now, isn't it borrowing your light?"

Liu Xiaoguang couldn't help but smile bitterly: "This telescope belongs to our unit, so naturally we can let you go through the back door, but the radio telescope we are developing belongs to the state, and I don't have the right to let you go through my back door." ”

"Oh, is that true?"

"yes, I'm afraid I won't be involved in the scientific research around this instrument at that time."

"Why is that?"

"Because it's to make way for younger, more energetic astronomers. After all, there are so many scientists and technicians involved in this project that it is impossible for them all to do the work around it. ”

Li Mengmeng hesitated, but smiled: "This is not bad, as long as you can retire, you can enjoy the life of ordinary people." ”

Liu Xiaoguang's eyes suddenly moistened: "If that's fine, I really envy the life of ordinary people." By that time, though, I'll probably be old. ”

Li Mengmeng was very emotional, and blurted out: "Don't be sad, there will be me then." I will accompany you and take care of you. ”

As soon as these words came out, not only did Liu Xiaoguang blush, but even Liu Ning, who was concentrating on observing the stars in the sky, also cast a strange look at her.

Li Mengmeng knew that she was 'speechless', and she couldn't help but throw her pretty face aside.

Liu Xiaoguang hurriedly focused his attention on his son: "Ning Ning, what did you see?" ”

Liu Ning's eyes became excited: "Dad, I saw a lot of magical stars. They're all beautiful. ”

Li Mengmeng took the opportunity to say: "Really? Can you let me share that? ”

Liu Ning took the initiative to give up his position: "Sister, please take a look." ”

Li Mengmeng witnessed the wonders seen from this astronomical telescope, and while marveling, she couldn't help asking: "Brother Liu, how far can our telescope see the stars?" ”

"Stars that are tens of light-years old can still be observed."

"Oh, what about the super telescope you've developed?"

Liu Xiaoguang smiled confidently: "Its observation distance is at least ten times that of this astronomical telescope, and the resolution clarity is also ten times, and it can even discover and study dark matter in the universe." ”

Li Mengmeng was curious: "What is dark matter?" ”

Liu Xiaoguang replied: "Dark matter is a substance smaller than electrons and photons, has no electric charge, does not interfere with electrons, can pass through electromagnetic waves and gravitational fields, and is an important part of the universe. Dark matter is very dense but in large quantities, so its total mass is large, and they represent 26% of the matter content in the universe, of which less than 5% of the total matter in the universe is visible to humans. Dark matter cannot be directly observed, but it can interfere with the light waves or gravitational pull emitted by stars, and its presence can be clearly felt. ”

Li Mengmeng continued to blink her curious eyes: Is there any practical significance in studying those dark matter? ”

Liu Xiaoguang pondered: "Since it cannot be directly observed, it may be able to help mankind develop invisible people." ”

"The Invisible?"

Not only Li Mengmeng, but even Liu Ning also cast an ardent gaze.

Liu Xiaoguang smiled: "Yes, because there is dark matter in the universe, then the idea of invisible people is not a science fiction story." If humans convert to dark matter, they may disappear invisibly. In general, the vast majority of objects on Earth are made up of normal particles, i.e. atoms. However, in abnormal cases, it is also possible that some special substances are made of dark matter. We have investigated and analyzed the motion of dark matter in great detail, and the results show that the average speed of dark matter is as high as 3000 meters per second when it is thermally moving. At the same time, we find that the movement of dark matter has strong randomness, and the external environmental changes will not have the slightest impact on the motion of dark matter. From this point of view, once dark matter enters the human body, it will run around the human body like a headless fly, which will have a serious impact on the internal systems of the human body. Experimental results have shown that when the human body is completely converted into dark matter, the existence of the human body is like smoke, and it is impossible for others to recognize it. This theoretically achieves stealth, but from a practical point of view, it is still not very realistic. Local image, please re-upload itOf course, with the development of science, humans may one day be able to build invisible robots. The 'eye in the sky' that we have developed now allows us to study dark matter deeper in the universe. ”

Li Mengmeng and Liu Ning listened to Liu Xiaoguang's eloquent conversation, and their eyes showed expectation and yearning at the same time.

Li Mengmeng couldn't help but say excitedly: "What the future world will be like, it's unimaginable. I really hate that I was born early, and if I had been born decades or hundreds of years later, I would have been able to enjoy a more amazing life. ”

Liu Ning couldn't help but be fascinated: "I hope I can enjoy more life brought to us by technology in the future." ”

Liu Xiaoguang couldn't help but smile bitterly: "You can't say that." After many teenagers, life on our planet will no longer exist, and all scientific and technological achievements will be destroyed. ”

Liu Ning showed a surprised gaze: "Dad, is there really an end of the world?" ”

Liu Xiaoguang pondered: "From a dialectical point of view, there is no eternal substance in the universe. In the eyes of our astronomers, every moment in the universe, countless stars are destroyed, and at the same time, countless stars are born. ”

"Are they like the cells of our human body, which are constantly changing from old to new?"

"Pretty much the same, in fact, the microcosm and the macrocosm are unified. For us astronomers, we are not only studying the macroscopic universe, but also the microscopic universe. ”

Li Mengmeng couldn't help but interject again: "Then can you find a way to avoid the destruction of life?" ”

"Hahaha, the destruction of life is still far away. What do you have to worry about? ”

Li Mengmeng's face flushed: "I'm not afraid of death." But what I think is that if one day, we will be counted as ancients, but our descendants may be wiped out. For example, the dinosaurs that ruled the earth for hundreds of millions of years, how powerful they were at that time, it can be said that they were extinct when they were extinct. ”

Liu Ning disagreed at this time: "There was no science in the era of dinosaurs. Therefore, no matter how strong they are, they cannot resist the disasters brought by nature. ”

Liu Xiaoguang nodded: "Well, Ning Ning has a point. If we humans could rule this planet for hundreds of millions of years like the dinosaurs, the level of technology at that time would certainly not be the same as it is now. Perhaps, we can really use all the cosmic discoveries to find a way to perpetuate life and civilization. ”

Li Mengmeng couldn't help sighing: "The age you said is really too long. Can't we take a shortcut? ”

Liu Xiaoguang said with a smile: "The level of science and technology on our planet is like this, if we can use high-tech astronomical telescopes to discover the life of other distant stars, we may be able to learn from the scientific and technological achievements of others." ”

Li Mengmeng's eyes lit up: "Yes, we humans have only existed on the earth for millions of years, and the emergence of civilization has been less than 10,000 years, and the level of science and technology has developed to this point." If aliens had been around for billions of years, we might have been able to learn more amazing technology. ”

Liu Xiaoguang nodded approvingly: "Mengmeng's imagination is very rich, so let's always carry such an idea." ”

"What's the use of just imagining? We also need you astronomers to bring us one surprise after another. ”

"We'll try. As astronomers, we need to go forward from generation to generation to reveal more mysteries of the universe for mankind and make these mysteries the fruits of higher technology in the future. ”

Liu Ning was already full of blood boiling by his father's words, and couldn't help but be angry: "When I grow up, I will become an astronomer." ”

Li Mengmeng suddenly stroked his palm: "Okay, there are successors to our country's astronomical cause." ”

Liu Xiaoguang glanced at his son with relief, and from his son's eyes, he couldn't read the slightest complaint and indifference to himself. This made him suddenly understand that the consensus of human beings on cosmic exploration and discovery has narrowed the distance between their father and son.