Chapter 1496: Hypothesis about the cause of the moon

Chapter 1531: Hypothesis about the cause of the moon
‘Haha, of course, everything is ready. The personnel, just the four of us, the equipment and materials is a flying saucer spacecraft. Zhao Zhongyao looked at Qu Yuqian again and said with a smile.
‘What, just the four of us! Didn’t you mean to find more than a hundred people! Now why are the four of us! Qu Yuqian said very puzzled after hearing what Zhao Zhongyao said.
‘What’s the matter, the four of us cannot go on a space travel adventure. Zhao Zhongyao looked at Qu Yuqian again and smiled.
Feifei and Tiantian both laughed when they heard what Dad said.
At this time, Feifei looked at her mother and said, ‘Mum, we are not going to the solar system to travel and explore, we are going to the moon to travel and explore. ’
When Qu Yuqian heard her son's words, she turned her head and looked at him puzzled, ‘how do you say that, aren’t we going to travel and explore the solar system together! ’
‘Haha, we are going to travel and explore the solar system. However, we are going to travel and explore on the moon first. Said Feifei.
'why? We are not going to explore the solar system. Qu Yuqian was very puzzled when she heard what her son said.
‘Mom, we are not going to travel and explore the solar system now, we must go to the moon to travel and explore first. After we have traveled and explored on the moon, then we will go to the solar system to explore with others. "Looking at my mother every day and said.
After hearing what Tiantian said, Qu Yuqian looked at Zhao Zhongyao very puzzled and said, ‘Zhongyao, what the is going on, tell me. ’
At this time, Zhao Luyao looked at Qu Yuqian again and said, ‘That’s right, we can’t travel and explore the solar system yet. Because we need to select personnel to travel and explore, but also prepare some equipment and materials, which will take at least a month.
But now that we have nothing to do, we can go to the moon to travel and explore first. After we have explored the moon tourism. You can travel and explore the solar system with the big army. ’
When Zhao Zhongyao said this, Qu Yuqian knew what was going on. After hearing what Zhao Zhongyao said, she said happily, ‘Okay, since this is the case, let’s go and see the moon first! It’s just that what’s so good about the moon, we don’t all know what the moon looks like. ’
Although Qu Yuqian is also willing to go to the moon. But she felt that there seemed to be nothing to look good on the moon. There is only one lunar city built by Feitian Group on the moon. Then there are no other human buildings.
‘There are still many places to visit on the moon. Although we have built a lunar city on the moon, we actually don't know much about the moon. This time, when we go to the moon, we are going to take a tourist expedition on the moon. Then on the moon, develop a tourist route.
The moon is so big, are we just letting tourists visit our lunar city? Why don't we take tourists to other places on the moon. Zhao Zhongyao looked at Qu Yuqian again and said.
After hearing what Zhao Zhongyao said, Qu Yuqian felt very reasonable. Because they don't actually understand the moon. We should still go to the moon. Look for something that can become a tourist resource. Then develop a lunar tourism route.
‘Zhongyao, what you said is very reasonable, we should go to the moon first. It’s just that I feel that there don’t seem to be any good tourist attractions on the moon. Even if we went there, we might not find good tourism resources. Although Qu Yuqian agreed with Zhao Zhongyao's point of view. But she is not optimistic about the tourism resources on the moon.
At this moment, Zhao Zhongyao looked at Qu Yuqian again and said, ‘Don’t you feel that there is nothing fun on the moon. Do you feel that you know the moon well? Then tell us about the astronomical knowledge about the moon! I see how well you know the moon. ’
When Zhao Zhongyao said this, Qu Yuqian didn't know how to answer. She looked at Zhao Zhongyao and said, ‘the moon is a devastated planet with neither air nor water on it. Even gravity is very small. It's totally different from our earth. Qu Yuqian said again.
‘Then can you tell me some more specific data! Zhao Zhongyao looked at Qu Yuqian again and said.
‘I can’t tell you this. I probably understood these things. Qu Yuqian looked at Zhao Zhongyao and said.
‘It seems that you don’t know much about the moon. Said Zhao Zhongyao.
After that, Zhao Zhongyao looked at Feifei and Tiantian again and said, ‘how are you two, do you know the moon very well?
After hearing what Zhao Zhongyao said, Feifei and Tiantian shook their heads together. After all, they both knew little about things on the moon. Although they had been to Moon City, they could tell them the whole situation on the moon. It can't be said.
‘Okay, since you still don’t know the moon, we should go to the moon to learn more. Just before going, I think I should give you a few lessons first, so that you can have a comprehensive understanding of the moon. Zhao Zhongyao looked at Qu Yuqian and the two children again and said.
‘Okay, then, dad, give us a lesson! Let us first have a comprehensive understanding of the moon. Feifei said, looking at his father again.
Qu Yuqian also looked at Zhao Zhongyao at this time and said, ‘Zhongyao, then just say it! We should indeed learn more about the moon. ’
Tian Tian also looked at Zhao Zhongyao curiously, wanting to hear what was new about the moon that they didn't understand.
‘Okay, then I’ll give you an astronomy lesson about the moon first! After finishing talking, Zhao Zhongyao thought about it for a moment, and then started talking again.
'The moon may have formed about 4.5 billion years ago. Shortly after the formation of the earth, there are several hypotheses about its origin. The argument supported by more factual evidence is that it was formed on a celestial body the size of the earth and Mars-"Theia "The theory of the origin of the big collision" formed by the debris generated by a huge collision between them, gathered on the periphery of the earth.
The full moon seen from the northern hemisphere of the earth is filled with huge impact craters filled with basalt lava flows from dark volcanoes on the front of the moon, forming a vast plain called the "moon sea", actually a drop of water in the "moon sea" nor. Bright, ancient plagioclase highlands and conspicuous impact craters are interspersed between the periphery of the Moon Sea and the Moon Sea.
It is the brightest celestial body in the sky except the sun. Although it is very bright white, its surface is actually very dark and its reflectivity is only slightly higher than that of old asphalt. Because the moon is very conspicuous in the sky, coupled with regular moon phase changes, it has had a significant impact on human culture, such as myths and legends, religious beliefs, philosophical thoughts, calendar compilation, literature, art, and customs since ancient times.
The moon's rotation and revolution have the same period, which is called tidal lock. Therefore the moon always faces the earth with the same side. The earth's ocean tides are mainly due to the moon's gravity. Because the tidal force of the earth’s oceans is opposite to the direction of the earth’s rotation, the earth’s rotation is always subjected to an extremely weak force to "brake" the earth’s rotation, which has been accumulated for a long time. There is sufficient evidence that the earth’s rotation cycle is increasing. The slower, the time of a day increases extremely slowly, about 1 second in a few years; due to the reaction force of the earth, the moon slowly gets farther and farther away from the earth, about 3.8 centimeters away from the earth every year.
The size ratio of the moon to the sun is similar to the distance ratio, making its apparent size almost the same as that of the sun. During a solar eclipse, the moon can completely cover the sun and form a total solar eclipse. Because the moon's rotation period is exactly the same as its revolution period, the only thing that can be seen on the earth is the moon facing the earth forever. Since the early formation of the moon, the earth has been under the influence of a moment to slow down its rotation speed. This process is called tidal locking. Therefore, part of the angular momentum of the earth's rotation is transformed into the angular momentum of the moon's revolution around the earth. As a result, the moon moves away from the earth at a speed of about 38 millimeters per year.
The origin of the moon is different. There are roughly three major factions about the origin of the moon in history. They are split theory, capture theory, and collision theory.
Split said. This is the first hypothesis to explain the origin of the moon. The split theory believes that the moon was originally a part of the earth. Later, due to the fast speed of the earth, part of the material on the earth was thrown out. These materials separated from the earth to form the moon, and the large crater left on the earth was the Pacific Ocean.
This view was quickly opposed by some people. They believe that it is impossible to throw out such a large piece at the rotation speed of the earth. Besides, if the moon was thrown out by the earth, then the material composition of the two should be the same. However, through laboratory analysis on the rock samples brought back from the moon by the "Apollo 12" spacecraft, it was found that the two were very far apart. The age of the rocks on the lunar surface is extremely old. The age of the rocks on the entire lunar surface is between 3 and 4.2 billion years. The age of the oldest rocks on the earth’s surface is limited to the 3.8 billion year old metamorphic rocks exposed in individual areas. The age of the rocks on the ocean floor is extremely young, completely contrary to the theory of "splitting theory".
Captured said. This hypothesis believes that the moon was originally just a moon-sized asteroid in the solar system. Once, because it traveled close to the earth, it was captured by the earth's gravity and never left the earth ever since. There is also a view close to the capture theory that the earth continues to accrete matter that enters its orbit. Over time, more and more things accrete, eventually forming the moon. But it was also pointed out that for a planet as big as the moon, the earth may not have that great power to capture it.
Collision said. This hypothesis believes that in the early evolution of the solar system, a large number of "stellar particles" were formed in the space of the solar system, first forming a celestial planetary planet equivalent to 0.14 times the mass of the earth. The planetary planets formed a primitive earth through collision and accretion.
During their respective evolutions, these two celestial bodies formed a metal core dominated by iron and a mantle and shell made of silicate. Since these two celestial bodies are not far apart, the chance of meeting is great. By chance, the small celestial body hit the earth at a speed of about 5 kilometers per second. The violent collision not only changed the motion state of the earth and tilted the rotation axis of the earth, but also caused the small celestial body to be broken by the impact. The silicate crust and mantle were heated and evaporated, and the expanding gas carried a large amount of crushing at a great speed. The dust flies away from the earth.
These materials that fly off the earth are mainly composed of the mantle of the collision body. Most of the earth hit by a huge impact is the mantle and crust material heated to evaporate, and the expanding gas carries a large amount of crushed dust away from the earth at a great speed. The metal core that separated from the mantle when the impactor ruptured was slowed down by the expanding and flying gas and was accreted on the earth within about 4 hours. The gas and dust flying away from the earth are not completely out of the control of the earth's gravitational force. They are combined through mutual accretion to form an almost molten moon, or first form a ring and gradually accrete to form a partially molten moon.
This version is generally recognized. This model clearly explains that the average composition of the moon is compared with the average composition of the earth. The moon is relatively poor in iron and volatile, and the density of the moon is lower than that of the earth. The isotope composition of certain elements that have the characteristics of the "gene" of the earth and the moon, such as the isotopic composition of oxygen, chromium, titanium, iron, tungsten, silicon, etc. The measured values ​​of the moon and the earth are consistent within the error range, indicating that the moon is The "daughter of the earth." For 4.5 billion years, the earth has been carrying its own daughter by its side, and the moon has always been with its mother, and has been through 4.5 billion years of long and unearthly times. Zhao Zhongyao looked at his wife and children, and talked about some things he knew about the moon.
Qu Yuqian and Feifei Tiantian heard what Zhao Zhongyao said, and immediately became curious about the moon again. After all, when they are not listening to these things, they feel that there is nothing attractive on the moon. But after listening to it, I thought of going to the moon to see it.
‘Zhongyao, listening to you say this, I really want to go and see on the moon. Qu Yuqian looked at Zhao Zhongyao and said.
‘Dad, let’s go right away! I really want to go on the moon and take a good look. I worked there for two months before, and I didn’t even go to see the moon! Feifei said while looking at his father.
‘Dad, let’s hurry to the moon! I also want to see what it looks like on the moon. Although I worked on the moon for two months, I didn’t seem to know the moon at all. ’He looked at his father and said every day.
‘Okay, let’s go right away. After hearing what his wife and children said, Zhao Zhongyao promised them that he would go to the moon immediately.
In this way, Zhao Zhongyao took his wife and children out of the house. Then came to the company headquarters. Zhao Zhongyao drives a flying saucer spacecraft. They took the flying saucer spacecraft together and flew to Lunar City again.