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What is the universe? What's in there? The ancient Egyptians believed that the universe was like a box, and Egypt was at the bottom of the box.
They also felt that the sky was a dark blue cloth covering the top of the box. The Chinese believe that the universe came from Pangu. The Israelites believed that it was Jehovah, the God, who created the universe, the earth, people, and all things in the world.
When I was younger, I thought that the universe was a river, that the earth and the sun were just houses on both sides of the river, and that the stars were sequins in the sky. The idea kept me wanting to explore other houses in the universe and fantasize about catching sequins from the sky and weaving them into a crown.
According to scientists' inference, the universe is a large space with hundreds of billions of galaxies, and the earth we live in is in the solar system, and each galaxy has about 100 billion stars. There are about 100 billion solar systems in the entire universe that have been observed so far. We live in the middle of the solar system where the sun is located, and there are eight planets orbiting the sun, and each of these planets has moons orbiting around it.
The Sun is the closest star to us, about a minute from Earth, at the speed of light, which travels about 300,000 kilometers per second. There are still many stars in the Milky Way, but the current technology can still only see a small part of the universe, and I hope that with the progress of science and technology, we can understand the universe more deeply.
People often think they are great, and there are people who think they are the smartest people in the world and the most powerful people in the universe. From the perspective of the universe, human beings are not even inconspicuous little ants. Even if the Great Wall is very long, you can only see a little bit in outer space.
The universe is infinite, and it continues to expand, no one knows what the universe will become in the future, people should be more humble.
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You can read some books about the universe. Look at what they wrote.
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The upper and lower four directions are said to be the universe, and the universe has been famous throughout the ages.
"宇" refers to space, and "universe" refers to time.
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1. On the other side of the universe, if you want to write an essay about clouds, you have to close your eyes and imagine what clouds look like. Slowly turn yourself into a cloud, floating and floating in the air, and the higher you float, the higher your score will be.
The cloud changes like this: he sees that one of the old man's crutches is broken, so the cloud becomes a crutch to help the old man, and the score of the assignment will increase; It saw the wolf stealing the lamb again, so the cloud turned into a hound and drove the wolf away, and the score of the assignment increased.
The clouds drifted slowly through the trees, and it met the birds, the deer, and the earthworms ......I made friends with them. When I was writing, I encountered something that was not smooth, as long as the clouds floated over, it would be smooth. When you hear a whirring sound, it means that the clouds are looking up the dictionary for you...Signs.
2. On the other side of the universe, if you want to write an essay about clouds, you have to close your eyes and slowly turn yourself into a cloud.
When a little chick can't fly, I will turn into a pair of wings and let it fly freely; When a flower is about to be roasted by the sun and loses its beauty, I will use it as a sun umbrella to help it shade and restore its beauty, and I will also shade people, and everyone will give me a big thumbs up, and the more likes, the higher the score of the assignment.
I will also decorate the sky in various shapes; When a bird flies by, I turn into a pearly white feather; When a lark is singing, I slow down the rent into a note; When a flock of little sheep grazes on the grass, I also become a little sheep and play together. The more shapes, the higher the assignment score. I am a lovely cloud, a cloud that brings more joy to people.
There are three ways to imagine:
1. Imagine according to the characteristics of real life.
2. Imagine in the opposite direction.
3. Imagine yourself as something else.
Specifically. The first point is that imagination is inseparable from real life. It is to grasp the characteristics of life on the basis of real life to imagine. How do I live on this side of the universe? So the kid on the other side of the universe lives like this.
The second point, the so-called reverse imagination, is that I take out the book and put it down on the other side, and I go to the left and the other side to the right. This side of the stone has no life, but the other side of the stone will walk and bloom like a flower.
Third, imagine yourself as something else. For example, imagine yourself as the wind, the flowers, the bees, the clouds. Turning yourself into something like that and then imagining it again can achieve great imaginary results.
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The universe does not refer to the whole of all stars, but to the general term for the parts of space that can be observed by human beings today.
1. Stars, such as the solar system, are generally composed of a number of planets, moons, asteroids, comets, interstellar matter, etc., and the star is the basic unit of the cosmic star. The Milky Way alone has discovered about 200 billion stars.
2. Star systems, referred to as galaxies, such as the Milky Way, are composed of several stars, interstellar dust and gas clouds. Galaxies are the "islands" of massive stars in the universe, and it is also one of the largest and most beautiful celestial systems in the universe. So far, about 100 billion galaxies have been observed in the universe.
Some of them are closer to us and their structure can be clearly observed; Some are very far away, and the farthest system that can be observed by humans is nearly 20 billion light-years away from us. The Milky Way is in the shape of a vortex, with 4 spiral arms extending evenly and symmetrically from the center of the Milky Way. The center of the Milky Way and the 4 spiral arms are places where stars are concentrated.
From a distance, the Milky Way is like a large discus for physical exercise, with a diameter of 100,000 light-years, equivalent to 946,080,000,000 kilometers. The thickest part in the middle is about 3000-6500 light years. The Sun is located on a spiral arm called the Orion Arm, about 10,000 light-years from the center of the Milky Way.
The Milky Way is a medium-collapse galaxial system with a silver disk about 120,000 light-years in diameter. Its silver disk contains a large number of interstellar dust and gas clouds, which aggregate into reddish star-forming regions, thus constantly replenishing the spiral arms of galaxies with hot young blue stars, forming many open star clusters or galactic clusters. There are more than 1,200 known such evacuation groups.
The galactic disk is surrounded by a large galactic halo interspersed with stars and globular clusters composed mainly of older stars.
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There is the earth in the universe, and there are people in the earth.
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There are eight planets, the sun, and so on.
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Write as you like, rely on your own imagination, you can do whatever you want! Don't let the classroom tie your mind!
The universe is the unity of time and space, referring to all space-time systems that human beings have observed and have not yet observed, including everything in between. The overall explanation of this system constitutes cosmology.
In ancient China, there was a saying that "the upper and lower four directions are called the universe, and the ancient and modern are called the universe" (that is, the meaning of the universe is infinite space, and the meaning of the universe is infinite time), and the word universe also comes from "next to the sun and the moon, and the universe".
In recent centuries, scientists have established modern scientific theories about the universe based on modern physics and astronomy, called physical cosmology.
Some of the objects of the universe observed by humans are roughly made up of ordinary matter (the matter that makes up stars, planets, gases, and dust) or "baryons", dark matter, and dark energy. Baryonic matter forms the "cobwebs" of intergalacies
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