After savoring a famous book, you must have a lot to share. You might as well sit down and write your thoughts after reading it. But how to write the post-reading feeling is appropriate? The following are my thoughts on A Brief History of Time (7 articles in general), which I have carefully compiled, hoping to help you. Comments on A Brief History of Time 1
This winter vacation, I read a book called A Brief History of Time, whose author is the most intelligent person in the world-stephen hawking, a disabled scientist.
this whole book is all about the knowledge of the universe, and it also involves time. Its greatest feature is that at the back of the book, it also introduces several famous scientists: Einstein, Galileo and Newton, great men who have made great contributions to cosmology. The whole book tells us the image of the universe and the relationship between the universe and time. One of the most attractive is the mystery of black holes. A black hole is made up of a large mass, a high density and a strong gravitational field that can keep light from escaping.
after reading the whole book, I think science is very important. People's life can't be separated from science, because science can make human life happier and better. Without science, there would be no fast and convenient transportation, no room with constant temperature in all seasons, and no interesting games without science ... Now all the signs say "Chinese Dream, My Dream", and the basis of these "dreams" is science.
I remember that there is a sentence in the general preface of the book, "There is no scientific' education', but it is to cultivate faith, not education. People who have not received scientific education can only be called trained, not educated. " I think it's exactly right. If education is a bus that enables people to acquire knowledge, science education is a private car that enables people to acquire knowledge.
Hawking's spirit of self-improvement, bold exploration and bold reasoning is worth learning. I recommend you to read A Brief History of Time, and I believe you will feel the same way as me. Reflections on A Brief History of Time 2
The universe has gone to extinction after numerous explosions; Through countless explosions, it left a remnant nucleus and was reborn.
In A Brief History of Time, Hawking tries to explain popular science knowledge such as black holes, the origin and fate of the universe, black holes and time travel, explosion and rebirth in a way that ordinary people can understand, which completely changes people's ideas about physics, the universe and time itself, and shows people the most important scientific ideas about the universe at present.
This book reminds me of many things, the formation of everything in the world, the process and cycle of the initial form of human beings and various animals and plants-growth-development-decline; Just like grass, you can see all kinds of grass in every corner of the world. They will wither, yellow and even die in winter. However, every spring, we can see the green grassland again, which is the fulfillment of an ancient poem: wildfire never quite consumes them, they are tall once more in the spring wind. Imagine this is not a kind of rebirth after death?
On the earth, each of us is just as small as a grain of sand; In the whole solar system, the earth is just one of thousands of planets; In the universe, is the solar system just a small one, and where is our human position?
Everything that returns to the earth, whether it is people or plants, will come to an end and be replaced one day. Because the universe is irregular, it is precisely because of the irregularity of the universe that the present solar system, the present earth, the present human beings and the present beautiful life exist. The vast universe, the vast firmament, we are not just a speck of dust, but a dust that has its own defects and needs to communicate with each other. And the world is not perfect, no matter how we treat ourselves or their mistakes, all we can do is to be more tolerant and less blamed with a humble heart, because we all live in an irregular universe and we need to understand each other!
Talking about the beginning of the universe reminds me of a short video I once watched. What we humans see, hear, touch and feel in the short film is gone. At first glance, we may think that this statement is surprising and noisy, but it is not.
We all know that all human sensory systems are controlled by the brain, just as what we see and hear is transmitted from our nervous system to our brain tissue, and then our brain tissue displays what we see and what we hear. Imagine taking out a person's brain tissue, and then connecting its auditory system and visual system with our computer prepared in advance. Does the picture in the computer appear in the visual system of this brain at the same time? If we play the music prepared in advance in the computer, will the brain auditory system hear the same music at the same time? All this is really incredible. If we continue to observe, we will find that if we cut off the visual system and auditory system connected to the computer, can we still see pictures and hear music in our brains at this moment? The answer is very clear, no. The formation of these clear pictures and sounds is precisely with the help of trace elements.
The universe is made up of trace atoms that expand rapidly until they explode, and then under the action of universal gravitation, the remains of the same elements after the explosion are attracted together. Thousands of explosions and repeated gravitational effects have created today's universe, galaxies, earth and human beings.
In this way, it is not difficult to imagine that the rebirth after death will be more exciting. So is the solar system, so is the earth, and so is mankind. But it was a long time ago. Perhaps by the time the life of the earth and the solar system ends, mankind has found another planet to live on. Now human beings are only the rulers, occupiers and users of the whole earth. By that time, human beings will become the rulers of another planet and even the whole universe.
What Hawking has shown me may be considered alarmist by some people, but time will be a fair judge. However, in a short period of time, the only planet on which we can live is the earth, and we can't catch up with time and beyond space. What we can do is to cherish our present home, cherish our time and life, and treat every day as the end. That way, even if tomorrow is like the end of the world described in the movie "213", we can take it calmly.
Finally, considering our college students in the 21st century, we should be glad that we have caught up with a good era and have such a good environment to study, expand our knowledge, broaden our horizons, activate our thinking and cultivate our abilities. Then what reason do we have to languish in the face of a little setback, and what reason do we have to waste our youth in front of precious time? Hawking, who is physically and mentally disabled, not only struggled with disability for 2 years, but also devoted his superb wisdom to scientific research and completed difficult scientific research with extraordinary perseverance. I can't help but say that God is fair to everyone. Hawking has physical defects, but his mind is very clever! His contribution to the scientific community far exceeds that of a normal person. If a person is physically disabled, he must never be mentally disabled. Although God is fair, life is unfair. No matter what your situation is, you can only go all out with your enthusiasm. These Hawkins did it! And we should make full use of such good conditions to study hard, break the limitations and ask for knowledge with our own thoughts and opinions. Don't be ashamed to ask questions, expand your hobbies and improve your thinking. At the same time, we will gradually enter the society, feel the society and understand the society, enhance our sense of competition and cultivate our ability to think in many ways, that is, the cultivation of innovative thinking.
A good book not only enables people to acquire the latest knowledge, get the edification and cultivation of scientific ideas, scientific spirits, scientific attitudes and scientific methods, but also enables readers to think and feel. A Brief History of Time is such a good book that makes people think and feel. As for the author of this book, Mr. Hawking, I am even more impressed by his personality charm. His life is very legendary. In terms of scientific achievements, he is one of the most outstanding scientists in history, and his contribution has a far-reaching impact on human concepts. However, his contribution was actually made when he was confined to a wheelchair for 2 years. This is the real miracle-he will become impossible. The misfortune of his body made Hawking feel the torment of hell, but he created a paradise for mankind in his own region with his tireless scientific spirit. Hawking not only conquered the scientific community with his achievements, but also conquered the world with his tenacious fighting spirit.
Let us remember Hawking and his A Brief History of Time, and let us remember our innermost feelings. Comments on A Brief History of Time 3
The title I chose to read is A Brief History of Time, stephen hawking's best-selling book in the world, which became a milestone in scientific narration. This is not only due to the author's charming expression, but also to the awesome themes he discussed: the nature of space and time, the role of God in creation, the history and future of the universe. However, in the years since it came out, some readers have been telling Professor Hawking that some of the most important concepts in this book are very difficult to understand.
A Brief History of Time tries to describe the universe as a finite but borderless space. It is completely self-sufficient, with no beginning or end, and it is existence. Time is described as follows: "The increase of disorder or entropy with time is an example of the so-called time arrow. The arrow of time distinguishes the past from the future and gives time a direction. There are at least three kinds of time arrows: the first one is the thermodynamic time arrow, that is, the disorder or entropy increases in this time direction; Then there is the psychological arrow of time, which is the direction in which we feel the passage of time, in which we can remember the past instead of the future; Finally, there is the cosmological time arrow, in which the universe is expanding, not contracting. "
In my understanding, time is an overly complicated concept. It can be abstractly described as a substance that accompanies us. Although it can't be captured, it does exist. It can also be materialized into all the substances around you. Maybe you can't find them, but they are really being changed by time. Knowing that there must be something affecting our lives around us, we can't see what it is after all. And time exists on its own, at least I think so now, although there is no time machine at present.
This reminds me of Einstein's theory that when an object reaches the speed of light, it can travel through time and space. If this is true, and one day someone proves that time is sent by something, we can have a time machine to travel back and forth. Everything is related to time. When there is no time, does matter lose its essential meaning? Maybe the existence of matter in time is just a way we choose, or something else is made for us. A world without time is a balanced world without continuity, because time and space are a whole and a chord on the coordinate axis. If one of them is lost, assuming it is the X axis, then the Y axis is meaningless.
We live in a world controlled by a certain time. Everything is dominated by time that never stops but operates with strict rules. Maybe it suddenly stopped in an instant and playfully played with us, but we didn't know anything about it. When time opened, we went on with our lives. It may be immortal, at least in the eyes of our short-lived substances, compared with the bright history of the development of the universe, it is indeed immortal. It produces a point in a specific time and space, so countless points are connected together, become lines, become planes, and weave indefinitely until the end of the universe. If the universe is not over, it will continue to weave immortally, which is the eternity that human beings can't touch.
In BIGBANG's theory, it is mentioned that the temperature dropped to 1 billion degrees after one second in BIGBANG, so what was the temperature before the explosion? After searching related information on the Internet, we know that the temperature before BIGBANG is 1 to the 32nd absolute temperature. This is the temperature proved by modern high-energy physicists. Although I can't understand this huge number and special unit, I feel how small I am.
In fact, the discovery of the Big Bang theory is an ordinary doctor. One night, when he was watching the starry sky at home, he suddenly thought of a problem. According to the law of universal gravitation, the stars in the sky should attract each other and get closer and closer, but why didn't people find the phenomenon that the stars were all together? So he suggested that there must be a kind of force to counteract the gravity between planets, so this is the first proponent of the theory of the expansion and diffusion of the universe.
Before the Big Bang, the universe was a primitive fireball with high uniformity and constant temperature, so it was a disordered state, which was contrary to the second law of thermodynamics. According to the research, after the Big Bang, the universe expanded 1 times at the minus 23 power of 1 per second. So how fast did the universe expand? It is about 1 to the 31st power meter/second. What is this concept? According to Einstein's theory of relativity, the speed of light cannot be exceeded. Only when a photon with a mass of is at rest can it reach the speed of light. What is the speed of light? One second is 3, kilometers, so it is 3 times 1 to the eighth power meter per second, which is the speed of light, and the expansion of the universe far exceeds the speed of light by billions of times. There is no way to know what happened within 1 35 meters per second at the beginning of the big bang.
Let's talk about the speed of BIGBANG, which can neither be fast nor slow. If it is slow, all the planets will be pulled back by gravity, and the whole BIGBANG will need to be adjusted to the 55th power of 1 to reach the speed needed for explosion.
Only truly knowledgeable astronomers know the fear of God, so many astronomers tell us that God has two books, one is the Bible and the other is nature. There is no contradiction between the two. Astronomers are very proud, because they study astronomy, so it is difficult to make them believe in God. But now, with the study of the Big Bang theory, more and more astronomers' beliefs have changed, and some scientists have obviously changed from atheism to theism.
After reading A Brief History of Time, I benefited a lot. Although Mr. Hawking expressed his views on time and space and the universe in a simple way, I still didn't understand many abstract concepts, let alone pretend to understand and distort the original intention, so let's talk about my understanding of time after reading the book here.
Our world, or the universe, is in a certain time string, but we don't know the other XYZ axes, because human beings can only feel four dimensions at most, and the universe is at least above four dimensions. This is also impossible to construct a model in my brain. We can only appear at this specific time, and there may be another world one second before us. There are countless worlds, but the time axis is different. We are in balance with them (if they exist) because everyone's time runs.