Reflections after reading A Brief History of Time

After reading a book, what do you feel? At this time, the most important post-reading experience cannot be forgotten. So how do you write a good review? The following is a 800-word review of a brief history of time that I carefully compiled (10 general articles). It is for reference only. Everyone is welcome to read it. After-reading of A Brief History of Time Part 1

We live in an extremely wonderful universe, and this vast universe hides many unknown secrets. Looking up at the night sky, how far away are those stars that look like points of light from us? No one knows, so what do we know about the universe? This answer may one day become as obvious as the earth's revolution around the sun. With this question in mind, I opened "A Brief History of Time", and a desire to read suddenly surged into my heart. In this book, questions that could not be answered before are now solved one by one.

The author of "A Brief History of Time" is Stephen Hawking. His representative works include "Hawking's Lectures - Black Holes, Baby Universe and Others", "The Universe in a Nutshell", etc. His life was a miracle both scientifically and medically. The book "A Brief History of Time" tells us about scientific issues in the universe. Its theme is the transformation of human space-time and cosmology. With our current science and technology, we are still unable to understand the true meaning of the universe. They just blindly speculate about the universe and think they understand the universe. In fact, the universe is very mysterious in everyone's mind, and no one can accurately tell the reasons for all the principles in the universe. Instead, things in the universe may one day provide answers to our unanswered questions. Time is planning these.

First of all, this book tells us that when we look at all things in the world, we must use science to solve them, and do not believe in superstition and heresies. Everything in this world has a certain value, and we should not treat it as "noble". See everything with your eyes. Just like flies can spread viruses in food, I don’t think anyone will agree that God created flies, but they are indeed a part of our earth’s creatures, and there must be a reason for their existence. We cannot do it because of ourselves. And depriving another creature of its right to exist, right? Secondly, it tells us that we should look at things with a scientific perspective, and we should also use scientific methods when studying. This book is about the secrets of the universe. It tells us that the highest state of science is often simple and easy to understand. Everything is very easy to accomplish with hard work. For example, if a company wants to recruit talents, a question comes up: What is one plus nine? Some people say: One plus nine equals ten is management, one plus nine equals one hundred is bribery. Some people are being clever and say that they want him to be equal to whatever they want. Only one young man answered ten, and finally he was hired. The purpose of this company's services is not to make simple things too complicated, and not to make complicated things too simple.

By reading the book "A Brief History of Time", I understood: in life, no matter what you do, you must think clearly before taking action, and you must believe in science and not fallacies. Let us remember Hawking and his "A Brief History of Time", and let us remember our deepest feelings! A Brief History of Time, Part 2

A good book can not only teach others knowledge, but more importantly, it can make readers think and feel. This is what "A Brief History of Time" written by Mr. Stephen Hawking is like this. A good book that makes people think and feel. After reading it, I thought about it for a long time and understood the philosophy in detail, which was refreshing.

In this book, Professor Hawking attempts to explain advanced physics knowledge in an easy-to-understand way, so that most people can understand it. Even so, this book seems to be somewhat difficult. In this book, he leads readers to travel through the strange realm of outer space, giving an in-depth and easy-to-understand introduction to distant galaxies, black holes, quarks, "flavored" particles and "spin" particles, antimatter, and the "arrow of time". It explains ancient issues such as what the universe is like, space and time, and the theory of relativity, allowing readers to initially understand the mysteries of cosmology such as special relativity, time, and the origin of the universe.

When reading books, you have to admire Professor Hawking's silky and meticulous logic. You will find that his extraordinary intelligence is revealed between the lines. He can vividly use the theory of relativity as a ping pong ball in the hands of a child. Describe the physical rule that time and space cannot be separated in the theory of relativity.

One of the great achievements in the book is the study of black holes. Black holes were originally predicted by Einstein in his book "The Theory of Relativity". He hypothesized that if there is a space with a very large curvature, the escape velocity of objects is very fast. So fast that not even light can escape such a space. Then such a space can be called a "black hole". But he believes that since even light cannot escape a black hole, then we cannot observe it. It is indeed a very black hole. But Hawking combined Einstein's theory of relativity and quantum theory and proposed that a black hole is not actually "black". It can emit positive and negative particles, and it also has a very high temperature. Precisely because the positive and negative particles it emits annihilate each other, it is difficult for us to observe it. Black holes radiate energy at an extremely high speed. When the energy is exhausted, a local area or the entire universe will collapse at the big squeeze singularity like the Big Bang, and then die.

The author of "A Brief History of Time", Stephen. Professor Hawking is such a giant of time. Hawking's life is very legendary. In terms of scientific achievements, he is one of the most outstanding scientists in history. His contributions were made while he was confined to a wheelchair for 20 years due to Lou Gehrig's disease. This is truly unprecedented. He made great contributions in astrophysics. Hawking used his imprisoned body and his strong and unyielding will to swim in the universe. With his wisdom, he challenged the truth and made great contributions to the progress of mankind.

In addition to sighing at the huge scientific information that Professor Hawking brought me, I also admire his spirit of daring to question, dare to imagine, and dare to demonstrate. This spirit is what we should focus on protecting in the process of educating and guiding students. We must not stifle children's imagination and curiosity intentionally or unintentionally. This book, whether we can understand it or not, will always benefit you a lot. Pick up the book and wander around in it, you will feel happy! A Brief History of Time Review 3

A famous person said: "What exactly is time? No one asked me, I know, someone asked I wanted to explain it to him, but I was at a loss. "There is a group of scientists who are constantly striving for the mystery of space and time. Among them, the most famous is Hawking. I think he is famous because he is a wise man with a physical disability and a strong will.

Hawking contracted Lou Gehrig's disease in his twenties and was confined to a wheelchair. Later, he contracted pneumonia and underwent tracheal surgery, which deprived him of the ability to speak. But he did not get depressed because of this. Although he could only move three fingers on his body, he used his astonishing and unconstrained imagination to boldly put forward the greatest cosmology theory at present and solved many mysteries of the universe.

"A Brief History of Time" is Hawking's book. In the book, Hawking made an authoritative summary of the nature of time and the origin of the universe. His theories and ideas have become milestones in the field of science. Because it is too esoteric, I chose a version that everyone can understand to briefly explore Hawking's works.

In "A Brief History of Time", many contents are just hypotheses, but this is different from the hypothesis in life. This is a hypothesis that can be boldly proposed only with certain scientific basis. However, I still struggled to read. Each chapter is only a small page, but understanding it requires more than a mountain of knowledge. Originally, I thought that this post-reading review should be one question per line. The whole page is full of question marks. Although it is enough to prove that I have read "A Brief History of Time", I decided to keep it simple and pick one that I like and have my own opinions. Let’s talk about the content.

Regarding the origin of the universe, the book says that the universe was once a very small, dense, and very hot spot. After the explosion, the temperature gradually decreased until it is in its current state. However, the universe is still constantly evolving. The earth is expanding. The book also says that this is a closed universe with limited space but no boundaries, just like the earth. The book also talks about scientists' speculation on the process of the Big Bang, mentioning neutrons, protons and other scientific terms that I have only heard people mention. I could barely read it, but how much I could understand was another matter. I couldn't question what I didn't understand. However, it was also mentioned that the temperature was above one billion degrees Celsius. After the big bang, the temperature quickly dropped by about one million degrees Celsius. I only know that temperature is measured with a thermometer, and thermometers are made using the principle of thermal expansion and contraction of liquids. In fact, I just questioned whether there is a liquid that can measure temperatures of more than one billion. Wise scientists such as Hawking are How to judge.

I was shocked that Hawking could navigate this scientific world where there are only guesses and very few proofs without getting lost.

Anyone can make a guess. I have a guess about the Big Bang of the universe, but it is just a guess.

First of all, for the explosion of a point, if you enlarge the point into a ball and then let it explode, if there is no gravity, it will continue to extend outward. At this time, you will find that if the place surrounded by debris is The universe, as it expands, will become sparse, so the space where the universe was born - according to the book, is blank, wouldn't it be exposed over time? At the boundary of the universe , two points that were originally very close will become farther and farther apart as they expand. If the expansion continues endlessly, as the density of the universe becomes smaller and smaller, won't the universe merge into a blank space? < /p>

Some people say that reading "A Brief History of Time" is difficult to understand, but when I read "A Brief History of Time", I was just reading a science fiction novel. I couldn't understand it at all, so it didn't matter whether it was difficult to understand or not.

Human life is limited, but knowledge is infinite. With my current knowledge base, I am not even qualified to listen to the master’s teachings. From now on, there is no other way but to continue to learn and supplement knowledge.

I hope that after a few years, through continuous efforts, when I pick up the original version of "A Brief History of Time", I will understand more than I do now. After reading "A Brief History of Time" Part 4

The title of the book I chose to read is "A Brief History of Time". Stephen Hawking's world-best-selling "A Brief History of Time" has become a milestone in scientific writing. This is due not only to the author's captivating delivery but also to the awe-inspiring themes he discusses: the nature of space and time, God's role in creation, the history and future of the universe.

In addition, Hawking wrote in the book that the birth of the universe originated from an unprecedented big bang. The big bang happened about 14.6 billion years ago. Since then, space and time have existed, and space and time are * **Birth**Death. About 5 billion years ago, the sun was born, providing a favorable guarantee for the birth of life on the earth. About 4.6 billion years ago, the earth was born. Only then did humans appear, and only then did all prosperous and civilized places exist. According to astronomers' observations, near-Earth stars are moving away from our earth. What does this mean? It means that the universe is constantly expanding and expanding. One day, the universe may shrink and gradually become a point, and time and space will be wiped out and reduced to nothing. Of course, this is a bold guess based on "the extremes of things must reverse", which may be a bit ridiculous, but this is something for later, let's not talk about it for now, let time test everything! The most important thing right now is to seize the opportunity and build the big family of the world. , to withstand all possible unexpected changes.

Secondly, I think nothing in the world is perfect. For example, some laws have been discovered by us, but more are still unknown things. Whether there are absolute rules in the world or it is just a coincidence. We still don’t know. But as time goes by and people continue to explore It is possible to solve these mysteries one by one. And for us, the inspiration it gives us is that there is no best, only better. Just like learning, it is like sailing against the current. If you don’t make progress, you will retreat. You can’t learn. Reach the highest peak, because there is no highest peak. All you have is to constantly compete with others and compete with yourself. Only in this way can you achieve good results in your own studies. The same is true at work. Successful companies have a strong sense of competition. Now it is survival of the fittest. They compete in order not to be eliminated, which will also lead to the rapid development of society and kill two birds with one stone.

What I admire most is Hawking’s great spiritual character. He suffered from sclerosis in his early years, resulting in paralysis. For decades after that, he had to rely on a wheelchair to live, and even relied on computers and speech synthesizers for help. I remember he once said: "My fingers can still move, and my brain can still think; I have ideals that I will pursue throughout my life, and I have relatives and friends who love me; by the way, I still have a grateful heart. Heart." What a heartfelt statement of love for life! He is a giant among physicists, and a role model for thousands of young people to learn from! A Brief History of Time Chapter 5

This winter vacation, I read "A Brief History of Time" by scientist Steve Hawking.

After reading the whole book, many questions have been lingering in my mind.

Did the universe have a big bang? Was the universe once an infinitesimal point? Is the universe expanding infinitely or will it eventually collapse? Is the universe infinite or has an end? Is general relativity correct? Can humans invent a time machine to go back to the past or to the future? Where in the universe can humans reach the farthest point? What exactly is a black hole? What is the smallest part of matter?

Maybe you can give a "satisfactory" answer to all these questions now, but who knows, the answer you give may be like falling from the Leaning Tower of Pisa. The "truth" that two iron balls of unequal weight did not land at the same time may only be recognized by people under the circumstances at that time, but with the development of science and technology and the progress of mankind, more Galileos will come forward. Let me tell you that this is not the case; more Hubble telescopes will also show you that the universe is really not what you imagined. At this time, you may be confused. What is the truth? No one can To give you a satisfactory answer, everything must be left to time.

Finally, from this book, I deeply understand that many major developments in science are due to many great scientists who do not blindly follow them, but have their own thoughts and opinions, and sometimes He even risked his life to put forward the theory. First of all, we should be grateful that we have caught up with such a good era and have such a good environment to study, expand our knowledge, broaden our horizons, and cultivate our abilities. Secondly, we should make full use of such conditions to study hard. In terms of learning, we should not blindly follow the rules and regulations in the textbooks, but should bring our own thoughts and opinions. We should also ask teachers for advice. After all, teachers have richer knowledge and experience. At the same time, while studying at school, we should also gradually enter the society, feel the society, and understand the society. This can also give us a more realistic sense of competition and cultivate our ability to think about problems in many aspects, that is, the cultivation of innovative thinking.

The physical misfortune made Hawking experience hellish suffering. However, he used his tireless scientific spirit to create a human paradise in his own region. This is a great blessing among misfortunes, as Hawking himself said: "Fortunately, I chose theoretical physics, because it is enough to study it with my mind." This proves John Milton's famous saying: "The mind is his own residence, in which he can create the sky of hell and the sky of hell." Heaven and Hell."

Let us remember Hawking and his "A Brief History of Time", and let us remember our deepest feelings. After reading "A Brief History of Time" Part 6

During this winter vacation, I read "A Brief History of Time" by the famous scientist Steve Hawking.

After reading the whole book, many questions have been lingering in my mind. Did the universe have a big bang? Was the universe once an infinitesimally small point? Is the universe expanding infinitely or will it eventually collapse? Is the universe infinite or has an end? Is general relativity correct? Can humans invent a time machine to go back to the past or to the future? Where in the universe can humans reach the farthest point? What exactly is a black hole? What is the smallest part of matter? ...

Perhaps you can give a "satisfactory" answer to all these questions right now, but who can understand that the answer you give may be like looking up from the Leaning Tower of Pisa? What is the "truth" that the two falling iron balls of unequal weight landed at different times. It may only be recognized by people under the circumstances at that time, but with the development of science and technology and the improvement of mankind, more Galileos will stand up and tell you that this is not the case; there will also be more Hubble telescopes to show you It shows that the universe is really not what you imagined. At this time, you may be confused about what is the truth. No one can give you a satisfactory answer. Everything must be left to time.

In the end, from this book, I deeply understood that many major advances in science are due to many great scientists who do not blindly follow authority, but have their own thoughts and opinions. Sometimes they even risk their lives to come up with their theories. First of all, we should be grateful that we have caught up with such a good era and have such a good environment to study, expand our knowledge, broaden our horizons, and cultivate our abilities.

Secondly, we should make full use of such conditions to study hard. In terms of learning, we should not blindly follow the rules and regulations in the textbooks, but should bring our own thoughts and opinions. We should also ask teachers for advice. After all, teachers have richer knowledge and experience. At the same time, while studying at school, we should also gradually enter the society, feel the society, and understand the society. This can also give us a more realistic sense of competition and cultivate our ability to think about problems in many aspects, that is, the cultivation of innovative thinking.

The physical misfortune made Hawking experience hellish suffering. However, he used his tireless scientific spirit to create a human paradise in his own region. This is a great blessing in misfortune, as Hawking himself said: "Fortunately, I chose theoretical physics, because it is enough to study it with my mind." This proves John Milton's famous saying: "The mind is the residence of his own self, in which he can create the sky of hell and the sky of hell." Heaven and hell."

Let us remember Hawking and his "A Brief History of Time", and let us remember our deepest feelings. A Brief History of Time Chapter 7

The scientific masterpiece "A Brief History of Time" created by the British physicist Stephen Hawking, includes black holes, the origin and destiny of the universe, cosmic images, space and time, expansion of the universe, In order to optimize the effect of science popularization, Hawking introduced relevant knowledge such as distant galaxies, particles, black holes, and antimatter in as easy-to-understand language as possible, and elaborated on the origin of the universe, space and Classic propositions such as time and relativity.

After reading this book, I found that although Hawking has tried his best to describe it in simple and easy-to-understand language so that more people can understand it easily, there are still many places that are difficult to understand, and you will find that The college physics we have studied can lay a solid foundation for understanding some of his problems to a large extent, which is of great benefit to our understanding of this book.

After reading "A Brief History of Time", I was most impressed by the following three aspects: First, the theory of singularity. In this theory, it is believed that before the Big Bang, the entire universe was condensed into a point, and this point is called a singularity. It is considered to be the beginning of this universe. This singularity was calculated by Hawking and another scientist Roger Penrose using mathematical calculations. The two of them founded the mathematical structure theory of modern cosmology. The second aspect is the boundaryless universe model. Combining general relativity and quantum mechanics, Hawking proposed a finite and boundless universe. How should we understand this model?

Take the earth as an example. It is limited, but when we keep moving in one direction on the earth, we will never reach the end. This is the embodiment of no boundaries. Third, black holes radiate. The greater the mass of an object, the greater its gravity. Generally, when a star ages and shrinks to a state where its size is very small but its gravity is very strong due to gravity, it forms a black hole. However, matter with temperature will emit particles, but the gravity of a black hole is very strong, how can particles escape? Regarding this contradictory issue, Hawking believes that black holes also emit radiation, but the radiation is not emitted from the inside of the black hole, but from the edge of the black hole, the empty space at the edge. The negative ions produced there will be absorbed by the black hole, but some positive ions with better luck can escape the black hole. We who are outside will find that black holes emit radiation. This radiation is also called Hawking radiation.

These scientific theories have greatly enriched my extracurricular spiritual life and increased my interest in science. I believe that inspired by "A Brief History of Time", more people will become passionate about it. Science and love of exploration. After-reading "A Brief History of Time" Part 8

This summer I finished reading one of Hawking's masterpieces - "A Brief History of Time".

"A Brief History of Time" is a book about cosmology written by the great British physicist Stephen Hawking. It mainly introduces to people what cosmology is, how the universe was formed, as well as various stars and cosmic phenomena in the universe. At first I thought this book must be very difficult to understand, and one must have strong scientific literacy and a lot of astronomical knowledge to understand it. As I read more and more deeply, I found that there is not a single tricky mathematical or physical formula in this book. It only uses sentences that ordinary readers can understand, and gives examples that everyone knows. It explains the profound mysteries of the universe in simple terms and elucidates some of the oldest questions.

A Brief History of Time is an unparalleled work of science in the last century. It is worth reading carefully and can increase everyone's knowledge and talents.

After reading this book, I felt deeply and became familiar with some basic cosmological knowledge. And I even made bold speculations about the future of the universe. In this book, the author proposes that both time and the universe have a beginning. Hawking proposed that there was a Big Bang in the first month of the first year when time began, and the universe was formed. And time began 15 to 20 billion years ago, plus some scientists say that we are in the middle age of the universe. So, I began to make bold speculations. The age of the universe should be 300 to 400 years, and the universe is still 15 to 20 billion years away from destruction. I also think that the universe will explode in the form of an explosion when it is destroyed, and will eventually return to a point state, and at the same time time will also end. However, the universe will still be reborn after its destruction, which means that human beings will also develop again and continue to reincarnate according to this law. In the book, Hawking also proposed that the universe is an object with infinite density and finite volume. Through studying physics, I know that density = mass divided by volume. Since the density is infinite, the volume is finite. So, from this I infer: the mass of the universe is infinite. And there should be objects outside the universe, and the universe is just a part of them.

In fact, these are just some of my feelings and inferences after reading this book. In the eyes of real physicists and astronomers, they are probably just some after-dinner jokes. But this book not only increased my knowledge about the universe, but also increased my imagination. The conclusion is not important. What is really important is that only when human beings have the spirit of constant guessing and exploration can science develop step by step and continue to develop. Go beyond the present and move to a higher level. After reading "A Brief History of Time" Chapter 9

After listening to "A Brief History of Humankind" and "A Brief History of the Future" in the Himalayas, the system automatically recommended Hawking's "A Brief History of Time". After trying to listen to three chapters, I unexpectedly found that the book is written in a simple and profound way, giving a very concise and concise description of a topic that I thought was mysterious at first, which opened my mind. To say that I can fully understand it is to deceive myself, but it does make people gain a lot of knowledge and understand some classic theories of modern physics. I just skipped and listened to some difficult chapters at the end, especially the part about elementary particles, quarks, which was like reading a book from heaven, but I finally finished it without hesitation.

I think of a point made by the author of A Brief History of the Future, that is, the religion of the future must come from science. In fact, in the book "A Brief History of Time", many discussions about the origin of the universe can be said to have risen. At the level of philosophy, what we are exploring is basic philosophical propositions such as where our world comes from and where it is going. Of course, there is no discussion about consciousness here. It is just a discussion from the macro of the physical universe to the micro of particles, which also involves a lot of science. content of history.

Essentially, this is a popular science book that introduces people to some cutting-edge theories of physics, but there is no mathematical deduction (if there was, it would be a book from heaven). Moreover, most of the content in the book is limited to the author's research field. The string theory studied by Sheldon in the American TV series "The Big Bang Theory" is not mentioned in the book (string theory should have been born after A Brief History of Time).

Let’s talk about a small detail in the book: An important basis for the Big Bang theory is that astronomers have observed that almost all stars are accelerating away from us. So how was this observed? In fact, it is based on a very simple The frequency change of the wave source in motion (the sound of the whistle will become sharper when the train is approaching you from far to near) is also called the Doppler effect. Since the planets are accelerating away from us, does it mean that the earth is the center of the universe? The author gave a very vivid metaphor: an inflated balloon. From every point on the balloon, other points are moving away from itself. .

For the rest of his life, Hawking could only sit in a wheelchair and rely on a machine-synthesized voice to express his opinions and predictions to people, such as warning people not to try to communicate with aliens by sending radio waves into outer space. Liaison (the award-winning work "Three-Body" by Chinese science fiction writers describes similar laws of the cosmic jungle and the consequences of doing so); also warned that the evolution of robots far exceeds the rhythm of biological evolution and may eventually replace humans...

Now that Hawking is gone, perhaps God is afraid that he will reveal too many secrets.

A Brief History of Time Chapter 10

In fact, I only have some vague impressions about Hawking, such as "Motor Neuron Disease", "Black Hole", and ""A Brief History of Time"", but in the end he was a researcher I don’t know what direction it is in, and I don’t know what major research results he has. I probably can’t understand it either.

But Hawking passed away.

I don’t know Hawking at all, but I feel that this is a great loss for physics. I know that there are many people like me who don’t know Hawking very well and feel the same as me. I think of the brief history I borrowed from the library and only read a little bit of it. I think of the many times I borrowed your name for compositions and mentioned that I want to learn from you how not to surrender to the arrangements of fate. I think of the Big Bang theory of where the universe will expand from one point. It’s the end. I think about whether your predictions in the media will come true. I think about the constraints of you being paralyzed in a wheelchair and where your free thoughts will go. I think about people saying that you are not qualified to be pregnant if you don’t know everything. I just want to give this group of ignorant people a blank look. I obviously don’t understand anything, but I still feel a little sad and regretful that you are leaving. This is probably the greatness of Hawking.

Science is different from literature. Literature is close to the public and can be read by opening a book. However, science is not. Science always maintains a sense of distance from the public. The public feels more about science and technology news they see. It is unclear, which makes scientists unfamiliar and distant in the eyes of the public, but not Hawking. The popularity of Hawking's "A Brief History of Time" among teenagers is almost as popular as that of "A Brief History of Time" in early childhood. Side by side with "One Hundred Thousand Whys", he successfully promoted science to the public, and the public will remember him forever. He will never appear in The Big Bang Theory again. I am very curious about who the next scientist will be to guide humanity forward.

I know nothing about advanced physics knowledge, but I still appreciate everything he has done for science. Without these creative people, we might still be in the agricultural age. Thank you to all scientists. , whether it is theory or practice, thank you for letting us look forward to a better future

Although the death of many celebrities has been sad before, the departure of Mr. Hawking really makes me sad, just like an elder It's the same as the departure of an idol.

A great scientist is probably also a philosopher. Hawking must be like this. After experiencing so much, he is probably not afraid of death. For Hawking, death may mean relief and release. We should Be happy for him that he finally doesn't have to be bound by his body anymore. When you think of him, look at the stars, he will always live there.