Human modern science has developed for hundreds of years. In this long history, many great scientists have been born. If you let you rank all scientists, who will the top two rank?
Perhaps everyone’s ranking is not the same. After all, there is no standard answer in this ranking, and the dimensions of the dimensions will be different.But in any case, you can’t ignore the names of these two scientists: Newton and Einstein.
In the eyes of many people, Newton and Einstein can be called the two greatest scientists in human history. They have made outstanding contributions to the development of human scientific science. The specific contributions are not detailed.That’s all gravity.
We all know that Newton has proposed the theory of gravity, so that humans know that there is gravity between all things for the first time, and gravity is also the fundamental reason why we can stand on the earth.
Now hundreds of years have passed since Newton’s theory of gravity, but this theory still rules our world. From the satellites, detectors, airplanes, trains running on the ground, cars, to the ocean to sail 10,000The tons of giant wheels, their movements are dominated by gravity.
The story of “Newton’s research on Apple’s landing” is also well -known. Although Newton discovered the process of gravity, it will never be because of one apple, the process will be very firm and complicated, but this story also makes us understand that many seemingly profound big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big big and esoteric big big big big big big big big big -lookingThe law of nature is actually around us, depending on whether we have a pair of eyes that are good at discovering, and more importantly, always maintain a curiosity and desire to explore.
Newton’s law of gravity is great, but he also knows that there is a fatal flaw in this theory: what is the essence of gravity?In other words, how is the gravity produced?
Of course, Newton himself knows that he has not given the essence of gravity. He also thought deeply about this problem, but he could not find the answer.Although Newton is great, no matter how great people are, they cannot break through the limitations of the times. This kind of limitations have any era, and it is difficult for anyone to break through.
Based on the scientific development level of New New era, Newton did not find that the essence of gravity was normal. The limitations of the times completely bound Newton’s thinking.
This arduous task was left to another great scientist, Einstein.
Einstein appreciated Newton’s description of the gravity, but he knew that this description was not satisfactory, because he wanted to know the cause of the gravity, how is the gravity generated?
It is difficult to explore the essence of gravity by scientific and cultural knowledge alone. This problem requires genius leaping thinking and imagination.On the basis of narrow sense of relativity, Einstein extended the inertia system to all reference systems, while boldly enabled the principle of inertia and gravity equivalent, and proposed a great general theory of relativity, thereby touched the essence of gravity.
The general theory of relativity is not difficult. Although it involves complicated mathematical calculations, for popular science work, we only need to understand the general theory of relativity in popularity.Although popularity often means that it is not rigorous, it is enough for popular science work, because ordinary people do not need too professional research and understanding.
Einstein emphasizes that the essence of gravity is actually bent in time and space.That’s right, our traditional thinking will think that time and space are absolutely unchanged and flat.But Einstein didn’t think so.He believes that space -time is not absolute, and time and space can bend, compress, and even tear like elastic fabrics.
Any object will feel a kind of invisible power to pull it in the bending space -time, and this power is gravity.
To put it plainly, the essence of gravity is the bending of time and space, gravity is only a complete appearance of time and space, and it can even be considered that gravity does not exist, and existence is only time and space bending.
However, the description of time and space bending on the Internet is actually not rigorous. Many times it is just a popular description. The purpose is to facilitate everyone to understand.Many pictures are described as bending time and space as heavy objects compressed elastic fabrics, but because there is no upper and lower concepts in space, “bending down” does not exist. So how to bend?
The direction of bending is towards the quality of the object, and at the same time, the movement of the object will also move the time and space to move together.
To put it simply, the object tells how time and space are bent, and time and space tells the object how to exercise.
Although the essence of gravity is time and space bending, we will not completely replace the gravity with space -time bending.Because the influence of ordinary objects on time and space bending is minimal, it can be ignored. Only the curvature of large quality celestial bodies on time and space is more obvious, so the gravity in daily life is already accurate enough, and there is no need to use more accurate time and space bending.
More importantly, the formula of the law of gravity is very concise, and the general theory of relativity is very complicated.Only when exploring the laws of large celestial bodies can scientists use broad theory of relativity.
