Na Linwan glanced around to see the fascinated children who were both comrades-in-arms and comrades and continued happily: "Actually, here, we have to face several facts to speak." First of all, because of the existence of time, space also exists. They exist simultaneously. If time can be turned back, there are several ways to examine time.
First, stop time. How to understand it? The period of time from a person's conception, birth, experience to death actually exists and keeps moving forward. This is because the sun and the moon are still changing day by day, and they cannot and cannot stop for a moment. Time keeps moving forward; this People are always moving in space. When this person dies and life ends for this person, it means that time has stopped for this person. If the mother who gave birth to this person is still alive, she will see that time has not actually stopped. Let’s leave this topic for now and talk about it later.
Second, make time reversible, that is, go back in time. This is to illustrate one point, reversing time is reversing time. Time reversal allows a person to go back to the past. This topic will be left for now and will be discussed later. Third, let the time close. Let me emphasize, what is closure, closure cannot be understood as stop. In other words, time itself has not stopped, nor has it flowed backwards, nor has it been closed. It is just an artificial participation in the intermittent activities of time through another means. In order to further explain these ways of time, I have to talk about gravity.
Among the issues of universal gravitation, we may have all noticed or thought about it, or even experienced it, and that is that no matter how far apart two objects are, they will generate universal gravitation. This gravitational force travels from one place to another without spending any time. So how is this force transmitted? If there is one, this transmitter must be faster than the speed of light. For now, all we know is that the speed of light is the fastest. Our customized time is based on the speed of light.
There is another interesting phenomenon, which is also controversial in the scientific community. That's why gravity is inversely proportional to the square of distance? As we all know, universal gravitation is proportional to mass, and there will be a gravitational force between objects, but not a repulsive force. However, in the vast universe, it is obvious that there is not only universal gravitation. According to the theory of relativity, there should also be a universal repulsive force. We know that light irradiation is inversely proportional to the square of the distance. That is because the irradiated spherical surface is proportional to the square of the radius, and the irradiance per unit area is naturally inversely proportional to the square of the radius.
There is a question that the scientific community cannot explain, that is, is universal gravity also a gravitational field that radiates outward? Also, why is the gravitational constant constant in the universe? What are the factors that determine the origin of this cosmological constant from the universe? This involves cosmic power. The world of diversity can be said to be a world full of energy. Once I have explained the cosmic force clearly, we can return to the issue of time. Now let me ask you a question. How many forces are there in the universe that you can usually see, feel, or even think about?
Li Zhuangzhuang immediately replied: Uncle, for me, this has been known for a long time in our middle school physics class. Forces include gravity, elasticity, pressure, buoyancy, resistance and electricity.
What you said is not entirely correct. There are also magnetism, friction, explosion, water, and fire. Zhao Shiyan hurriedly added.
Xin Ruofei immediately objected: What you said is not complete: there should be ability, field force, intelligence, gas power, mechanical force, external force, and internal force.
Liu Yiyi suddenly smiled and pointed at Xin Ruofei: What are these powers of yours? Is there tension, manpower, ox power, and horse power? This is where the pair are! No matter how many forces you name in the universe, they can be summarized into four: gravity, electromagnetic force, strong force and weak force. The earliest discovery of gravity was Newton's outstanding contribution. Electromagnetic forces include electricity and magnetism. We Chinese are the first to know that the compass is the earliest application of magnetism. In fact, the strong force is the nuclear force, which refers to the force inside the nucleus of an atom. Atomic bombs and hydrogen bombs also release nuclear power. The weak force belongs to the advanced research scope of physics, and it is relatively difficult to perceive it.
right! Yiyi answered very well! Na Linwan praised enthusiastically: If we want to understand the weak force, we must start with the strong force. We all know that matter is composed of molecules, molecules are composed of atoms, and atoms are composed of electrons and nuclei. The most beneficial and outstanding thing that science has developed to this day is the use of atomic energy. Atomic energy is the use of nuclear energy of atoms. The nucleus is made up of protons and neutrons.
The proton is composed of 2 up quarks and one down quark; the neutron is composed of 2 down quarks and 1 up quark. Quark is a basic particle and a basic component of matter. Quarks combine with each other to form a composite particle called a hadron; the most stable of them are protons and neutrons, which are components of the atomic nucleus. Let’s briefly talk about hadrons. Hadrons are composite particles composed of quarks or antiquarks bound together by a strong force. Hadrons are divided into two categories, baryons and mesons. Baryons are composed of 3 quarks or 3 antiquarks; mesons are composed of up quarks and antiquarks.
Atomic nuclei have powerful energy, and light is produced when energy is present. Light is formed from photons. Photons, also called light quanta, move at the speed of light and have energy, momentum, and mass. In other words, photons have speed, energy, momentum, mass, and condensation. Photons cannot stand still. This point must be emphasized. Photons also have the characteristic that they can turn into other substances, but they exhibit conservation of energy and momentum.
Returning to the weak force, let me explain it in detail. Because the weak force is different from macroscopic visible forces such as gravity and electromagnetism, it only exists within the range of extremely tiny particles, so it is difficult to perceive it. However, scientists have discovered that the weak force has a wonderful decay process, from neutrons to protons to electrons to neutrinos. In this process, no photons participate, so it is not caused by electromagnetic force. Similarly, it is not caused by gravity, because the mass of the particle is too small and its gravity is not enough to cause decay.
Finally, because the strong force between nuclei attracts each other, it is even less likely to cause decay. This is what the weak force does. However, there is a question that scientists have been tracking, where does the weak force come from? Not to mention, scientists actually found the fifth force, which is the supercharge force. So, the question comes again, under what force is the supercharge force generated?
Dad, I have understood. You are saying that there is a substance in the universe that we don’t know about. Since there is matter that we can see, let’s call it positive matter, then according to the principle of relativity, there must be invisible matter. Negative matter.
(End of chapter)
