A law of interaction between objects, discovered by Newton in 1687. There is a mutual attraction between any objects, and the magnitude of this force is directly proportional to the mass of each object and inversely proportional to the square of the distance between them.
The law of universal gravitation was first proposed by Newton in his book "Mathematical Principles of Natural Philosophy" published in 1687. Newton used the law of universal gravitation to not only explain the laws of planetary motion, but also pointed out that the satellites of Jupiter and Saturn also had the same motion laws around the planets. He believed that in addition to the gravitational pull of the earth, the moon also suffered from the gravitational pull of the sun, thus explaining the two-mean deviation and business trip that had been discovered in the movement of the moon. In addition, he explained the orbits of comets and the tides on Earth. Successfully predicted and discovered Neptune based on the law of universal gravitation. After the emergence of the law of universal gravitation, the study of the motion of celestial bodies was officially based on mechanical theory, thus creating celestial mechanics. Simply put, the greater the mass, the greater the gravitational force generated by the object. The gravitational force generated by the mass of the earth is enough to grasp everything on the earth.
Any two particles attract each other through the force in the direction of the line connecting their centers. The magnitude of this gravitational force is directly proportional to the product of their masses and inversely proportional to the square of their distance. It has nothing to do with the chemical nature or physical state of the two objects and the intervening material.
Gravity is considered one of the fundamental forces in the universe in classical physics. It is directly proportional to mass and inversely proportional to the square of distance. But in Einstein's theory, gravity is no longer a fundamental force, but only a manifestation of the bending of the space-time structure. The reason that causes the space-time structure to bend is the huge mass.
According to the theory of general relativity, the space-time around the sun is affected by the huge mass of the sun, forming a curve of space-time, while the planets move according to their geodesics, which is equivalent to uniform linear motion in the inertial system.
Every particle in the universe attracts every other particle with a force. This force is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.
Specific to cosmic objects under extreme conditions such as black holes. It has a very strong attraction. When scientists explain this attraction, they attribute it to the curvature of space. The reason for the curvature of space is the huge mass of the black hole itself.
Quantum mechanics holds that gravity is caused by the exchange of gravitons between two particles.
In the early days, people were able to distinguish many forces, such as friction, gravity, air resistance, electricity and human power. Newton accurately attributed these seemingly different forces to the concept of universal gravitation for the first time: an apple falls to the ground, a person has weight, and the moon revolves around the earth. All these phenomena are caused by the same cause.
The reason why light is sucked into a black hole is because space is distorted by strong gravity. Light enters the black hole as it travels through the distorted space. Everyone knows that light only travels in straight lines. Light is not sucked in by gravity, but by gravity. Light still travels in a straight line, but space is distorted and enters the black hole. For example, if you draw a line on a piece of paper and twist the piece of paper, it will still be a line.
Light travels in straight lines, and according to the general theory of relativity, space bends under the action of the gravitational field. At this time, although light still travels along the shortest distance between any two points, it is no longer a straight line, but a curve. Figuratively speaking, it seems that light was originally going to travel in a straight line, but the strong gravity bent it.
Spirit escapers believe that gravity is the interaction between matter and matter. The gravitational field is the result of this effect. And the result is like a spatial property. It is precisely because of this spatial property that matter has inertia. And the size of this inertia is only related to the mass of the substance. The size of the mass will determine the size of the gravity. This is why gravitational mass and inertial mass are strictly proportional to each other, and this is correct. Einstein was right to establish the equivalence principle in this way.
Inertia itself is not a force, it is a property of matter manifested in a gravitational field. Don’t make a fuss about gravity and inertial force to make things difficult for you. “Gravity is the source of inertia.”
At different scales and under different particle motion conditions, they show completely different effects. This is also very reasonable philosophically.
In physics, gravitational waves are ripples in the curvature of space-time that propagate outward from a radiation source in the form of waves that transfer energy in the form of gravitational radiation. General relativity predicts the existence of gravitational waves. The existence of gravitational waves is a consequence of the Lorentz invariance of general relativity, as it introduces the concept of finite propagation speeds that introduce interactions. In contrast, gravitational waves cannot exist in Newton's classical gravity theory, because Newton's classical theory assumes that the interaction of matter propagates at infinite speed.
Gravity is thought to be an effect of the curvature of space-time. This bending is caused by the presence of mass. Generally speaking, the greater the mass contained in a given volume, the greater the curvature of spacetime caused at the boundaries of this volume. As a massive object moves through spacetime, changes in curvature reflect changes in the position of these objects. Under certain circumstances, accelerating objects can change this curvature and propagate outward at the speed of light in the form of waves. This propagation phenomenon is called gravitational waves.
When a gravitational wave passes through an observer, the observer will find that space-time is distorted due to the strain effect. When gravitational waves pass through, the distance between objects will increase and decrease rhythmically, and this frequency determines the frequency of the gravitational waves. The strength of this effect is inversely proportional to the distance between the sources producing the gravitational waves. Orbiting binary neutron star systems are predicted to be very powerful sources of gravitational waves when they merge, due to the huge accelerations they generate as they orbit close to each other. Since these sources are usually very far away, the effect when observed from Earth is very small.
Gravitational waves should be able to penetrate places that electromagnetic waves cannot. Therefore, it is speculated that gravitational waves can provide observers on earth with information about black holes and other strange objects in the distant universe. These celestial objects cannot be observed by traditional methods, such as optical telescopes and radio telescopes, so gravitational wave astronomy will give us new understanding of the operation of the universe.
Gravity and gravitational waves drive the conversion and operation of energy in the apocalypse. In addition to natural energy, the source of energy is the huge energy source in the underground world.
(End of chapter)