# What is the transmission of gravitation, does this transmission need a medium?

Some people ask: Do you need a medium for the spread of force, then what does the universal gravitation in the universe rely on? Why?

**First of all, we have to think of media and media as two different concepts. Communication requires media but not media.**

So the question itself is contradictory. The first half of "Does the force propagation need a medium?" It can be answered that it is not needed. For example, solar electromagnetic radiation is the propagation of electromagnetic force, which is the speed of light in a vacuum, which is 299792458m/s m/Seconds, this speed will be slower in any medium. If it is slow in the air, it is generally ignored, but in water, it is only 225 million m/s, in alcohol it is 220 million m/s, in glassMedium is 200 million m/s.

These are media. For example, current needs to be transmitted in metal wires. This is the medium. But the propagation of force does not require these media. Without medium, the smoother and fuller the propagation. But the propagation of force requires the medium. The medium is forceIt is an integral part of itself, not a medium other than physical strength. So the second half asks, "what is the transmission of universal gravity?", there are some donkey lips that are different from the previous question.

Modern physics believes that there are four basic forces in this world, namely strong force, weak force, electromagnetic force, and gravitational force. These four forces all require media. The strong media is gluon, the weak mediaIs the intermediate boson, the propagation medium of electromagnetic force is photon, and the propagation medium of gravity is graviton.

**Universal gravity is the weakest of the four forces.**

Gravity is weak, it is the weakest of the four basic forces, only one-tenth of 10^38, which is one-tenth of one trillion trillion; one trillion of electromagnetic forceOne billionth of a billion; one billionth of a billion, which is weak. Therefore, although the gravitational force is very long, the gravitational force is too weak, and even small objects cannot be measured, and it decays exponentially with the distance to a certain distance.There is no real influence.

The magnitude of gravity follows the law of universal gravitation, expressed as: F=GMm/r^2

In the formula, F represents the magnitude of gravity, G is the constant of gravity, M and m are the masses of the objects on both sides of gravity, and r is the distance of the center of mass between the objects.

This law shows that the magnitude of gravity is proportional to the mass and inversely proportional to the square of the distance. The constant of gravity G is the gravity value of two 1 kg objects whose centroids are one meter apart, G=6.67259×10^-11N·m^2/kg^2, which is about 0.0000000000667N·m^2/kg^2, how weak is this? Unless precision instruments, can you feel it? It can be seen that Cavendish's torsion scale experiment in order to measure this GHow many thoughts.

But gravity is a long-range force, theoretically infinitely far, for example, a person’s gravity can also be transmitted to infinity in a vacuum. But because gravity is weak, it decays quickly with distance, out of a certain range, justCan be ignored.

**The essence of gravitation is the perturbation of time and space by matter.**

Einstein in the general theory of relativity revealed that the essence of gravity is the disturbance of mass in space and time. Any object with mass will disturb space and time, just like a stone thrown into the water, no matter how small, it will fluctuate.And ripples, even if a dust falls in theory, it will disturb the water, but it can only be measured. Therefore, the magnitude of the impact on the space-time disturbance is proportional to the mass of the object and inversely proportional to the square of the distance. This is related to gravityThe laws are consistent, and this disturbance appears in the appearance of gravity.

Because the spatiotemporal disturbance is the formation of a spatiotemporal vortex or a trap around the object, the objects will be affected by this trap, and they will fall into each other's trap, just like pulling each other. This is the source of gravitation. The larger the mass objectThe larger the space-time vortex or trap formed, the smaller mass object will fall into this trap when passing near the larger mass object, just like this large object attracts small objects to itself.

**Although the ripples of space-time disturbances will propagate far and far in the form of gravitational waves, each object acts as a gravitational source with a limited distance.**

For example, the radius of the sun's gravitational influence is about 1 light-year, and the radius of the earth's gravitational influence is about 1.5 million kilometers. At a distance, this effect is very weak. And the universe is full of all kinds of celestial bodies, except this celestial body'S gravitational range is probably close to the gravitational range of another celestial body.

To sum up, there is a medium for gravitational transmission. This medium is a graviton, but the gravitational is only a conjecture of quantum mechanics, which has not been proved so far; while gravitational transmission does not require a medium, any massThe so-called "medium" is actually a source of gravity.

That's it, welcome to discuss, thanks for reading.

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