What forces keep the planets suspended in space, will they fall? Where will it fall?

"What forces keep the planets suspended in space? Will they fall? Where will it fall? " In fact, there will be such a problem, or because Newton's law is not fully understood. So, let's talk briefly about what Newton said first.

Newton's three laws should be summarized as follows:

the first law: force is the reason to change the motion state of an object;

the second law: the effect of force is to make the object get acceleration;

the third law: force is the interaction between objects, and the action of force is mutual.

In fact, this is the "gravity" of the earth, so it has the function of "force".

But space is not like this. There is no place "below" in space that is attractive to the earth. Therefore, in space, there is actually a state of weightlessness.

So, because we live on the earth, we feel that if there is nothing to hold, things will fall, and we forget that things will fall to the ground because of the gravity of the earth.

what attracts the earth in space is actually the gravity of the sun, because the mass of the sun accounts for 99.86% of the whole solar system, and according to the formula of universal gravitation, universal gravitation is directly proportional to the mass. Therefore, if the earth wants to move, it is also leaning in the direction of the sun, rather than falling down. After all, there are no large celestial bodies attracting "below".

It is only because the earth has a certain initial velocity that the earth revolves around the sun. If the earth has no initial velocity, it will definitely fall into the sun. The sun is attracted by the matter in the center of the Milky Way and the dark matter in the Milky Way, so the sun moves around the Milky Way with the solar system.

the nature of gravity

just now, we solved the problem of "the earth will never fall back". However, maybe you have to ask, what is gravity? In fact, the torture of "gravity" is no less than those ultimate questions such as "the origin of life" and "the origin of the universe". We can objectively describe the phenomenon described by gravity. To put it bluntly, many celestial bodies are rotating around massive celestial bodies, and this rotation has another feature, not just a simple circle, but an elliptical orbit.

Not only an ellipse, but this elliptical orbit also moves. This is also called precession.

Not only do orbits move, but celestial bodies are also moving around the center of mass.

for this phenomenon, early scholars are at a loss. It was not until Newton appeared that most problems were solved. Newton's law of universal gravitation can actually solve the problem of elliptical orbit and the problem of motion around the center. However, the problem of "precession" has never been solved.

If you want to ask Newton, what is the essence of gravity? To tell the truth, he will tell you: let the later people solve it. Because he really doesn't know. Moreover, because there is no time parameter in Newton's law of universal gravitation, Newton thinks that gravity is a kind of action at a distance, specifically, the propagation of gravity is completed instantly. If the sun suddenly disappears, all the celestial bodies in the solar system will fly out along the tangent direction of the orbit as if they received short messages at the same time.

About the essence of gravity, more than 2 years after Newton, a scientist named Einstein began to study and put forward the general theory of relativity. He believes that the earth is "forced" to revolve around the sun. Why do you say that?

He believes that time and space are not discrete physical quantities, but constitute three-dimensional space-time, and the speed of light is a special attribute of three-dimensional space-time.

As for gravity, to put it bluntly, it is because the mass of the sun is extremely large, which distorts three-dimensional space-time.

For the convenience of description, we project three-dimensional space-time into two dimensions to describe it. The reason why the earth moves around the sun is that the sun does not actually exert the so-called "gravity". But the earth is moving along its own path, which is actually similar to the earth walking in a straight line in a two-dimensional plane, which is in line with Newton's first law, except that this path is distorted by the sun in three-dimensional space-time.

We call this movement moving along the geodesic line of three-dimensional space-time. However, from our visual point of view, it is circling, but for three-dimensional time and space, it is actually "walking in a straight line".

Therefore, in the general theory of relativity, Einstein believes that the essence of gravity is the bending of time and space. This theory explains the problem of "precession" well, and when describing gravity, the error from reality is even smaller than Newton's law, which is more accurate than Newton's law. Therefore, Einstein's general theory of relativity has become the mainstream theory to explain the nature of gravity.

So, this also solves the problem at the beginning. In fact, the earth is moving along its own path, and this path looks like the earth revolves around the sun. The earth will not fall anywhere, because it is already on the ground of three-dimensional time and space.

First of all, there is no such concept as "up, down, left, right and left" in our eyes. There is no concept of direction in space, or you think that up is up, but I can also think of it as down. Up and down are only people's subjective concepts, usually in this narrow space of the earth!

In fact, the planets in the universe love you not because I am suspended in space. They are really "falling". For example, the moon has been falling towards the earth, and the earth is falling towards the sun ...

So why can't it fall? Why didn't the earth fall but on the sun?

Because the sun is round, and the radian of the earth's falling coincides with the radian of the sun, the earth will not fall to the sun. Simply put, the speed makes the earth produce centrifugal force, which is in balance with the falling gravity!

Everything in the universe operates in this balance, and if some balance is broken, it will really fall to a planet, such as a meteorite comet flying in space. If it is caught by the gravity of a planet and its speed is not fast enough, it will fall to that planet!

So in short, everything in the universe keeps falling, but the movement will not make the planet really fall to a certain planet.

so where does the initial strength of this movement come from?

If we trace back to the source, it is the power of BIGBANG, and at the same time, there is the imbalance of temperature, density and gravity caused by the gradual cooling of the universe after the Big Bang. This imbalance caused a certain area to start moving regularly, and the conservation of angular momentum began to play a role, and various celestial bodies and galaxies were formed!

What forces keep the planets suspended in space? Will they fall? Where will it fall?

In fact, including the Milky Way, all of them are falling in a certain direction, but they will never fall to the bottom. Perhaps it is better to describe it as a bottomless pit! But in a smaller scope, such as the solar system, it needs to be understood by another model, but without exception, gravity is at work. For example, the only link between the earth and the sun is gravity, so why hasn't the sun's huge body dragged the earth into the sun? Of course, it is obvious that what competes with gravity is the balance of centrifugal force produced by the revolution of the earth!

If you are interested, you might as well calculate the first cosmic velocity of the sun in Earth orbit. The formula is simple:

V= GM/R

G is the gravitational constant, m is the mass of the sun, and r is the radius of the Earth orbit, and all the above parameters can be found;

the calculated orbit speed is 29,74.317 m, which is about 29.74KM

Obviously, this speed is between perihelion speed and apohelion speed, because the revolution speed of the earth is 3.3KM/S, which exceeds the orbit speed of the earth, so it runs out of a perihelion of 147.1 million km and apohelion of 152 million. And all the celestial bodies in the solar system are running in orbit, without leaving the solar system or falling the sun, in a state of balance! But the sun is gradually losing its mass, so the earth will gradually move away from the sun in the future, and the earth will be further away from the sun in the future white dwarf era!

however, the solar system orbits the galactic center at a speed of 24KM/S, which obviously will not let the solar system escape or fall into the galactic center black hole!

But on a larger cosmic scale, the Milky Way and the local galaxy group are moving towards the giant source of the gravitational center of the Rania Kaya supercluster! However, at this distance of 25 million light years, the expansion speed of the universe will make the giant source leave more than 44KM/S, while the speed of the Milky Way is only 6-8KM/S, so there is no need to worry that the Milky Way will fall into the giant source in the future!

The foam on the sea goes with the flow. Because the motion state of foam is determined by the collision of countless water molecules.

If we are just a small fish, we can't help but wonder why bubbles float in space.

before classical mechanics came into being, people also had such problems about the motion of celestial bodies in the sky. At that time, the prevailing geocentric theory said that the earth is the center of the universe, and all celestial bodies move around the earth in a circle. Therefore, people attribute the motion of celestial bodies around the earth to the natural properties of celestial bodies.

however, in the period of classical mechanics, Newton put forward the formula of universal gravitation based on the observation and induction of predecessors, and thought that the motions of various celestial bodies were determined by their mutual attraction. Thus, all celestial bodies, including the sun and the earth, are in motion, and they move relatively around each other's center of mass.

The classical mechanics established by Newton is an ideal physics that ignores the physical background. This theory only considers the intrinsic properties of matter, but ignores the external environment of objects. It's as if the small fish only saw the movement of foam and didn't feel the existence of seawater. Therefore, the small fish completely attributed the movement of foam to the properties of foam.

In addition, as the gravity at a distance, Newton did not give its specific physical mechanism, that is, he did not tell us how two objects with a certain distance produced gravity.

in the 2th century, the discovery of Planck's constant h and the dimension of this constant is the angular momentum of particles show that our universe is full of the smallest particles that can't be divided-quantum, which constitutes the physical background of the universe, that is, quantum space.

Later, Rutherford hit the atom with alpha particles and found that only a very small proportion of the particles were bounced back by the atom. This shows that most of the space in the atom is empty, and the volume of the atom is only a closed system formed by the high-speed movement of electrons, that is, the matter is not real. Matter is just a closed system composed of high-energy quanta.

Therefore, our universe is really like a quantum ocean, and matter is just a bubble made of quanta. Therefore, the motion of matter, in addition to its initial motion, will also be influenced by quantum space, drifting with the flow in quantum space.

if the quantum space is completely symmetrical, that is, its distribution is flat and uniform, then the matter should be floating in the quantum space statically.

however, if the quantum space is asymmetrically distributed due to the existence of matter, that is, various fields are formed, then for another object, it is necessary to balance the asymmetry of the quantum space by corresponding motion.

This is the motion of an object under stress. For this object, the state of its motion is to keep consistent with quantum space to the greatest extent, that is, to keep the space quantum colliding symmetrically with it.

in a word, the reason why celestial bodies float in the air and different celestial bodies move relatively is because space is full of inseparable quanta. Moreover, the natural motion state of celestial bodies is the state in which the collisions of space quanta are cancelled out.

what forces keep the planet suspended in space? Will they fall? If you want to fall, where is the bottom? I think of another question. Have the same effect, I stand well, head up, then people on the other side of the earth are not head down? It's terrible. Is it terrible? It's not terrible at all. Why? The following refers to the center of the earth. Oh, it's settled. People on the earth, everyone is head up. Does that mean that the center of the earth is artificially regulated? No, it's a natural attribute. Gravity determines it. What's the situation below? Is the ultimate ownership of all the things above. Everything or people on it will fall unless something blocks it. Why? It's gravity that makes these things fall. Will gravity make these planets fall?

is it possible? Where does it fall? Fall into their center of gravity. What do you mean? Then let's take our time and look at the nearby planets centered on our earth. Will it fall? Some meteors passing through our earth. Don't boys and girls like to wish on a meteor shower? This is the light that some small celestial bodies fall and burn in the atmosphere. If it is bigger, such as an asteroid, it will lead to catastrophe. For example, an asteroid falling in 65 million years led to the extinction of dinosaurs. Then why didn't the moon next to the earth fall? That's because the moon has a speed. It moves around the earth at a certain speed. Just offset the gravity that made him fall. And he didn't reach fast enough to escape from the earth. In this way, month after month, year after year around the earth, never leave! Satellites of other planets in the solar system also revolve around their respective planets in this way.

who has the greatest gravity in the solar system? Nature is the sun. The mass of the sun accounts for 99.86% of the mass of the whole solar system, and it has absolute authority. All planets, large and small, have their own satellites and turn around the sun together, as well as comets. If anyone is lazy, they will fall down and fall to the sun. The sun is absolutely welcome!

what about the sun? Will there be a place to drop it? Yes! Where? The center of the galaxy! The sun runs at hundreds of kilometers per second with the whole solar system. Around the Milky Way for more than 2 million years. So as not to fall to the center of the galaxy.

and the whole galaxy revolves around the local group of galaxies. Now we know that because of gravity, the planet may fall (gravity center), and because of the speed of revolution, the planet can revolve around the center of its system intact! Of course, during this period, I naturally fell behind. That's right