Why does the earth spare the sun and not the other way around?

First of all, it is stated that, if only from the kinematic point of view, who revolves around whom is only a question of frame of reference, and does not involve a question of principle.

It's just that the ancestors of modern science developed a set of theoretical mechanics methods that make us more accustomed to the idea that the earth revolves around the sun.

This is because, from the point of view of classical mechanics, the two rotate around each other, and the center of rotation is the center of mass of both. And since the mass of the Sun is much larger than that of the Earth, the centroid of mass of both is extremely close to the center of mass of the Sun itself. Therefore, the center of mass coordinate system is almost indistinguishable from the solar coordinate system, and it looks as if the Earth is revolving around the sun.

I wonder if this explanation is understood?

You can also say that the sun revolves around the earth, if you use the earth as a frame of reference. But if we take the Sun as a reference system, we will find that most of the stars in the solar system (except for the moons) revolve around the Sun. This makes it easier for us to study our solar system.

It depends on which frame of reference is relatively to, if the sun is chosen as the frame of reference, the earth revolves around the sun, if the earth is chosen as the frame of reference, on the contrary, if their center of mass is chosen as the frame of reference, then the earth and the sun revolve around the center of mass.

Are you trying to ask why the reversal instead of clockwise? We are in the universe, can you say that is up and down? What is timeliness? Is it against time? If you draw a counterclockwise circle with arrows on the paper, and look at the back of the paper, isn't it timely?

The same can be said

This is the case with all galaxies in the universe, where the light ones surround the large ones

The main principle is the law of inertia

The mass is not the most important, but the gravitational force is the most important.

It is right that the earth revolves around the sun and represents the revolution of the earth.

As the Earth rotates, it also revolves around the Sun. The movement of the earth around the sun is called the revolution of the earth. Because the Earth orbits the Sun along with other celestial bodies in the solar system, the Sun is the central body they share.

The direction of the revolution is also from west to east, and the time for one revolution is one year. Therefore, the rotation of the sun will also bring us the change of the four seasons, spring, summer, autumn and winter.

The earth's revolution is driven by the sun's rotation, just as an axis drives a wheel to turn, and the sun's gravity (gravitational pull) keeps the earth from flying away from the sun.

Just as the rotation of the earth has its own unique regularity, the rotation of the earth also has its own laws. These laws are manifested in several aspects, such as the earth's orbit, the earth's orbital plane, the yellow-red angle, the period of the earth's revolution, the speed of the earth's revolution, and the effect of the earth's revolution.

In practical terms, it is not right for the sun to revolve around the earth for the following reasons:

The sun is a star, and a star is a planet that does not change its position and mostly glows and heats, because the star does not move, so this idea is not true.

If there is a difference between right and wrong, it should be the difference in reference:

The Earth's revolving orbit around the Sun is based on the Sun as a reference, assuming that the Sun does not move; The sun revolves around the earth with the earth as a reference, and the earth is assumed to be immobile, which is due to the different references when the object is in mechanical motion, resulting in different descriptions.

In fact, strictly speaking, the Earth does not revolve around the Sun, but around the center of mass of the system that the Earth and the Sun make up (if the influence of other celestial bodies is not taken into account). This is because the effect of gravity is concentrated in this point, which means that the earth seems to be attracted to this one point. After studying high school physics, I know that in this case, as long as the initial velocity is not towards this center of mass (the earth is obviously not moving towards this center, the lucky one) will make a uniform circular or elliptical motion, in fact, the real circular motion does not exist, because there is resistance, its speed will continue to decrease, of course, this decrease is very small on the earth, otherwise we would have been baked.

Since the mass of the Sun is much greater than that of the Earth, the center of mass mentioned above can almost be considered to be in the center of the Sun. So there's nothing wrong with the Earth revolving around the sun.

In fact, it is not the sun that revolves around the earth, but the earth revolves around the sun, and the sun is the center of the entire solar system, and the stars around the sun revolve around it due to the gravitational force. The reason why we see the sun revolving around the earth is because the earth revolves around the sun and at the same time it rotates itself, and the sun appears to us to be constantly revolving around the earth.

This is the gravitational force that Newton discovered.

This attraction exists between any two objects. This attraction between objects is prevalent between all things in the universe and is called gravitational force.

Gravitation is an interaction between objects due to the mass they have. Its size is related to the mass of the object and the distance between the two objects. The greater the mass of the object, the greater the gravitational pull between them; The farther apart the objects, the less gravitational pull there is between them.

The reality is that the Earth and the Sun move together around their common centroid point. Since this common centroid point is located on the sun, humans only observe the movement of the earth around the "sun, that is, the center of mass at the sun", and cannot see the movement of the sun around the mass point at the sun (since this mass point is not in the center of the sun, the sun also has a small precessional motion) - a small precession.

Of course, modern scientists have observed and calculated this movement of the sun.

As for why it rotates, it is generally believed that in order to maintain a stable orbit (without hitting the Sun), a centrifugal force opposite to the centripetal force (gravitational force) is required, so that the planet or (natural) satellite will move in a circular motion (including an ellipse).

It is the gravitational pull of the sun that attracts the earth to a certain extent, but the moon is a special example, because according to the gravitational pull of the earth, it is completely unable to attract the moon, and the moon is not a planet of this universe at all, because the age of this universe is about 14 billion years, but the two rocks found from the moon are 20 billion years old. So the moon could be a spaceship of aliens in the other 5 universes.

Give me extra points, all hands.

The force that makes the earth revolve around the sun is gravitational force, and the force that rotates the earth is the centripetal force (centripetal force is an effect force), as long as the object has mass m on the surface of the earth, it will have gravity g (g = m * meters every square second), and the resultant force of gravity and centripetal force acts on the same object with gravitational force is the equilibrium effect of the co-point force.

As for "Why doesn't the sun suck the earth directly and collide together?" "My personal opinion on this question is:

The action of the force is mutual, the sun is on the earth and the earth is also pulling the sun, because these two forces are balanced, so they are relatively stationary, as far as the macroscopic point of view is actually the sun is still revolving around the center of the galaxy with the nine planets of the solar system.

The mass of the sun is large, and from the perspective of classical mechanics, the gravitational force is mutual, but the centripetal acceleration of the earth is much greater than that of the sun, so the earth revolves around the sun, and if the mass of the earth is about the same as that of the sun, and the distance is far enough, then it will revolve around the center.

First, the mass of the earth is smaller than that of the sun, but if the mass of the earth is too small, it will crash into the sun, and secondly, the earth will be at a certain distance from the sun, and if the distance is too close, it will still crash into the sun, and the third earth will rotate fast, and if it is slow, it will still crash into the sun.

These three factors make the earth revolve around the sun.