Why are the planets of the solar system located almost in the same plane?

According to scientists, as Wikipedia writes, the solar system turned out to be flat due to the rotation of the gas cloud from which the planets were formed. Namely:

Due to the rotation, the compression rates of the clouds parallel and perpendicular to the axis of rotation were different, which led to the flattening of the cloud and the formation of a characteristic protoplanetary disk.

Everything seems to be logical. Parallel to the axis of rotation, no forces push the cloud apart, and it quietly contracts. Perpendicular to the axis of rotation, centrifugal forces stretch the cloud, and it shrinks less. And here is such a beautiful drawing. Yes, it was immediately stated in plain text that the compression rates, which appeared out of nowhere, have little to do with the formation of the disk.

Let's draw the same picture in a slightly different form. On it, the planets move in a plane perpendicular to the monitor screen (let it be away from us).

Of course, such a parade of planets, when they are lined up in one line, is quite a rare occurrence. Or it may be completely impossible. But the fact that they line up approximately in one line in groups is a more frequent phenomenon. Now imagine that a certain planet, for example, 3, is outside this line, say at point A, the gravitational forces of the other planets will immediately call it to order. At this moment, planet 3 will receive an additional speed v towards the line of planets. The magnitude of this speed depends on the masses of the planets, but the important thing is that it is. In the next similar cycle, the speed may increase and sooner or later the planet will return to its place.

The same process will take place with planets 4 and 5, if some asteroids have knocked them out of the plane of motion or they have not yet had time to integrate into this order of motion during the formation of the system. Their gravitational forces will be drawn into the protoplanetary disk. Of course, gravitational forces can be called compression forces and then the quote from Wikipedia will be fair.

For the same reason, bodies that are in approximately the same orbit are also collected. If two earths revolved in the same orbit around the sun, then, in the end, they would be attracted to each other. Wouldn't shrink, but just pulled in.

This also explains the precession of the perihelion of Mercury.

Because of this, the plane of rotation of the moon turned out to be in the plane of the planets. If the moon revolved around the earth, as shown in Figure 3, then we would never see a solar eclipse.

The moon rotating in the plane of the perpendicular line between the earth and the sun will never hit this line to block the sun from us. But this situation is not sustainable. As soon as the gravitational force of the sun Fgc slightly attracts the moon to itself, the plane of rotation of the moon will slightly unfold into the sun-earth plane. Now at point a the force of attraction of the sun will always be greater than at point b and the plane of rotation of the moon will rotate until it becomes parallel to the sun-earth line. Everything fell into place.

This is how systems are formed in which the forces of attraction, in particular gravity, act. These are all galaxies and star systems. Although the gravitational forces may be small, over millions or billions of years everyone orbiting something will line up in a plane.

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