The dust and gas in the dust disk gradually gather through gravity to form the initial planetesimals. In the process of gathering, every dust and gas molecule is interacting, thus forming the motion law of the universe's rotation.
1, the rotation at the beginning of the formation of the solar system:
The solar system was formed by a nebula, and the materials in the nebula gradually gathered to form the early sun. The gravity of the sun gradually formed the whole solar system, but the sun was not fully formed at that time, because the temperature was not enough to produce nuclear fusion, and the surrounding substances were scattered dust and gas.
These dust and gas were captured by the gravity of the early sun. Some of these substances pass through the solar system and some come from inside the nebula. Matter passing through the solar system often has its own speed. When it is captured, it is close to the sun, and through the conservation of angular momentum, it forms the power of revolution. These substances collide with other substances to produce gravitational interaction, which finally drives the whole dust disk to start moving.
2, the rotation of the planet:
In the early days, the dust disk of the whole solar system began to move. In the process of movement, the collision and polymerization of matter are promoted, and the planetesimals, the precursors of planets, begin to appear in the solar system.
There were many planetesimals at first, but the orbits of planetesimals overlapped a lot, which made planetesimals collide and merge frequently. In the process of collision, some planetesimals gain the power of rotation, but in the universe, there is basically no resistance to rotation, so the motion of the planet continues.
After the formation of the solar system, the sun began to undergo nuclear fusion, producing light and heat. Excess materials outside the solar system began to return to the solar system through gravity and hit the planets, giving the solar system a second wave of power, and some planets even turned over due to violent impact. , such as Venus.
In the solar system, because the revolution direction of the planet is determined by the rotation direction of the dust disk, the revolution direction of the planet is the same.
The direction of rotation is mainly determined by the impact direction and angle. For example, Venus rotates in the opposite direction to the Earth. Venus was probably overturned by the impact of 180? Or Venus was hit from different angles, but the universe from static to dynamic is caused by the interaction of forces, which means that the revolution and rotation directions of different galaxies in the universe may be different, and everything depends on the coincidence at the beginning of galaxy formation!