Why does the earth turn? 5. Why does the earth turn?

Almost all celestial bodies in the solar system, including asteroids, rotate according to the law of the right-hand rule, and the rotation of all or most celestial bodies is also the right-hand rule. Why? The predecessor of the solar system was a dense cloud, driven by a certain force that caused it to attract each other, and this accretion process made the density gradually larger, which accelerated the accretion process.

On the one hand, the centripetal accretion accumulation becomes the sun, and on the other hand, the gas gradually develops into a flattened shape, and in the process of development, the potential energy becomes kinetic energy, and finally the whole thing turns. At the beginning of the turn, there are those who turn this way and those who turn that, and after a certain direction prevails, they all become one direction, and this direction is now discovered as the right-hand rule. The energy of the earth's rotation** is caused by the eventual transformation of material potential energy into kinetic energy, which ultimately means that the earth rotates on the one hand and rotates on the other.

The earth has a fixed momentum moment at the time of its birth, and the gravitational pull of the sun is parallel to this momentum moment during the earth's movement, and the rotation of the inherent period occurs due to the conservation of the momentum moment.

But it has been proven that the Earth's rotation period is not only increasing, but very slow. This is mainly due to the gravitational pull of the moon, because three-quarters of the earth's oceans, under the action of the gravitational pull of the moon, there are periodic tides, this large-scale movement of water has a certain friction with the earth, and the friction is perpendicular to the earth's rotation momentum, so it will change its angular velocity, making it slower and slower. Because the earth rotates in one day, and the moon rotates in one month, as long as their cycles are different, there will always be tidal phenomena.

The Earth's rotation period will continue to increase until the Earth's rotation period reaches one month, when the Moon will be stationary relative to the Earth, and will reach a stable state thereafter. Therefore, the final day on Earth will be a month now.

3 All have always been curious, why does the balloon spin and not fall?

In the early days of the earth, it was just an asteroid, relying on gravity to continuously capture foreign celestial bodies to strengthen itself, and foreign celestial bodies were moving at high speed relative to the earth, so the process of capture was a violent collision. The largest impact occurred 4.5 billion years ago, when a large asteroid hit the Earth from the side, causing the Earth to spin, and the material and asteroids that collided out formed the moon, and the crater left by the impact formed the ocean. Without the Moon, the Earth would wobbly or even turn upside down.

The gravitational pull of the Moon is the best stabilizer of the Earth's axis of rotation, pointing it near the North Star and keeping it at 66 degrees 34 minutes from the plane of rotation. So that the earth has four seasons in the year. In the beginning, the earth rotated very fast, only 5 hours a day, and the deceleration effect of tidal friction became 24 hours a day.

This is the story of the formation of the Earth's moon. So, it is inertia that keeps it spinning, and tidal friction caused by gravitational force slows it down slowly.

I don't know, but I know how you were born.

I've always wondered why the balloon spins and doesn't fall?

The cause of the rotation of the planets needs to be solved by the principle of hydrostatic equilibrium. There is nothing that can be done under it.