Is the earth a perpetual motion machine? Otherwise, where does its rotating power come from and will it keep turning?

Of course, the earth is not a perpetual motion machine. There is no perpetual motion machine in this world. Perpetual machine is an illusion, which violates the law of conservation of energy. Simply put, the power of the earth's rotation comes from four aspects, that is, gravity is fundamental, it is born in the womb, it is created by the acquired environment, and it is the result of inertial movement.

Let's start with the roots of gravity.

Newton discovered the law of gravity more than 300 years ago, revealing that everything in the world is restricted by gravity, so all celestial bodies in the universe are dominated by gravity. Stars, planets and other celestial bodies are also born under the action of gravity.

The ancestors of all celestial bodies are cosmic dust, that is, interstellar clouds or nebulae. Nebulae include the oldest virgin primary nebula, and regenerative nebulae scattered into space after 1 supernova explosion or multiple explosions.

The protonebula is the first nebula after BIGBANG, which is relatively pure and consists of only the lightest elements of hydrogen and helium and a small amount of lithium. Because of stellar nuclear fusion and supernova explosion, the composition of regenerative nebula is more complicated. Although it is still dominated by hydrogen and helium, it already contains 1 16% of the known elements from light to heavy.

Self-gravity causes nebulae to gather and contract to form stars.

The interstellar dust in space is very thin, but it is widely distributed, usually within a few light years. These interstellar clouds will slowly gather under the action of gravity, and this gathering will accelerate when encountering cosmic events such as supernova explosions.

Any star is born because the nebula shrinks continuously under the action of gravity, and eventually one or more stars are formed in the core, and the remaining dregs gather into planets. The solar system is also formed in this way, except that the solar system is a single star system with 1 star in the center.

In every star system, stars occupy most of the mass of the whole system. For example, the sun accounts for 99.86% of the mass of the entire solar system, and the remaining 0./kloc-0.4% of debris and residual gas form eight planets and hundreds of satellites, as well as several dwarf planets and countless asteroids.

The rotation of the earth comes from the mother's womb, and the formation of the star system.

To put it bluntly, the mothers of stars and planets are nebulae, but their rotation and revolution inherit the angular momentum of the formation process, so they are born.

The formation of any star system is a process in which a nebula shrinks continuously under the action of gravity. In the process of continuous contraction and rapid collapse of the nebula, due to the uneven and unbalanced contraction force, the nebula will rotate faster and faster, thus forming a rotating shaft far away from the poles and the equator. The huge centrifugal force will throw a planetary disk at the equatorial part of the nebula. This planetary disk is also called the stellar accretion disk, which is the later ecliptic plane.

As the core material of the nebula collapses closer and closer, the core part stimulates nuclear fusion at high temperature and high pressure, and stars are formed. The strong radiation pressure at the core of the star offsets the systolic pressure of the huge mass of the star itself, and the star no longer contracts, but constantly emits energy radiation into space. This is the main sequence star period of the star. The main sequence period of a star accounts for 90% of the total life of the star, which is the stable period of the star. The life span of the main sequence star of the sun is about10 billion years, and now it is about 5 billion years old.

The conservation of angular momentum in the mother's uterus forms the rotation and revolution of stars and planets.

After the formation of the sun, it inherited the angular momentum of the nebula, so it has been spinning. The planetary disk is still spinning, and some remaining nebula materials and debris collide constantly, still snowballing under the action of gravity. Finally, all the debris and residues near their orbits are rolled together and the orbit is cleared, and the planet is formed, and so is the earth.

The revolution and rotation of the eight planets in the solar system all inherit the conservation of angular momentum of planetary disks, and the direction of revolution is the same as that of the sun, and the direction of rotation is the same as that of revolution. From the bird's eye view of the North Pole of the sun, the revolution direction of all planets is counterclockwise, and the rotation direction is basically counterclockwise around their own rotation axis. so this is it？ What the mother's womb brings is the origin of nature.

The unity brought by the uterus changes in the acquired environment.

Humans come out of the womb with the genes of the previous generation. Apart from their innate attributes, they are also influenced by the acquired environment. When they grow up, they are not exactly like their parents. The same is true of planets. Although the natural revolution direction and the rotation direction are the same, in the acquired environment, this situation will change due to factors such as celestial collision.

At present, the rotation axes of all planets are not very positive, and the rotation and revolution of several planets change greatly. For example, Uranus' axis of rotation is tilted by 97.8? , almost lying on the rails; On the other hand, Venus rotates in the opposite direction to all planets, with a rotation period of 243 days and period of revolution's of 224.7 days, which takes longer than revolution.

It is believed that this is due to the collision of different celestial bodies in the early days of planet formation. Uranus and Venus were hit harder, which changed the natural rotation and revolution mode in the uterus. Our earth was also hit by a planet the size of Mars. As a result of the collision, its own mass increased by about 1/8 ~ 9, and a moon was born by mixing the two sides, with its rotation axis tilted by 23.44? Since then, there have been four seasons: spring, summer, autumn and winter.

Inertia will keep the attitude and momentum of the earth and keep moving forever.

Because there is no resistance in space, a celestial body will keep moving after it is formed, which is due to inertia. What is inertia? The standard interpretation is the property that an object remains in a static state or a state of uniform linear motion, which is called inertia.

How to understand this meaning? That is, any object, such as people, stones, planes, planets, etc., has the property of keeping at rest or moving in a straight line at a constant speed. What is their original state of motion, and the property of keeping this state is the same, that is, the inertia of the object. The size of inertia is only related to mass, and it is directly proportional to mass.

Inertia must be changed by external forces, and only external forces can change the state of inertia, otherwise they will always be like that. The earth has inherited angular momentum from its mother's womb, so it has been moving at a constant speed and will continue to move without resistance and external force.

But external forces have changed the attitude of the earth and are still changing.

This external force is the sun. Because of the huge gravitational source of the sun, the state of uniform linear motion of the earth has changed. The gravity of the sun tries to pull the earth into its arms, so the earth has to break free and run forward, and this running speed is just offset by the pull of the gravity of the sun, so that the earth can't run away, and the sun can't pull it, and it runs into a circle, which is the orbit of the earth's revolution.

Why are the orbital speeds of all planets offset by the sun's gravity? This is still in the womb, inheriting the speed of the planetary disk. When the solar system was just formed, the earth was closer to the sun, so the rotation speed and revolution speed would be faster. Only in this way can the gravity of the sun be offset.

At present, the earth is gradually moving away from the sun, and there are complex mechanisms. One of them is that the blowing of the solar wind and the gradual decrease of the sun's gravity cause the earth to gradually move away from the sun.

Therefore, the future revolution speed and rotation speed of the earth will be slower and slower, but this slow change is very slow. According to scientific research, the earth's rotation is about 1, and it is slow for a hundred years 1.6 milliseconds. 1 sec is equal to 1000 milliseconds, and it takes 62,500 years to slow down 1 sec, so after 1 100 million years, the earth's rotation will be slow down 16000 seconds, which is about 4.44 hours. This doesn't seem to change much, but some studies think that the rotation and revolution of the earth will change greatly after 1 100 million years, so I won't discuss it here.

This is the origin of the driving force of the earth's rotation and its change. Thank you for reading and welcome to discuss.

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