Why do the stars in the universe keep spinning?

Simply put, it's gravity.

The reason for the revolution. Because there is a gravitational pull between the stars, for example, if you pay attention, you will find that in the solar system, the closer the planet is to the sun, the faster it will revolve (in kilometers and seconds, it is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, if it stops orbiting, then a small planet will be attracted by the gravitational pull of another large planet.

Rotation reason. We know that 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 attracted 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 rotation, there are those who turn this way, and those who turn that way, after a certain direction prevails, they all become one direction, and this direction is the right-hand rule that is now discovered, and there may be other solar systems that are left-handed rules, but in our solar system it is 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.

Conversion to the reason** I really don't know about this issue).

There are two types of rotation: revolution and rotation.

Revolution is the gravitational force between the stars as a centripetal force. Otherwise, it is conceivable that there is acceleration between the stars, that is, the stars move in opposite directions, and the final result is that the stars collide, that is, in the universe, the unequal stars will sooner or later collide with other stars and be destroyed. The result of this natural selection is that most of the stars in the universe are orbital.

Of course, there will certainly be injustices now, but sooner or later they will be destroyed.

Rotation is due to the fact that stars and planets are formed by molecular clouds, which have a certain directional potential force when they are formed, so they must rotate. Even if the star does not rotate at first, as long as another object of considerable mass approaches, its gravitational pull will drive the planet to rotate in a certain direction without stopping (because of the law of inertia).

All stars rotate, which is determined by the formation of stars, but the cycles are different, and even the Milky Way is constantly rotating.

There are several hypotheses for the formation of the solar system, one of which is that the solar system is formed by the condensation of gas in a constant rotation, and this hypothesis seems to take the rotation of the entire solar system for granted.

However, the rotation of the sun and the rotation of the earth have a lot in common. The earth is a solid sphere, and the time it takes for it to rotate in one rotation is the same everywhere on the ground, it is a day. When the sun rotates, the time it takes to complete a revolution in various places on it is different, some places take a long time, and some places take a short time.

The shortest is 24 days, and the longest is around 34 days.

The action of gravitational force causes a force between the stars in the universe, and under the action of the force, the stars in the universe will of course rotate without stopping.

Because there is a gravitational force in the center, the centrifugal force generated when you turn just balances out the gravitational force. If you don't turn, you fall into the central celestial body. (So being able to spin is a random phenomenon.) ）

If galaxies rotate in one direction, does that mean that the entire universe is rotating? Why? It turns out that the direction of rotation of positive and negative space must be regular, there are clockwise and counterclockwise reasons, scientists are studying and exploring, but the known planets generally orbit like large galaxies, as for rotation, unless there are other reasons, besides, rotation belongs to the private affairs of planets, and the gravitational induction of large galaxies is generally not there.

Taking the Milky Way as an example, the rotation of the solar system is in the direction of one arrival, from west to east, is counterclockwise, the eight planets (except Venus and Uranus), the rotation direction of the rotation is one arrival, from west to east, but unlike the moon of the earth, the moon is for the service of the earth.

The Earth rotates from west to east so that the sun rises from the east, but the rotation and revolution of the Moon are synchronized, and the back side of the rotation is always not exposed to the Earth, and the rotation of the Moon is mainly tidal locked, while illuminating the Earth at night. Even for the rotation of Venus and Uranus, it is also counterclockwise, the direction of rotation is different, from east to west, there are many kinds of clockwise rotation of them, but they are not sure, I think, before the solar system combined, their rotation direction is different, the shape of centrifugal force has long been different, not so that the solar system, is determined by the big **.

It does not affect the gravitational pull of the sun, because the rotation of Venus and Uranus is still counterclockwise, as for the rotation interference of the gravitational pull of the sun, just like human beings, the gravitational pull of the sun has no effect on human beings, it is all their own private affairs, and their purpose of rotating clockwise from east to west is probably to hope that the sun will rise from the west. Angular momentum refers to the velocity at which the vector diameter of a particle sweeps through the region. In other words, if the vector diameter of a particle is smaller, its rotational velocity increases.

This is the conservation of angular momentum.

The Milky Way is thought to have been formed when a primordial supermassive black hole pulled into a huge cloud of interstellar matter. This mass of interstellar matter has had angular momentum since its formation. Then, due to some unknown interference, the star-making movement began, and one star after another gradually formed.

Interstellar matter shrinks as stars form, but angular momentum does not disappear in the process. So the Milky Way began to spin.