Why are most planets round and there are never square ones?

Why are most planets in the universe round?

As we all know, among the eight planets in the solar system, all are spherical. Why is this? To understand this question, we have to start with gravity.

Newton discovered universal gravitation and told the world that all objects have mutual attraction. Gravity is inseparable from the mass of objects and the distance between objects. The greater the mass, the greater the gravitational force; the closer the distance, the greater the gravitational force.

Even between two people, there is gravity. When people are in space with very little gravity, the gravity between people will pull everyone's body together. The gravity between two adults is greater than the gravity between two children at the same distance. The universal gravitation controls the movement of all celestial bodies in the universe from beginning to end.

For example, the moon revolves around the earth because of the gravitational force between the moon and the earth. The states of objects are mostly composed of several different forms such as solid, liquid, gas and plasma. With different temperatures, the vibration of molecules inside the substance will also be different. The lower the temperature, the smaller the vibration amplitude, the greater the binding force of the object, and the overall state will appear solid.

The earth is a solid planet, and its huge mass creates a centripetal gravitational force. Moreover, the greater the mass, the greater the gravitational force. However, does the greater the mass, the rounder the planet?

In the universe, mass determines everything. When a celestial body is heavy enough, generally speaking, if its diameter exceeds 500 kilometers, it is spherical, while if its diameter is less than 50 kilometers, it will appear irregular.

When the diameter of these solid or liquid celestial bodies reaches the limit of 500 kilometers, the gravity will be greater due to the huge size of the celestial body, and this gravity is evenly distributed, so the planet will be round. It is as if there is an invisible hand, kneading the planet with the force of gravity to make it round.

However, due to the impact of foreign asteroids, the rotation and revolution of the planet, the surface of the planet is not necessarily completely smooth, there will be potholes and ups and downs, just like the moon. Although it is a sphere, it is not smooth. Compared with the entire planet, these are insignificant.

Is it true that the greater the gravity, the rounder the planet?

In fact, this is not the case. Take Jupiter for example, it is not completely round. This is because Jupiter rotates very fast, which creates centrifugal force. Near the equator, the centrifugal force is the greatest, causing the entire planet to tilt slightly.

And our Earth is not completely round, it is also a little flat. The same thing happens to all planets, and we have to be very careful to observe it.

But are all the planets in the solar system round? In addition to the eight major planets, there are many small planets with very small masses. Their masses are irregular, just like a big rock.

There is only one star in the solar system, the Sun. When a massive companion star appears near a star, the tidal force can twist the star into an oblate spheroid, such as Beta Lyrae.

Then why are most celestial bodies round?

First, during the formation of celestial bodies, they gather tiny particles in a spiral manner, with the small ones moving around the large ones and then being swallowed by the large ones. This movement mode causes celestial bodies to be round.

Secondly, after the formation of celestial bodies, their movement patterns caused them to develop into spheres. The movement of celestial bodies in space mainly depends on the combination of revolution and rotation. This movement causes the part of the celestial body that is not round to be thrown out.

There is a theory called the Moon Formation Theory. The moon is a part of the bulge on the earth's surface, and was later thrown out to form. The gravity inside the celestial body ensures the stability of the circle. Any celestial body has a center of mass, and this center of mass has attraction to any part of the celestial body. Because the earth has a lot of matter and a large volume, its gravity is enough to make it round.

If there were no rich internal interactions that caused the mountains to protrude and grow taller, gravity would make the earth more and more round. If all the planets in the universe were square or other shapes, what would our world look like? Welcome to leave a message in the comment section.

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