Why is the sun round? Why is the sun round?

Stars originally evolved from relatively large blocks in nebulae. If you think about gravity, you can create a scenario in your brain, which is kind of like a snowball. If you have snowballed, it is not difficult to understand why the stars are round.

We all know that the reason why the planet is round is because the force of the gravitational field originates from the center of the star, pulling all the matter inward. The massive body of the planet, combined with the heat generated by the radioactive elements inside, behaves like a liquid, succumbing to the gravitational pull from the center of gravity for a long time, thus forming a circle. The only way to get all the matter as close to the planet's gravity center as possible is to form a sphere; This process is called isostatic adjustment.

But not all planets are round.

For smaller stars, such as asteroids, the gravitational force is too small to surpass the force of its own structure. As a result, these stars retain their irregular and incomplete shapes, rather than forming spherical shapes.

All space stars are spheres, and whether they are standard or not is not certain.

And thermonuclear fusion reactions are constantly taking place on the surface of the sun, tending to gaseous and liquid states, which makes it easier to form standard spheres.

It's because of their constant rotation and their own gravity. Gravity causes larger substances to sink inward, and rotation causes lighter substances to be evenly distributed.

For larger objects, its gravitational pull is strong enough to overcome the rigid force of the surface and become an approximate sphere on its own; But smaller celestial bodies don't have enough gravitational pull to overcome rigid physical strength. The limit of the Earth's peaks is 15 kilometers, and beyond that number, the Earth's gravity pulls it back. The radius of 15 kilometers is very small relative to the Earth's 6,300 kilometers, and for a celestial body like the Sun, which is 330,000 times the mass of the Earth, its gravitational pull is much greater than that of the Earth, and it is an inevitable consequence that it will become a sphere.

Why is the earth round.

The Earth was created long ago when rocks in the solar system collided with each other to form planets. From the beginning of its formation until the present, the earth has been mainly composed of liquid rocks. In space, where gravity is minimal, liquid matter will automatically form a spherical shape.

This has been demonstrated by experiments conducted by astronauts in the space environment with substances such as water, fruit juice and liquid metal. The Earth is a huge liquid sphere at a considerable distance from the Sun, which gradually forms a circle as it moves through space. Asteroids and small stars such as the moons of Mars are so weak in their gravitational pull that they cannot form a circle once they form a solid star.

Due to the large size of the Earth, its gravitational pull is strong enough to make itself circular. If there is no tectonic plate movement that makes the peaks taller, gravity will make the Earth become more and more round.

When the universe was formed. Many heavy metals are concentrated. And the core of the earth was formed. In turn, it attracts non-heavy metal substances such as dust.

But what is an elliptical shape in the earth is related to the characteristics of the circle and its rotation.

When the core of the earth reaches a certain weight. The gravitational pull will cause the external force to carve. Because of the depression. Approaching the center of a metal with a heavier mass.

And the gravitational pull at the bulge. Because there is the thickness of the earth's crust. Whereas, the gravitational pull is weaker. (Lower depressions under gravity.) Can't attract magma).

And because the metal materials in the center of the earth almost always emit nuclear energy in the early stage. The enormous heat turns the earth into a liquid state. This force is even stronger.

This causes the magma to fill in from the bulge to the recess. It also makes the crust at about the same distance from the center of the earth everywhere. (The distance from any point on the surface of the circle to the center of the circle.)

same) and when the Earth has a centroid. It already rotates. The centrifugal force causes the Earth's equator to be slightly thicker than the meridian circle. That is, to make the earth incomplete and circular. Rather, it is an ellipse.

Is the sun round?

In 1961, American astrophysicists Browns and Dick proposed a new theory of gravity, arguing that the high-speed rotation of the sun's center would cause the sun to flatten, that is, the equatorial part of the sun was slightly convex. They calculated that the diameter of the Sun's equator was 60 kilometers larger than the diameter of the pole.

This shows that it is extremely difficult to measure the flattening of the Sun, which is nearly 1.4 million kilometers longitude. The flattening of the Sun is calculated according to this number to be about 1 in 10,000, and the result is less than 1 in 10,000, which shows that the Sun is not an oblate sphere with a slight bulge in the middle like the Earth. Rather, it is a sphere that is close to a perfect circle.

But this conclusion has yet to be further confirmed by scientists.

2. The mystery of the origin of the moon?

The Moon revolves around the Earth and is inseparable, and is a natural satellite of the Earth. But how did the moon come into being, and did it come from? There are several ways to say this. 1. They are both twin brothers and sisters.

Scientists have carefully analyzed these moon rocks and used advanced instruments to measure them, and found that the moon rocks are as old as the earth's rocks, all of which originated 4.6 billion years ago. Therefore, the Earth and the Moon may be a twin brother and sister.

In fact, the sun is not perfectly round, but an ellipsoid. The reason why the sun and other celestial bodies are nearly spherical and not some other strange shape is entirely the result of gravity.

According to Newton's law, the magnitude of gravitational attraction is inversely proportional to the square of the distance between two objects, regardless of the position of the objects in relation to each other. As a result, a finite number of identical particles that are not evenly distributed tend to clump together to form spherical clusters. Suppose that in the period of time after the universe is large, a large number of different particles are unevenly distributed in the universe, thus forming a large unevenly distributed cloud of matter, in this cloud of matter, the particles attract each other, but the overall gravitational force does not reach equilibrium, there is still some kind of disturbance to make it rotate.

At this time, the scattered clouds of matter gradually converge under the action of gravity, and at the same time begin to rotate due to their own heterogeneity and the action of some external forces, so that a roughly (not perfectly spherical) placed celestial body is formed. Its shape will depend on the magnitude of its rotation speed, and the faster the rotation, the closer its shape will be to an ellipsoidal shape.

In fact, don't talk about it so complicated, the liquid or gas in the vacuum is spherical without being disturbed by external forces, which is caused by gravitational force and surface tension.

The Sun is not a solid sphere like the Earth, but it looks like a sphere

The earth is not round, it is elliptical. The gravitational force is right, under the action of gravity, the object around the gravitational force must be circular in order to achieve a uniform force. For example, there must be a difference in the force of a rectangle.

However, due to rotation, the surface of the planet is not round, and the sun is not actually round.

Universal gravitation. If not affected by external forces, all objects have a tendency to concentrate towards the center under the action of gravitational force. The most concentrated knots.

It's spherical! Although the surface of the earth is solid, because solids are also deformable, and solid fragments can move, these.

all make it possible to transform it into a spherical shape.

Because the sun is also autobiographical, you can see that the planets in the autobiography are all nearly round, because of centrifugal force.

If the sun were in a different shape, it would be a big problem.

Ellipsoidal, the stars in the universe are all elliptical.

The reason for the rotation.

The sun is a high-speed rotating object, in the process of rotation, the center of the sun's gravitational field is equal to the edge of the position, if the sun is not round, if it is square, then in the same gravitational field, the surface cover of the sun to the core of the sun (central force field point) is not equal, then it will affect the rotation of the sun, which will cause a very unstable phenomenon, because there is a gravitational field, then a centrifugal force will be generated in the process of rotation, under the action of a centrifugal force, If it is square, then the force at the edge point of it is not the same, there is a force difference between the objects, in mechanics it is relative motion, the final result of the movement under the action of the force difference is a state of equilibrium, the force between the edge points of the rotating object tends to be in a state of equilibrium, only in the ball can be reflected, if the sun is square then its surface is very unstable, I think we will not evolve so developed.

Because the earth rotates.

And it has the presence of a magnetic field.

With the rotation. The material on the surface of the earth is constantly moving closer to the center of the earth under the attraction of the magnetic field.

The presence of rotation and magnetic fields makes them evenly distributed on the surface.

That's why the earth is round.