There are countless stars in motion in the universe, why do they rarely collide?

Stars are so massive that they can clear large swathes of the starry sky, leaving only enough material to form planets, dwarf planets, comets, and other interstellar matter. According to the couple's view, for a long time after the birth of the universe, the probability of stars being absorbed and detonated after collision is very large, but with the passage of time, the probability of star collision in the universe is getting smaller and smaller. For two stars to collide, they need to be close in mass, close to each other, and have suitable orbits, which is still difficult to achieve in the vast universe.

As if a star was close to a black hole, it was swallowed up.

The universe is very large, it is very empty, galaxies are far apart, and in the galaxy it is also very empty, each star is far apart, and it has its orbit, so there are very few star collisions.

Because the celestial bodies in the universe all rotate periodically, those that should have collided together would have collided long ago.

This is because each planet has its orbit and the orbit of each planet is fixed, except for a few times when asteroid orbits occur, resulting in collisions.

In terms of the number of stars, there is definitely still the possibility of star collisions, but it is too difficult to find. There is a time lag in human observation of stars in the universe, and it is difficult to find specific celestial activity, and it is not possible to see anything if you want to observe. As this is certain, many other celestial motions will be discovered, and there is a possibility of star collisions.

Each star has its own trajectory, depending on the situation. If they are in gravitational equilibrium, they will not collide because none of the stars have a magnetic field.

Because each star has its own trajectory, they will not collide in the case of gravitational equilibrium.

There are very vast relative distances between stars, galaxies, star clusters, etc. The relative distance is very large, they move relative to each other, and the gravitational pull between them reaches some equilibrium.

The galaxies in the universe are in a stable state, and all celestial bodies have specific orbits, they are far apart from each other, and they all orbit around the center of the Milky Way, so the possibility of collisions between them is very small.

Because the universe is so big, you don't see it, there are countless stars colliding almost every moment, and the Milky Way is just a speck of dust in the universe.

At the same speed and in the same direction, stars in the same orbit will naturally not collide, just like there are many artificial satellites in geosynchronous orbit, they will never collide together.

The motion of celestial bodies is bound by gravity, and if there is no gravitational interference from other large celestial bodies, other planets will not go out of orbit and collide.

There are collisions, after hundreds of millions of years of evolution, from the beginning of chaos to the current orderly operation, after hundreds of millions of evolution, it has basically reached orderly operation and balance.

Because they all have their own trajectory, they don't cross their own trajectory.

There are so many people on the planet. Why don't you bump into each other while walking?

In fact, not only stars, but also naturally formed things in nature basically do not have square things, especially naturally formed by natural development, this problem I think has a lot to do with equilibrium mechanics, so to say that if there is no external force exerted on a thing, its development and development in all directions should be balanced, so that in the two-dimensional that is, the plane will form a circle, and in the three-dimensional space will form a sphere. This is explained from the formation, in the process of evolution square means edges and corners, under the action of various external forces, edges and corners will disappear, and there are similar results.

Why are stars in the universe round and not square? Why? In the future, I suggest that people must learn to understand what is the relationship between galaxies and planets in the universe, and what is going on, otherwise the questioner cannot always be asked, and the answerer cannot always be answered or the question is not answered?

I want to explain this question in too much detail and too long...!

Ancient and modern scientists at home and abroad have long characterized that all stars in the universe are called planets, and the ball is round (most of the ones I know are elliptical), not square, let's think about it, the circle is easy to roll, and the square has edges and corners that are not good for rolling! We need scientific arguments: planets have rotation and revolution, take the earth as an example, the north-south polar magnetic field, from west to east, gravity, why do we throw things into the air and fall to the ground, this common sense has been learned in junior high school, the earth's gravity makes the moon revolve around the earth, because the sun's gravity makes the nine planets revolve around the sun, the solar system is outside the Milky Way, the Milky Way galaxy is outside the galaxy, and so on is the galaxy planets hundreds of trillions of light years away are also attracted to each other. Spinning and existing, this natural law never ends!

There is born in nothing, the planet originates from energy, and the energy must be evenly diffused, so it must be spherical, the cosmic sphere, the planet, and the atomic sphere are all homologous in the same way, of course, why are the rocky planets uneven? It is formed by the movement of the earth's crust.

This is because it clears other objects in the orbit and allows for better rotation.

It has a lot to do with gravity, because every planet has some gravitational pull, and it will slowly become spherical.

This is because these planets are formed by their own gravitational pull, so they end up being spherical shapes.

Asteroid impact on the earth is almost a daily occurrence, since ancient times, and it can be said that our earth itself is formed by asteroid impact, even now, there are several asteroids breaking into the earth's atmosphere every day, but the vast majority of asteroids are relatively small in size and mass, and when they enter the earth's atmosphere, they quickly rub off with the earth's atmosphere, and when it is hot, it usually emits strong light, which is the meteor phenomenon we usually see at night.

However, there are also some relatively large asteroids, such as asteroids with a diameter of more than one meter and less than ten meters, most of which do not rub away in the atmosphere, so they will fall to the ground to form meteorites after flashing a bright light in the sky. If the asteroid were any larger, it would cause catastrophic events near the place where it landed.

The asteroid that attacked the Chelyabinsk region of Russia, which once injured more than 1,200 people, and shattered all the glass in a radius of several kilometers near the landing site, Valery Shuvalov, a researcher at the Institute of Geosphere Dynamics of the Russian Academy of Sciences, said that the "guest (asteroid)" who visited the Chelyabinsk region can be a small meteorite one meter square and weighing several tons or even more than ten tons, it may be a very rare iron-nickel meteorite, this meteorite is very hard, because the celestial body needs enough hardness to reach the lower atmosphere, Otherwise, it will burn up and disintegrate in the atmosphere, and the meteorite will fall at a speed of about 30 kilometers per second, causing a strong shock wave, which will cause many injuries and destruction of the glass of the building, but fortunately the meteorite will eventually fall into Lake Chebalkuli, and if it hits the building, it will completely destroy the building.

A meteorite one meter square has such great power, a diameter of tens of meters, hundreds of meters is likely to bring disaster, usually the larger the volume of the meteorite, the more catastrophic it is, the diameter of more than 500 meters meteorite will bring global impact, a diameter of five kilometers meteorite will cause a global extinction event.

The asteroid that hit the earth 65 million years ago and caused the extinction of the dinosaurs, scientists speculate that it has a diameter of about eight kilometers, and is considered to be one of the major asteroid impact events in the history of life on the earth, and 80% of the earth's biological species disappeared in that impact.

So if such an arrogant asteroid hits the earth now, will we humans have a way to deal with it? Today, with the development of human science and technology, it can be said that we have initially possessed the ability to deal with asteroid impacts, and now all major aerospace countries have cosmic object monitoring systems, and there are some international astronomical organizations with this ability, and the orbits of many large asteroids have been preliminarily calculated, and the asteroids with the possibility of impact have been monitored, so we judge and respond to asteroid impacts in January or even months in advance, and then launch nuclear bombs on the surface of the asteroid to nuclear bombs** The reaction force forces the asteroid to change its orbit, so that the asteroid can avoid colliding with the earth, which is the initial ability of human science and technology to overcome natural disasters.

In terms of radius or volume, there should be no upper limit to the size of a star. Because there is no clear dividing line between the outer atmosphere in which red giants emit light and interstellar space, it is generally believed that when the temperature of the outer atmosphere drops to the point where it no longer emits visible light, it is no longer counted as a sidereal radius, and it is out of the edge of the star. As the red giant expands, the temperature of its outer atmosphere is decreasing.

For now, someone has given the laurel of the largest star to the star Canis Major. The star is a red supergiant located 4,900 light-years from Earth, with an apparent magnitude of about 30 40 times the mass of the Sun and a radius of about 1,420 times the radius of the Sun. However, there are still doubts.

It is important to know that it is still difficult to accurately determine the size, mass and other parameters of distant celestial bodies, and many parameters are not very certain.

After Mori announced the size, mass and other parameters of the star Canis Major by astronomers, some people suggested that the size of the star was overestimated, and it was actually not that big. I don't know if it is.

There are several more stars that compete with VY Canis Major for the "crown of the largest stellar in volume". For example:

Shield Uy, radius 1708 192 solar radius.

Cygnus NML, 1650 Sun Half-voltaic paths.

WOH G64, 1540 solar radius, the largest star in the Big Magellanic Galaxy, but uncertain.

Westeros 1-26, 1530-1580 solar radius, but its size is still not determined.

VX Sagittarius, 1520 solar radius, but it is a pulsating variable star that changes in size all the time.

The constellation Cygnus, with a solar radius of 1420 and 2850, may be overestimated or underestimated, and it is not clear how much it is.

Looking at the starry sky, we will see the vast galaxy. There are thousands of miles of stars, and different stars make up the vast universe. Of course, everything follows certain laws, and so do the stars in the universe.

Moreover, according to observations, we have found that almost all the stars in the universe exist in the form of spheres. Whether there are other shapes of stars in the universe, we don't know. However, we can explore why all stars in the universe exist in the form of spheres.

Stars in the universe are usually in the form of spheres because they are affected by gravity. According to Newton's law of gravitation, we can understand that the magnitude of gravitational force is inversely proportional to the square of the distance between two objects and has nothing to do with the position between the objects. Therefore, all objects in the universe have a tendency to converge towards the center under the action of gravitational attraction.

Suppose that hundreds of millions of years ago, there were indeed stars such as squares or triangles, and over time, they would constantly change, and the sides and faces of these so-called square stars would gather downward until they formed a sphere.

Of course, stars in the universe are not only affected by gravitational forces, they are also affected by the repulsive forces that arise between molecules. The competition between gravitational and repulsive forces also pushes the stars into a state of relative equilibrium, and spheres are the best form of maintaining this equilibrium.

Throughout the ages, people have had endless imaginations about the universe. Pangu opened the sky and Chang'e ran to the moon is the beautiful imagination of ancient people for the universe; The launch of various exploration space rockets carries people's good wishes. It can be seen that the exploration of the universe is of great significance to the development of mankind.

In the process of exploring the universe, space technology has continued to progress and develop. The development of this technology can not only reveal the formation and evolution of the universe, but also promote the development of various technologies. For example, remote sensing technology and computer technology have all emerged with the development of aerospace technology.

It should have something to do with equilibrium, and it is also naturally conceived by nature, probably because I think that the spherical body is much better than the square body, and the spherical body is relatively stable in the universe.

This has something to do with the operation of the universe, with gravity, and with its own formation.

Because square planets are not conducive to motion, the planets in the universe are in motion.

Because most of them still have a certain trajectory, and there is a gravitational force between them, they can keep a certain distance from each other.