How are planets formed? Is there a pattern to the order of the planets?

It is formed by the fusion of solar nuclei, and their arrangement is regular. The universe is very mysterious, it is like a mysterious masked man, waiting for us to uncover its mystery through scientific and technological research and exploration. In the countryside or on the outskirts of the city, when the air quality is better, we can often see the stars at night.

In fact, the stars we see with the naked eye are the planets in the universe. There are many of them and they come in different sizes, so sometimes we see stars that are either big or small. <>

The earth we live on is actually a planet. We are very small, so we think that the Earth, like the planets, is very big. But looking at the universe as a whole, such a planet is nothing more than a very small speck of dust in the universe.

In our solar system, there is only one star, and that is the Sun. The sun, which has a very large amount of energy, can use its own gravitational pull to gather a lot of matter in the universe. When these materials accumulate to a certain extent, they will be subjected to full-body nuclear fusion in the inner body of the sun.

When nuclear fusion occurs, the solar system has a very large cloud of particles. This cloud of particles is constantly rotating, which is what we call the solar nebula. After the formation of the solar nebula, the rest of the dust and gas produced by nuclear fusion eventually formed the planet as we know it.

In order to understand the past and present lives of planets, that is, to understand how planets were formed, scientists have collected a large amount of data for research and analysis according to the laws of the solar system. Eventually, it was discovered that the remaining gas and dust were also rotating rapidly, like the solar nebula, and they were called protoplanetary disks. In this protoplanetary disk, the matter inside also rotated and collided, and finally gathered into stars, which in turn collided with each other and attracted gravity to form a planet.

The universe has many secrets that we don't know yet, and our current technology is limited and cannot fully explain some of the phenomena that exist in the universe.

Planets are formed from gas dust, and different stars are formed due to different compositions of gas and dust, different volumes and masses. The planets are listed as Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in descending order from distant to near.

Around the stars, more absorbing cosmic dust gathers, and the dust collides with each other and sticks together. For a long time, the appearance of planetary embryos is called stars, and the law of action between stars is: if the size of two stars is very different, and the speed of each other is not large, after the collision, the small stars will be attracted by the big stars and merge.

In this way, there are fewer and fewer stars. The big planets were the relatively large stars at that time.

Stars collide with each other to form solid inner-layer planets of the solar system. Similarly, the gas condenses into huge spheres to form the outer layer of gas giants.

Planets may have been formed hundreds of millions of years ago, some very small matter in space gradually accumulated, and then the order and arrangement of planets must follow the laws of celestial motion, such as gravitation.

In order of distance from the Sun, they are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus ( ) Neptune.

Definition of planets: first, celestial bodies that must orbit stars; Second, the mass is large enough to rely on its own gravity to make the celestial body spherical; The third is that there should be no other objects in the vicinity of this orbit (clean up other objects in its orbit). According to this division, there are only eight planets in the solar system: water, metal, earth, fire, wood, and earth, plus the king of heaven and the king of the sea.

Related information. In contrast to the previous debate on the concept of nine planets in 2006, Pluto was classified as a dwarf planet and removed from the list of nine planets in the solar system in Resolution 5 adopted at the 26th session of the International Astronomical Union in Prague on 24 August 2006.

The large planet must be a celestial body orbiting a star, massive enough to be spherical by the mascot's gravity, and Pluto agrees. But Pluto has not been able to clear other objects in its orbit, so Pluto is classified as a dwarf planet. Since then, the solar system has changed from nine planets to eight planets.

Size arrangement

The nine planets are, in descending order of size (visual size): Jupiter - Saturn - Uranus - Neptune - Earth - Venus - Mars - Mercury - Pluto.

The nine planets are, in descending order of mass: Jupiter - Saturn - Neptune - Uranus - Earth - Venus - Mars - Mercury - Pluto.

The "Nine Planets" is the collective name of the nine planets that preceded the August 24 International Astronomical Union Congress in 2006, at which Pluto was downgraded to a dwarf planet, leaving only eight planets in the solar system. The "Nine Planets" statement has become history, replaced by the "Eight Planets".

Basic introduction

New astronomical discoveries have constantly called into question the traditional notion of the "Nine Planets", and American astronomers have misestimated the mass of Pluto and included Pluto in the "Nine Planets". Later, it was discovered that Pluto did not meet the definition of a planet, so it was kicked out of the "Nine Planets", leaving the Sun with eight planets left.

Astronomers have discovered some differences between Pluto and other planets in the solar system. Pluto is in orbit beyond Neptune and belongs to the Kuiper Belt on the outer part of the solar system, an area that has always been where the asteroids and comets of the solar system are concentrated today.

Since the 90s of the 20th century, astronomers have discovered that Kuiper has more objects orbiting the Sun and are larger than Pluto. For example, the American astronomer Brown discovered "2003UB313" (阋xì神星: 2326 12 kilometers in diameter, slightly smaller than Pluto.

but with a mass of 127% of Pluto), a celestial body with a mass greater than that of Pluto. Therefore, it is not difficult to understand the change from the "nine planets" to the "eight planets", otherwise the solar system will be "overflowing with planets".

According to the distance from the Sun, in descending order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.