Until recently, astronomers believed that such a concept as a planet concerns exclusively the solar system. All that is outside of it is uncharted cosmic bodies, most often stars of very large scales. But, as it turned out later, the planets, like peas, are scattered throughout the universe. They are different in their geological and chemical composition, they may or may not have an atmosphere, and all this depends on the interaction with the nearest star. The location of the planets in our solar system is unique. It is this factor that is fundamental for the conditions that were formed on each individual space object.
Our space house and its features
In the center of the solar system is the star of the same name, which enters into the category of yellow dwarfs. Its magnetic field is enough to hold around its axis nine planets of various sizes. Among them there are dwarf stony space bodies, gas immense giants that almost reach the parameters of the star itself, and objects of the "middle" class, to which the Earth belongs. The location of the planets of the solar system does not occur in ascending or descending order. We can say that with respect to the parameters of each individual astronomical body, their arrangement is chaotic, that is, a large one alternates with a small one.
Structure of the SS
To consider the location of the planets in our system, it is necessary to take the Sun as a reference point. This star is in the center of the SS, and it is its magnetic fields that correct the orbits and motions of all surrounding cosmic bodies. Nine planets revolve around the Sun, as well as the ring of asteroids that lies between Mars and Jupiter, and the Kuiper belt, located outside of Pluto. In these intervals, separate dwarf planets are also singled out, which are sometimes ascribed to the basic units of the system. Other astronomers believe that all these objects are nothing more than large asteroids, on which life can not under any circumstances arise. To this category, they attribute and Pluto himself, leaving in our system only 8 planetary units.
The order of the planets
So, we list all the planets, starting with the nearest to the Sun. In the first place, Mercury, Venus, then - Earth and Mars. After the Red Planet, a ring of asteroids passes, followed by a parade of giants consisting of gases. These are Jupiter, Saturn, Uranus and Neptune. The list is completed by the dwarf and icy Pluto, with its equally cold and black companion Charon. As we said above, a few more dwarf space units are isolated in the system. The arrangement of the dwarf planets of this category coincides with the Kuiper and asteroids belts. Ceres is in the asteroid ring. Makemake, Haumea and Eris - in the Kuiper belt.
Planets of the terrestrial group
This category includes cosmic bodies, which in their composition and parameters have much in common with our native planet. Their bowels are also filled with metals and stone, either a full-fledged atmosphere or a haze that resembles it is formed around the surface. The location of the terrestrial planets is easy to remember, because these are the first four objects that are directly next to the Sun - Mercury, Venus, Earth and Mars. Characteristic features are small dimensions, as well as a long period of rotation around its axis. Also of all the terrestrial planets, only Earth itself and Mars have satellites.
Giants consisting of gases and hot metals
The location of the planets of the solar system, which are called gas giants, is the furthest from the main luminary. They are behind the asteroid ring and stretch almost to the Kuiper belt. In total there are four giants - Jupiter, Saturn, Uranus and Neptune. Each of these planets consists of hydrogen and helium, and in the core region are molten metals up to the liquid state. All four giants are characterized by an incredibly strong gravitational field. Due to this, they attract numerous satellites, which form around them almost whole asteroid systems. The gas balls of the SS very quickly rotate, so they often have whirlwinds, hurricanes. But, despite all these similarities, it is worth remembering that each of the giants is unique in its composition, size and gravity.
Since we have already considered in detail the location of the planets from the Sun, we know that Pluto is furthest away, and its orbit is the most giant in the SS. He is the most important representative of dwarfs, and only he from this group is the most studied. Dwarfs refer to those cosmic bodies that are too small for planets, but also great for asteroids. Their structure can be comparable to Mars or Earth, or maybe just rocky, like any asteroid. Above we have listed the brightest representatives of this group - Ceres, Eris, Makemake, Haumea. In fact, dwarfs are found not only in two SS asteroid belts. Often called satellites of gas giants, which attracted to them due to the huge gravitational force.