The solar system is called the system of planets, which includes its center - the sun, as well as other objects of space. They rotate around the sun. Even recently, the "planet" was called 9 space objects that rotate around the Sun. Now scientists have been established that the boundaries of the solar system have both planets that turn around the stars.
In 2006, the astronomer union proclaimed that the planet of the solar system is the cosmic objects of the spherical shape, rotating around the sun. On the scale of the solar system, the Earth seems extremely small. In addition to land around the Sun, eight planets rotate around the Sun in its individual orbits. All of them exceed the land in size. Rotate in the plane of the ecliptic.
Planets as part of the Solar System: Types
Location of the earth group towards the Sun
The first planet is Mercury, behind him is Venus; Next, our land follows and, finally, Mars.
The planets of the earth group do not have many satellites or moons. Of these four planets, only land and Mars have satellites.
Planets, which relate to the earth's group, are highly density, consist of metal or stone. Basically, they are small and rotate around their axis. The speed of their rotation is also small.
Gas giants
These are the four space objects that are at the greatest distance from the Sun: under No. 5 is Jupiter, followed by Saturn, then Uranus and Neptune.
Jupiter and Saturn are impressive in the size of the planet, consist of compounds of hydrogen and helium. The density of gas planets is low. Rotate at high speed, have satellites and surrounded by rings asteroids.
The "Ice Giants", which include uranium and neptune - less, in the composition of their atmospheres there are methane, carbon monoxide.
Gas giants have a strong gravitational field, so many space objects can be attracted, unlike the Earth Group.
According to the suggestions of scientists, asteroid rings are the remnants of the moon changed by the gravitational field of the planets.
Dwarf Planet.
Dwarfs are space objects whose size does not reach the planet, but exceeds the dimensions of the asteroid. In the solar system of such objects a great set. They are concentrated in the area of \u200b\u200bKuiper's belt. Satellites of gas giants are dwarf planets, who left their orbit.
Planets of the Solar System: the process of occurrence
According to the hypothesis of cosmic nebulae, the stars are born in the clouds of dust and gas, in the nebulae.
Thanks to the strength of the attraction of the substance, combine. Under the influence of the concentrated gravity force, the center of the nebula is compressed and stars are formed. Dust and gases are transformed into rings. Rings are rotating under the influence of gravity, and planetazimals are formed in the waterways, which increase and attract cosmetic objects.
Under the influence of the force of attraction, the planetazimali is compressed and purchased spherical outlines. Spheres can be united and gradually turn into protoplants.
Within the solar system there are eight planets. They appeal around the sun. Their location is:
The nearest "neighbor" of the Sun - Mercury, behind him is Venus, then the Earth follows, then Mars and Jupiter are coming further from the sun, Saturn, Uranus and the last, Neptune are located.
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