Around the Sun 8 planets rotate, among them there is Earth. All planets move on the orbits which are located practically in one plane, call it the ecliptic plane.
Instruction
1. In the Solar system there are 8 planets, all of them rotate around a star — the Sun. Since 2006 the Pluto was excluded by the solution of the International Astronomical Union from structure of planets of the Solar system, it is considered the dwarf planet at number 134340.
2. Pluto is located at distance of 5868.9 million km from the Sun, before it considered the most remote planet. However it has an elliptic orbit which lies in absolutely other plane, than other planets of the Solar system. The deviation of the plane of an orbit of Pluto demonstrates that most likely it was not formed of a gas-and-dust cloud as other planets, and later it was attracted by gravitation of the Sun.
3. Planets of the Solar system divide into two big groups. Enter into the first group Mercury, Venus, Mars and Earth, call them planets of terrestrial group. Orbits of these planets are disposed to the Sun closer than others. Saturn, the Neptune, Uranium and Jupiter are giant planets, after the to the weight and volume they many times over surpass planets of terrestrial group.
4. Mercury is most closer to the Sun, on distance of only 57.9 million km from it. Venus settles down in the following orbit, it is removed from the Sun on 108.2 million km. In the third orbit, at distance of 149.6 million km, there is our Earth, the only planet in the Solar system on which there is intelligent life. It is promoted by availability of water, the atmosphere at which there is an oxygen, and temperature, suitable for life.
5. The fourth orbit is occupied by Mars (227.9 million km from the Sun), and after it there are four planets of yupiteriansky group, giant planets: Jupiter, Saturn, Uranium and Neptune. There is a regularity which is called the rule Baud: everyone the subsequent of planets of the Solar system will be spaced from the Sun on average 1.7 times further. Only Jupiter breaks this ratio a little.
6. Almost all planets rotate around the Sun counterclockwise if to consider their movement from the North Pole, only Venus and Uranium move in the opposite direction. The Solar system rotates counterclockwise on our Galaxy the Milky Way too.
7. The average density of planets of the Solar system is not identical. At planets of terrestrial group it is high as they consist generally of stone breeds, iron ores and silicates. Giant planets have very low density, in their structure hydrogen and helium prevails. Planets of terrestrial group have atmospheres while on giant planets they are practically absent. Around planets of yupiteriansky group the congestion of helium, methane, ammonia and hydrogen is observed.