solar system - one of many planetary systems in the vast Milky Way galaxy, but it is the only more or less understood.Besides her, the galaxy is more than one million star systems, about which we know nothing.Modern technologies of space exploration gives an opportunity to learn a lot of information about the structure and the structure of the solar system, the position of the planets and their parameters, as well as other celestial bodies that are in it.Now we know that it is located in the center of the Sun, around which the different rates under the influence of gravitational forces of the planets revolve, including Earth.A large fraction of the mass of the Sun accounts - almost 99.866%, and 99% from the rest of the mass is concentrated in the giant planets.
Previously it was assumed that in our solar system planets 9, but since deleted from the list of planets Pluto in 2006, it can be assumed that they became 8. Each of them carries out the rotation around the Sun in its orbit determined, and all orbits arein the same plane of the ecliptic.They are conventionally divided into two groups.In the first Earth-like planets are composed primarily of iron ore and stone rocks are Mercury, Earth, Venus and Mars.The planets of the group closest to the sun.Mercury and Venus have no moons, Mars has two of them - Demos and Phobos moves around the Earth as the Moon.
Planet of the second group are called giant planets thanks to the huge mass and volume in several times higher than the terrestrial objects.These are Uranus, Saturn, Jupiter and Neptune.They are gas, often made up of hydrogen and helium, and only Saturn has a solid core.The planets of this type is that their orbits are much farther from the sun than the representatives of the first group.And another difference between them is the presence of a large number of moons around these planets.For example, Jupiter is accompanied by 63 satellites of Saturn near 62 and a few rings of Uranus has 27 and Neptune - 13.
Mercury is closest to the sun.Its orbit is just 57, 9 million. Km from the sun.The orbit of Venus is a little further - to 108.2 million. Km.A third of the distance is Earth.Its path of rotation around the celestial body is located at a distance 149 600 000. Km, which is ideally suited for life on the planet.In fact, only one of our planet is the life of the entire system.Mars, as compared to other terrestrial objects, the most distant.Its orbit - the fourth - 227 900 000. Km.
Location giant planets are much farther from the sun.The closest is Jupiter - the largest of all the planets in our solar system.It rotates in the fifth orbit 778,600,000. Kilometers from the sun.Sixth orbit on 1433700000. Kilometers takes Saturn, which is in second place among the largest of the planets.Uranus moves through the seventh orbit, which is distant from the Sun 2,870,400,000. Km.And the most distant of the planets - Neptune.Its orbit is located at a distance of 4,491,100,000. Km.
Many models of the planets of the solar system conventionally displayed at equal intervals between the orbits of all the planets, but it looks a little different in reality.By and large, the distance between them increases proportionately with the remoteness from light.
rotation of almost all the planets going the opposite direction clockwise as seen from the North Pole, but Venus and Uranus are the exception.They move in the opposite direction.And yet at the same time Uranus has an axial tilt is almost 90 °, which looks as if it is lying on its side.
position of the planets in the solar system, and their weight is largely influenced by the speed of rotation around the sun.Mercury rotates faster than anyone - it makes a complete revolution around the world in 88 days (of the earth).And the slowest - Neptune - its turnover for the required 165 years.
