Planets of the solar system
Solar system — the planetary system that includes a Central star — the Sun — and all the natural space objects orbiting the Sun. It was formed by gravitational contraction of the dust cloud around is 4.57 billion years ago. Note: the sun is not a planet.
Planets of the solar system in order:
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Pluto is the decision of the MAC (international Astronomical Union) no longer applies to the planets of the Solar system, and is a dwarf planet and even inferior in diameter another dwarf planet Eris. Designation 134340 Pluto.
Scientists have put forward many versions of the origin of our Solar system. In the forties of the last century Otto Schmidt put forward the hypothesis that the Solar system arose because the cold dust cloud attracted by the Sun. Over time the cloud formed the foundations for future planets. In modern science it is theory that Schmidt is the principal.
The solar system represents only a small part of a large galaxy called the milky Way. In the milky Way consists of over one hundred billion different stars. To realize such a simple truth it took several hundred millennia.The discovery of the solar system did not happen immediately, step by step, on the basis of the victories and mistakes, was formed system of knowledge. The main base for exploration of the Solar system had knowledge about the Earth.
Fundamentals and theory
The main milestones in the study of the Solar system are the modern atomic system, the heliocentric system of Copernicus and Ptolemy. The most likely version of the origin system believes the Big Bang theory. According to her, the formation of galaxies started with the “recession” elements of megasystems. At the turn of the impenetrable house was born our Solar system.
The basis of everything is the Sun is 99.8% of the total volume, the share of the planets accounts for 0.13%, the remaining 0,0003% are various bodies of our system.
Scientists decided to divide the planets into two conditional groups. The first is a planet like the Earth: the Earth itself. Venus. Mercury. The main distinguishing characteristics of the planets of the first group is relatively small in size, hardness, a small number of satellites. The second group includes the Uranium. Neptune and Saturn – they are characterized by large sizes (planet of giants), they form the gases helium and hydrogen.
In addition to the Sun and planets to our system include planetary satellites, comets, meteorites and asteroids.
Special attention should be paid to the asteroid belt, located between Jupiter and Mars. and between the orbits of Pluto and Neptune. At this point in science there is no single version of any such entities.
What the planet is now not considered a planet:
Pluto since its discovery and until 2006 was considered a planet, but later in the outer part of the Solar System was discovered many celestial bodies, comparable in size with Pluto and even exceeding it. To avoid confusion, was given a new definition of a planet. Pluto does not come under this definition, so he was given a new “status” dwarf planet. So, Pluto can serve as the answer to the question: it was previously considered a planet, but not now. However, some scientists still believe that Pluto should be reclassified back to the planet.
The scientists ‘ predictions
On the basis of research, the scientists say that the sun is approaching the middle of his life. It’s inconceivable to imagine what would happen if the Sun goes out. But scientists say that it is not only possible, but inevitable.
The age of the Sun determined with the help of the latest computer developments and found that he has about five billion years. According to astronomical law the life of a star like our Sun, lasts for about ten billion years. Thus, our solar system is located in the middle of the life cycle.
What scientists mean by “goes out”? Huge solar energy is the energy of hydrogen at the core becomes helium. Every second about six hundred tons of hydrogen in the core of the Sun is processed into helium. Scientists estimate that the Sun has spent most of its reserves of hydrogen.