Planet SVG is a celestial body rotating along the orbit of a star or its remnants, massive enough to become rounded under the influence of its own gravity, but not massive enough to start a thermonuclear reaction, and managed to clear the surroundings of its orbit of planetesimals.
The term “planet” – is ancient and has links to history, science, mythology and religion. In many early cultures of the planet were considered as carriers of divine origin or at least as divine emissaries. As science has evolved, the understanding of the planets has changed in no small measure, with the discovery of new sites and the discovery of differences between them.
In the understanding of scientists of Ptolemy’s epoch the Planet SVG revolved around the Earth in ideally round orbits. The idea to the contrary – that in fact the Earth, like other planets revolves around the Sun – was put forward more than once, but only in the XVII century it was justified by the results of observations of Tycho Brahe, received before the first telescopes made by Galileo Galilei. Through careful analysis of the data, Johann Kepler discovered that the orbits of the planets were not round, but elliptical. As the instruments of observation have improved, astronomers have found that, like the Earth, the planets rotate around an axis tilted to the plane of their orbit and have features that are characteristic of the Earth, such as a change of seasons. Since the dawn of the space age, close observations have made it possible to detect volcanic activity, tectonic processes, hurricanes and even the presence of water on other planets of the solar system.
The planets can be divided into two main classes: large, low-density giant planets and smaller, land-like planets with a solid surface. According to the International Astronomical Union, there are 8 planets in the solar system. In order of distance from the Sun there are four earthlike planets: Mercury, Venus, Earth, Mars, then four giant planets: Jupiter, Saturn, Uranus and Neptune. In Solar system also there are at least 5 dwarf planets: Pluto (before 2006 considered to be the ninth planet), Makemak, Haumea, Erida and Ceres. Except for Mercury and Venus, all the planets have at least one satellite around them.
Since 1992, with the discovery of hundreds of planets around other stars called exoplanets, it has become clear that planets can be found in the Galaxy everywhere and they have much in common with the planets of the solar system. In 2006, the International Astronomical Union (IAU) gave a new definition of the planet, which has generated both approval and criticism from the scientific community, and is still being pursued by some scientists.
As of January 20, 2016, 2049 exoplanets in 1297 planetary systems, of which 507 have more than one Planet SVG, have been reliably confirmed. The size of the exoplanet ranges from the size of the Earth’s group of planets to larger planets than the giant planets