International Astronomical Union

Imagine, for example, a model reduced that the Sun would be represented by a ball of football (about 22 cm in diameter). At this scale, the Earth would be 23.6 m away and would be a sphere with just 2 mm in diameter (the moon would be about 5 cm from the ground and would have a diameter of about 0.5 mm). Jupiter and Saturn would ball with about 2 cm in diameter, to 123 and 226 m from the Sun respectively. Pluto would be 931 m away from the Sun, with close to 0.3 mm in diameter. As soon as the nearest star (Proxima Centauri) would be 6,332 km from the Sun, and star Syrian 13.150 km.

main objects of the central system Solar star El Sol is the star of the planetary system found in the Earth; Therefore, it is the closest to the Earth and the star with greater apparent brightness. Its presence or its absence in the sky determine, respectively, the day and the evening. The energy radiated by the Sun is harnessed by photosynthetic beings, which constitute the basis of the food, thus being the main source of life energy chain. It also provides the energy that keeps running climate processes. The Sun is a star located in the phase called main sequence, with a type spectral G2, which was formed about 5000 million years ago and will remain on the main sequence approximately another 5000 million years. The Sun, along with the Earth and all the celestial bodies that orbit to its form around the Solar System. Planets on 24 August 2006, in Prague, in the XXVI General Assembly the International Astronomical Union (IAU), excluded Pluto as a planet in the Solar System. After a long dispute about this resolution, the decision was taken unanimously.

This recognizes the error of having awarded the category of Planet Pluto in 1930, year of its discovery. From that day the Solar system is made up of 8 planets. 8 Planets of the Solar system, according to its proximity to the Sun, are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Planets are stars that describe paths called orbits to rotate around the Sun, have enough mass for its gravity to overcome rigid body forces so that they assume a spherical hydrostatic equilibrium (practically) and have cleared the neighbourhood of its orbit of planetesimals. Scientists have called Saturn, Jupiter, Uranus and Neptune gas planets in their atmospheres contain gases such as helium, hydrogen, and methane, without knowing with certainty its surface structure. Dwarf planets shortly after its discovery in 1930, Pluto was classified as a planet by the International Astronomical Union (IAU). However, based on subsequent discoveries, a debate was opened by some, in order to reconsider that decision. Finally, on August 24, 2006 the IAU decided that the number of planets is not extended to 12, as proposed in the meeting that kept its members in Prague, but that was reduced from 9 to 8. The big hurt of this new cosmic order was, again, the controversial Pluto, whose small size and its dynamic evolution in Solar system led to the members of the IAU to exclude definitively from its new definition of planet.