We live in a planetary system formed by the Sun and the celestial bodies that orbit around them, among them, our Earth. There are many solar systems in the Universe, but we call this simply the Solar system, That's what ours is for!
Well, in "our" Solar System there is a star, the Sun, which keeps many stars and diverse materials spinning around it under the influence of gravity: eight large planets, along with their satellites, smaller planets, asteroids, comets, interstellar dust and gas. And we are.
It belongs to the galaxy called Milky Way, formed by billions of stars, located along a flat disk of 100,000 light years.
The Solar System is located in one of the three spiral arms of this galaxy, called Orion, about 25,800 light years from the nucleus, around which it rotates at the speed of 250 km per second, using 225 million years to go around complete. We call this time galactic year.
What is the solar system? How is it formed?
Besides of Sun, which is a star, astronomers classify the planets and other bodies of our Solar System into three categories:
• First category: A planet solar is a celestial body that is in orbit around the sun, with enough mass to have gravity and maintain hydrostatic balance. The planets have a round shape and have cleared the vicinity of their orbit. Our solar system has four terrestrial planets or interiors (Mercury, Venus, Earth and Mars) and four gas giants exteriors (Jupiter, Saturn, Uranus and Neptune). From Earth onwards, all planets have satellites that orbit around it.
• Second category: A dwarf planet It is a celestial body in orbit around the Sun, with enough mass to have a spherical shape, but not enough to have cleared the vicinity of its orbit. They are: Pluto (until recently listed as planet), Ceres (formerly considered the largest of the asteroids), Makemake, Eris and Haumea. For now.
• Third category: All other objects that orbit the Sun are collectively considered as "small bodies of the Solar System". This category includes the asteroids (with irregular shapes, most in the asteroid belt, between Mars and Jupiter), the objects of the Kuiper belt (Sedna, Quaoar), the kites Ice creams from the Oort cloud and meteoroids, which are less than 50 meters in diameter.
In addition, the Solar System contains small solid particles that form the so-called cosmic powder and gases
Where does the solar system end?
It is not known exactly how far the Solar System goes. It is said that "until the heliopause", located about 16,000 million kilometers from the Sun, which is the distance at which the influence of the solar wind. As something is far, for now, we leave for another day to go check it out.
In AstroMía you can also take a visual tour through the collection of Solar System images, each conveniently explained.
In this chapter:How is our Solar System ?: The Solar System is formed by a central star, the Sun, the bodies that accompany it and the… Read page How the Solar System was formed ?: It is difficult to specify the origin of the Solar System. Scientists believe that it can be located about 4 ... Read pageThe Sun is our star: The Sun is the closest star to the Earth and the largest star in the Solar System ... Read pageStructure and composition of the Sun: From Earth we only see the outer layer of the Sun. It is called photosphere and has a temperature of about 6… Read page Solar activity: Solar activity is manifested and can be observed in various ways: spots, bumps or flares and solar wind… Read page Planets: The planets are spinning stars around a star, the Sun. They have no light of their own, but reflect sunlight ... Read page