Solar system


The solar system is the set formed by the Sun and the eight planets with their respective satellites that revolve around it, it is also accompanied in its movement through the galaxy or Milky Way by dwarf planets, asteroids and innumerable comets, meteorites and interplanetary bodies. This system is located about 33,000 light years from the center of the Milky Way.

There are many hypotheses about the origin of the Solar System, the most current theories link its formation with that of the Sun, about 4,700 million years ago. From an interstellar cloud of gas and dust that fragmented or collapsed, leading to the formation of a primordial solar nebula, and through the union of larger and larger particles, the formation of today’s planets.

Until August 24, 2006, the planets of the Solar System were nine: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. On that date, the International Astronomical Union created a new class of planet: the dwarf planets, where Pluto became part of them, along with Ceres and Eris; and later, Haumea and Makemake have joined them.

The planets are bodies that move in elliptical orbits around the Sun (translation) and around themselves (rotation). In general, the distance of each planet from the Sun is twice the previous one. The planets, with the exception of Mercury and Venus, have satellites, smaller bodies that revolve around them. The best known satellite is that of the Earth, the Moon.

The planets closest to the Sun are called inner or telluric planets (Mercury, Venus, Earth and Mars), they are small in size, high in density, slow in rotation and have few satellites; The distant planets are known as outer or giant planets (Jupiter, Saturn, Uranus and Neptune), they are large, low density, fast rotating and have a gaseous consistency and a greater number of satellites.

Jupiter is the largest planet, while Mercury is the smallest, Venus in terms of mass and size has characteristics similar to Earth, and Mars known as the red planet is half the mass.

Apart from these main planets and their satellites, there are thousands of small bodies known as asteroids, which are located between the orbits of Mars and Jupiter, in a band called the asteroid belt. Furthermore, we cannot forget comets (balls of ice and dust) and meteorites.