Solar system is the planetary system that includes the Sun. and all the objects orbiting it – planets, moons, asteroids. comet. a large number of meteoroids, gas and cosmic dust .
But how was Solar system formed? The universe formed through the Big Bang. There is the Big Bang theory, which says that long ago the universe was small and hot lump. Suddenly it exploded, expanded space, the temperature of the particles decreased considerably. Due to the force of gravity began to gather clouds of matter, the result of which was formed all the galaxies and stars. It took about 8 billion years after the Big Bang, before the Solar system was formed. The matter is unevenly distributed in space and began to attract the dust and gas. Formed dust and gas clouds, they eventually formed star, the Sun. From other particles of the cloud formed other objects.
Components of the Solar system are divided into categories:
3. Small body
The center of the Solar system is the Sun . It accounts for almost all of the bulk system – 99,87 %.
The external part contains the gas giants and their satellites. The inner part of the system consists of four earth-type planets, and asteroid belt. Asteroids are celestial bodies having different sizes from a couple of meters to thousands of kilometers. The asteroid belt is the space of the Solar system, located between the orbit of Mars and Jupiter. It is often called the main belt . which helps to distinguish it from other zones, for example, from the Kuiper belt .
The Kuiper belt – a huge number of small celestial bodies, their orbits are beyond the orbit of Neptune. This cluster of asteroids is almost 20 times wider than the main belt. Pluto – one of the objects of the Kuiper belt was named after the planet, but it belongs to this accumulation, was designated a dwarf planet.
The largest asteroid in the Solar system – Pallada. Previously, Ceres was considered the largest asteroid, has not yet become a dwarf planet.
Through research, we know much not only about our planet but of the Universe. But much remained to be an open and little studied. There are constantly more new facts, which allows us to expand our horizons.