The Solar System is the region of space over which the Sun has gravity attraction. We can imagine it as a huge bubble floating in space.
There is an invisible border, which is the place where the solar wind and charged particles go around. Everything that remains within that space is part of the Solar System: the Sun, planets, minor celestial bodies, stardust particles, cosmic rays, and all interplanetary space.
When the Sun formed, the fragments of surplus star material remained orbiting around it. The material was grouped to form the rest of the celestial bodies. They are very numerous, but almost all are concentrated in certain areas. The Solar System was ordered and structured as follows:
Sun: It occupies the center and everything orbits around it. This is more than 99% of the mass of the entire Solar System. It emits the gravity that holds the System together. From it the solar wind and millions of tons of plasma and charged particles, responsible for space weather.
Indoor Solar System: It is the region closest to the Sun, the hottest and densest in the System. To him belong the 4 rocky planets: Mercury, Venus, Earth and Mars. Also the Moon and the two natural satellites of Mars. Earth occupies the ecosphere of the Solar System, that is, it is at the proper distance from its star in order to house life. Beyond Mars, an asteroid belt marks the border of the inner Solar System. Probably, Jupiter's gravity prevented them from forming a planet. In it, the dwarf planet of Ceres.
Outdoor Solar System: the farthest and coldest areas. In it are the gas giants: Jupiter, Saturn, Uranus and Neptune. They add 90% of the remaining mass. They formed of rock and ice and, being much larger than rocky planets, attracted a lot of gases. Jupiter's mass is more than 2.5 times that of the rest of the planets together. There are lots of natural satellites. Among the gas giants they add more than a hundred. Beyond the planets, the Kuiper belt, a belt of icy bodies and dwarf planets like Pluto, Eris, Makemake and Haumea. In the furthest area, the Oort Cloud, where comets come from.
The outer Solar System is much larger than the inside. The distance between Mars and Jupiter, and between any of the outer planets is much greater than the distance between Mars and the Sun. The Oort Cloud is 1.6 light years away.
|Oort Cloud||9,500,000 (9.5 billion)|
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