The Solar System is the Sun and all the objects that orbit around it. The Sun is orbited by planets, asteroids,
comets and other things.
The Solar System is about 4.6 billion years old. It formed by gravity in a large molecular cloud. Most of this matter gathered in the center,
and the rest flattened into an orbiting disk that became the Solar System.
It is thought that almost all stars form by this process.
It contains 99.9% of the Solar System's mass.
This means that it has strong gravity.
The other objects are pulled into orbit around the Sun.
The Sun is mostly made out of hydrogen, and some helium.
There are eight planets in the Solar System. From closest to farthest from the Sun,
they are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
The six largest possible dwarf planets, and many of the smaller bodies are orbited by natural sates, usually termed "moons" after the Moon. Each of the outer planets is encircled by planetary rings of dust and other small objects.
The solar wind, a stream of charged particles flowing outwards from the Sun, creates a bubble-like region in the interstellar medium known as the heliosphere.