The Solar System is the Sun and all the objects that travel around it. The Sun is orbited by planets, asteroids, comets and other things.

Planets and dwarf planets of the Solar System. Compared with each other, the sizes are correct, but the distances are not

The Solar System is about 4.568 billion years old. The Sun formed by gravity in a large molecular cloud. It is mainly hydrogen, which it converts into helium through nuclear fusion. The planets are in a flattened orbiting disk. This disk was partly left over from the cloud that formed the Sun, plus other material as the Sun moved through space. Eventually, the gas and dust of the disk came together into planets. It is thought that almost all stars and their planets form this way.