solar system
We all studied about Solar system in geography.
Also, we studied about structure of atom in science.
We came to know all material is made up of small particles known as atoms.
We also came to know that even the smallest atom which is known as atom is made up of even smaller particles known as electrons, protons and neutrons.
The protons and neutrons stay in the center of particle called nucleus whereas the electrons revolve around the nucleus in various orbits.
If you compare both solar system and structure of atom, both has similar patterns –
In Solar system Sun is at the center and planets revolve around it in various orbits, similarly in an atom, electrons revolve around the nucleus in various orbits.