Okay, imagine you have a bunch of different toys in your toy box. Each toy is like a molecule, which is a tiny piece that makes up everything around us, including stars.
Now imagine you and your friends are playing outside at night and you see all the little lights up in the sky. Those are called stars!
Inside those stars, there are toy-like molecules made up of different types of atoms. They stick together and create different shapes and sizes, sort of like when you stack your toys to make a tower.
These molecule-toys are really important because they give off energy as they move around in the star. This energy is what makes the star shine and gives us light at night.
So without these little molecule-toys, there wouldn't be any stars for us to see up in the sky!