Thick disk

Imagine you are playing with a bunch of Legos. Some of the Legos are small and flat, while others are larger and thicker. Now, imagine that all of the flat Legos are the "thin disk" of the Milky Way galaxy. This is where things like stars and gas are moving around in a flat, organized way.

But there's another part of the galaxy that's made up of the thicker Legos - this is called the "thick disk." The thick disk is further out from the center of the galaxy than the thin disk. It is made up of older stars that are moving in a more disorganized way than the stars in the thin disk. The thick disk also has more dust and gas in it, which makes it harder to see through with telescopes.

So, just like how there are different types of Legos that make up your toy creations, there are different parts to the Milky Way galaxy - the thin disk and the thick disk - made up of different types of stars and material.