I could write on this topic for at least two dozen famous books and series (off the top of my head, I'm thinking of Harry Potter, Lord of the Rings, Star Trek, Star Wars, and many DC and Marvel comics), but I think this one is particularly fun because it extends beyond Earth.
Dune is a huge series. Sure, this week, we're only reading the first novel. (Which is huge enough as it is.) But there are many other books, short stories, and don't forget the movies. Since it's set on a fictional planet, and lots of other fictional planets, you can imagine that the world gets pretty big.
Here's a list of the planets in the Dune universe (the Duniverse, if you will).
Go on, go read it. It's from Wikipedia. Check out the fact that a lot of those planets have information about real-life things in space that are named after them! Like Arrakis (the primary planet in the story) being the name given to a plain on Saturn's moon, Titan.
I'd like to think that if Frank Herbert were still alive, he would think that's pretty darn cool.