What's the Difference Between Vapor and Solid?

The inner planets are mostly made out of rocks because of where they are. But that doesn't mean there aren't rocks and metals out there in the outer solar system. Jupiter probably did begin as just metallic or rocky blob. And then it gathered all that gas up with it. They also definitely have some rock and some metals inside of them. The density is this combination of size and mass, right? So you might imagine that the densest things would be in the inner solar system. That's kind of interesting to think about.