My first shot like that was six years ago and was a small globe filled with colored gelatin. The result was really pretty so i kept messing with the idea over the years.
I have filled globes with gelatin, water, sand, cream, even liquid nitrogen.
This photo shows yet another filling, colored tempera. It took me a few tries to get what I wanted, but it looks good. The globe is being blasted with a fast moving steel ball.