Every Photoshop tutorial writer should have a space explosion effect in their arsenal. It’s kind of like a right of passage. This is my interpretation of a space scene. The fun part about working with a space scene, is that you can let your imagination go crazy. Please use this tutorial as a guide, but don’t feel limited by it. It’s by experimenting and playing with your own techniques that you’ll learn the most, and create something unique.
LINK:
http://www.myinkblog.com/2008/07/22/creating-an-awesome-space-effect/