Create a Realistic Space Scene from Scratch with Photoshop

In this intermediate-to-advanced-level design tutorial, we are going to create a stunning space scene that has realistic-looking planets, stars, and lighting effects using a few innovative Photoshop techniques and some textures.

Source:
http://sixrevisions.com/tutorials/photoshop-tutorials/create-a-realistic-space-scene-from-scratch-with-photoshop/