There a lot of space tutorials out there some are better than others, i have managed to try and select a few of what I think can allow you to get great effects that look like they belong and don’t look completely Photoshopped.
I tried to be as varied as possible so there are tutorials for creating planets, stars, nebulas and atmospheric type gasses. The great thing is that they lay down the building blocks to experiment and create you own stunning universe.
This tutorial shows you how to create some great gas explosions coming from the planets atmosphere with some pretty simple tools, yet looks stunning
Create realistic star fields, the trick with this one is to be totally random and keep building up your layers the end result will speak for it self, with an image that looks like its evolving.
Create simple yet affective star fields in 8 easy steps.
I think if you have the time to do this tutorial it would be very worth while, the end result is very realistic and it seems is one of few great galaxy tutorials.
This is a much simpler way to create a Nebula with different techniques but with a similar stunning result.
How to create a space nebula that looks like its bursting at the seems and full of life, you will need to download a brush pack for this tutorial, but the link is broken on the tutorial site to download them, but don’t worry I have managed to find them for you here: Rust-n-Grunge brushes
One of my favourites as it is relatively easy to accomplish yet the planet can look totally realistic with its surface glow and texture effect.
This is a similar tutorial to the one above but will show you what other outcomes can be achieved with this method.
A smart and simple way to create a realistic looking asteroids from nothing but photoshop. If you cant view the tutorial you can find it on this tutorial page instead
An extremly fast and simple way to add rings around your planet like Saturn has.
With this Nebula tutorial it shows a different technique using Photoshops preset brushes and filters to create a vivid result.
I think the end result could be better but i like the way the glowing crater and asteroids were created i think with some more motivation the end result could look truly amazing.
Quite a lengthy tutorial but a few smart ideas as well such as using a garden rock as an asteroid, with a pleasant explosion to great affect
A very dramatic explosion with terrific light effects.
This one is different again and is created by using a brushing technique which gives it a unique look, i would say this is quite an advanced technique and would take much longer than most of the others listed. If you cant view the tutorial you can find it on this tutorial page instead
A modern take on lighting effects to create a spectrum of colour within space.