Attached Link: http://www.solarvoyager.com/tutorials.asp

Hi Rosie, 

Nice work. One small niggle is one of your galaxies appears to be in front of the earth. I'd suggest to anyone who wants to create their own space art to give these tutorials a go. The one by Greg Martin on how to create a starfield is very good. It's easier if you have a tablet, but my first attempt (above) wasn't too bad when using a mouse.

Another way to lose the cut off effect would be through layer masks. I'd render the foreground as it is with a blank sky. Then add first your planet on a seperate layer allowing you to fade it in using the mask and the same applies to the star field which would be layered behind the planet. 

http://joevinton.blogspot.com/