EDIT 12 July 2010: It turns out that JPEG file was a bad choise so here it is in PNG. Now the gradient is far smoother. Plus the rings around the orbit is not visible
Thanks to the user Notmiown (Check out his awesome gallery here: [link]) for great help on making this picture better
I really like this wall, but the banding ruins it. Try redoing the the background gradient in Adobe 1998 colour space. Sometimes blurring will help, sometimes it make it worst. Good luck. If you can fix the the banding I will suggest this to all the wallpaper groups I'm in.
www.hutpixel.blogspot.com
And thanks to Notmiown, for submit this wall in our group..