Thank you so much for your kind words Spectre. I did try a smaller arc, varying it around a little, but this one sort of made it stand out a little more so. As for the edge, I looked at some stock photos of planets etc (even artists ones) and yes, they all seem to have a glow to the edge, so a mistake on my part, but looks cool anyway.
I'll look for it (bulge) and the other as well I do have those other plug ins, and I did use AA assistant, but I remember reading the tutorial and I should have done it a couple of times perhaps
If only I could get my head out of Scifi, I might make something more earthy Lol....but thank you all the same, I really appreciate it.
Oh, on the lighting, I cheated. Because the plug in here (the one that is supposed to copy PS lighting effects), crashed so I had to take it out. I did the whole pic, then had a friend of mine at the star behind the ship. The one around the planet is part of the stock photo.