Another thing you can do for a star is create a polygon the size you want the star to appear as and put it in the distance with glow enabled and the luminoscity cranked up. I love rendering space scenes and have been perfecting my backgrounds. One picture I rendered of a sun, my mom saw it and thought it was an actual image... here's a pic of the sun with some point poly stars in the background with glow enabled, this render was before I turned off the anomorphic streaks to create a more realistic look, and I'm also still working on perfecting the sun. But anyway; Good luck, and let us know how your render turns out (hope this helps).
