Few years back I tried making a spiral galaxy using a particle system and some post processing. It didn’t turn out all that great. This is my latest attempt after following a tutorial by @CBaileyFilm. It looks a lot better though its still not realistic as I would like. A really realistic render will probably have to wait til after I learn more about volumetrics, making nebulae and get a better computer.
Does make for a nice desktop wallpaper and the technique will be very handy for some future renders with space craft. I need to also do some with planets and asteroids soon as well.