The reason because this art have so much colours is colour noise, which became the source of most small stars.
wow =) i like the stars! looks very good
Wow, this is great! I love the texture on the planets.
looks really really good
That background is outrageous. I'm highly impressed. - fav'd
Without the ship and gas giant/moon, which are both pixeld quite niecely btw., this would make up for a real nice wallpaper.
Must be one of the best deep space pixel pieces I've ever seen. The nebulas, galaxys and stars look terrific! :)