This is my first attempt at creating a nebula.
The blue/green area is based on perlin ridges, to make them look like thin filaments of gas,
the reddish area is based on perlin billows and represent dust.
Basically they're huge colored clouds in space. The sun is sitting behind the bright area.
I originally planned to lower the brightness, but i'm happy the way it turned out.
The planet could use some work, but i'll get to that sometime this week.
I've also added two additional (off screen) light sources, yellow and orange.