This image was created after reading an article 3D Design about simulating gases in 3D programs that didn't natively support such a feature.
I thought that the technique sounded interesting and decided to try it out. The technique involves creating the gases as clouds of small particles, rendering them in a separate image, blurring the particles and compositing them back into the original image.
Unfortunately, I cannot take responsibility for the creation of the image that makes up the surface of the moon. This was downloaded from an internet site along with several other planet surface maps.