It's a mixture of several screened layers of lightning, stars and various Nasa imagery with a bit of airbrush work. Radial blur(zoom) was used for the background and the glowing 'ELO' earth/disk was altered using layer styles. To top it off, Bjorn's deadly 'Gaussian Flare' filter was administered to finalize the image, mainly to strike fear into the heart of the general populace while lending it a right and proper pimpin'. Hope this helps, Lucian.