An advanced alien species uses the energy from the nebula that dominates its star system to fuel a powerful shield around its planet, designed to protect them from enemies, real and imagined.
Loosely based on the planet of Aperta, home of the Diramae and a destination in my Mass Effect-related fanfic, "If It Meant Living: Beyond," in Chapters 13: [link]
through 15: [link]
Created in Photoshop CS6. Download for full size (4800x2700).