A colossal nebula metropolis suspended within a massive interstellar cloud, towering crystalline spires rising from swirling cosmic gas and dust, luminous plasma filaments creating ethereal street lights between glass biodome districts, sleek quantum craft navigating through colorful hydrogen and helium mists, sky gardens blooming from transparent platforms overlooking infinite cosmic vistas, deep violet and electric magenta palette with iridescent stellar nursery glow illuminating impossible astronomical architecture, epic wide shot with tiny silhouetted astronauts on observation decks emphasizes cosmic city scale, photorealistic, cinematic depth of field