Create one finished standalone photographic website background image, 21:9 ultrawide, approximately 2520 by 1080 pixels. Theme: Astral atlas. Scene: An extreme panoramic edge-on view of a razor-thin gold accretion plane, its central lensing arc small and offset right. Art direction: Cinematic astronomical concept art with physically convincing star light, delicate dust and extraordinary scale. Deep black, icy silver, amber and restrained red. Avoid purple, rainbow nebula wallpaper and oversized glitter. Composition: retain generous low-detail top space suitable for overlaying website copy, adapting subject placement naturally. This is the actual background artwork, not a website mockup. No text, letters, typography, logos, borders, collages, grids or watermarks. Full-bleed, polished, richly detailed at native resolution.