An immense cosmic marketplace floating in the expanse of deep space, composed of ornate floating islands interconnected by glowing bridges and ropes of starlight. Each island hosts surreal stalls and shops, trading exotic cosmic oddities like living nebulae in glass orbs, miniature planetary systems in brass cages, or bottled auroras shimmering through intricate glass vials. Vendors, clad in elaborate retro-futuristic attire with luminescent embroidery, demonstrate curious alien inventions and mystical artifacts surrounded by vintage neon signs proclaiming cryptic slogans in an unknown celestial language. Strange alien customers inspect items with telescopic monocles and communicate in shimmering symbols hovering above their fingertips. Rendered using dramatic cinematic composition with soft airbrush detailing, bold retro color contrasts between vibrant rose, electric teal, gold, and deep cosmic violets to evoke nostalgia-infused wonder consistent with striking mid-20th-century surrealist cosmic illustration. <lora:retro-futurist-cosmic-surrealism-flux:0.75>