A bustling retro-futuristic diner perched on an asteroid floats amidst the vibrant void of outer space, drawing in cosmic voyagers with neon allure. Sleek flying cars, reminiscent of 1950s design with chrome accents and tailfins, zip through the star-studded expanse, casting dynamic, multicolored trails of light that dance across the rocky surface. The diner itself, an architectural time capsule, glows with vibrant reds, blues, and greens, surrounded by a galaxy of intricate details; vintage neon signs flicker alongside holographic menus, while patrons from diverse worlds gather at checkered booths, enjoying synthetic milkshakes under the rotating, radiant beams of space-age chandeliers. The scene is a kaleidoscope of color and detail, capturing the whimsical spirit of retro sci-fi merged with the limitless possibilities of the cosmos, rendered in ultra-high-definition clarity.