A vibrant retro sci-fi scene featuring a 1950s-style diner perched on a bustling asteroid, surrounded by a constellation of flying cars zipping through the star-studded cosmos. The dynamic lights of neon signs cast colorful reflections across the diner's chrome surfaces, illuminating intricate details of the futuristic architecture. Hovering robotic waitstaff serve patrons, creating an atmosphere of nostalgic futurism under the swirling hues of distant nebulae. The entire image glows with rich, vivid colors, capturing the essence of a lively interstellar pitstop in spectacular 4K detail.