A vibrant and colorful retro sci-fi scene featuring a 1950s-style diner perched on an asteroid, surrounded by a bustling array of flying cars zipping through the starry expanse of space. The diner glows with dynamic neon lights, casting an array of brilliant colors across the rocky surface of the asteroid. Intricate details adorn the exterior of the diner, with large, bubble-shaped windows offering a glimpse of patrons enjoying a meal inside. The flying cars have sleek, vintage designs with chrome finishes and vivid hues, creating a lively flow of movement against the cosmic backdrop filled with distant stars and swirling galaxies. This dynamic and detailed 4K image captures the nostalgic charm of retro-futurism with a modern twist.