A vibrant retro sci-fi scene showcasing a 1950s-style diner perched on a rocky asteroid, surrounded by a myriad of flying cars with sleek, chrome finishes and neon lights. The vastness of space serves as a backdrop, dotted with distant stars and swirling galaxies, casting ethereal glows that dance over the scene. The diner itself, adorned with vintage signage and classic checkerboard flooring, emits warm, inviting lights that cut through the cold space around. The cars zoom and hover in graceful choreography, with trails of light painting dynamic paths in the cosmos. The entire tableau bursts with color, from the bright reds and teals of the diner's exterior to the shimmering hues of the astral sky, rendered in intricate 4K detail that captures every nuance of this cosmic retro-futuristic dreamscape.