"Design an eye-catching image featuring flat rectangle shapes infused with captivating space-inspired elements. Incorporate sleek lines, bold colors, and minimalist compositions to create a modern and visually striking aesthetic. From geometric planets to cosmic landscapes, let your imagination soar as you blend the allure of space with the simplicity of flat design. Whether it's a futuristic city skyline against a backdrop of stars or a constellation of geometric shapes floating in the void, craft an image that captures the essence of the cosmos in a fresh and dynamic way."