A stunning poster in soft line art style, depicting the grandeur of humanity's journey into the cosmos. A vast, starry sky forms the backdrop, dotted with galaxies and nebulae, as sleek spacecraft glide gracefully through the void. In the foreground, a futuristic space station orbits a vibrant Earth, its intricate design rendered with elegant, flowing lines. Astronauts in sleek suits float weightlessly, conducting experiments, while below, the Earth's surface showcases sprawling cities and serene oceans. The art is imbued with a sense of wonder and optimism, with soft, glowing hues and gentle gradients blending the terrestrial and the celestial into one harmonious vision.