A vintage 1970s-style illustration featuring an alien spacecraft landed on a distant exoplanet, with two astronauts exploring the rocky terrain. In the background, a massive green gas giant looms, its swirling clouds casting an otherworldly glow over the scene. The spacecraft is sleek and retro-futuristic, with fins and antennas, while the astronauts wear bulky space suits with reflective visors. The sky is filled with stars, and strange alien plants are scattered across the landscape, adding a sense of mystery and intrigue.