In a retro science fiction scene reminiscent of 70s book art, an alien spacecraft with sleek, angular lines is nestled on the surface of a mysterious exoplanet. Twin astronauts, clad in vintage space suits with reflective visors, stand in awe beside the craft, surveying the alien landscape. Towering in the background is a vibrant green gas giant, its swirling clouds creating mesmerizing patterns in the planet's thick atmosphere. The scene is bathed in an otherworldly palette of deep blues and vibrant greens, capturing a sense of wonder and exploration amidst the vastness of space.