A vintage-style depiction of a mysterious alien spacecraft resting on the rocky terrain of an exoplanet, with two astronauts exploring its intricate design. In the background, a massive green gas giant looms over the landscape, casting an ethereal glow. The scene is set under a starry sky, with hints of vibrant nebulae adding color to the darkness. The astronauts, clad in retro-futuristic suits, cautiously approach the spacecraft, their reflections subtly mirrored on its metallic surface. The atmosphere exudes a sense of wonder and discovery, capturing the adventurous spirit of 1970s science fiction.