Create a vibrant, circular refrigerator magnet illustration centered around the theme of 'Mars' exploration, featuring a stylized, bold, red planet with craters and valleys, set against a dark blue, starry night sky with a subtle gradient effect, surrounded by orbiting spaceships, astronauts in suits with reflective visors, and robotic rovers, all rendered in a mix of digital and hand-drawn styles, with bold lines, vivid colors, and textures, incorporating elements of futuristic technology and adventure, with the planet Mars prominent in the composition, taking up most of the space, and the surrounding elements arranged in a circular pattern to fit the shape of the magnet, with a subtle, metallic sheen to give it a sense of realism and depth.