Spirit & Opportunity

NASA's Mars Exploration Rovers, designed for 90-day missions. Spirit lasted 6 years. Opportunity lasted 15 years, traversing over 28 miles of Martian terrain — a marathon on another planet. These golf-cart-sized rovers discovered evidence that water once flowed on Mars, fundamentally changing our understanding of the planet. Their extraordinary longevity came from robust engineering and smart power management. They represent the gold standard for building machines that operate far beyond their design parameters in harsh, unstructured environments.