Building for a failure you'll never get to fix
Every lesson in this course points back to the same underlying constraint: once a space robot leaves Earth, the people who built it generally cannot intervene again. That constraint doesn't just shape autonomy and mobility, it shapes the entire culture of how space robotics hardware and software get designed, built, and tested in the first place. Redundancy becomes a default assumption rather than an optional upgrade, with critical systems often built using duplicated components so that a single failure doesn't take down the whole mission. Where a terrestrial robot might tolerate a single point of failure in a non-critical subsystem, space robotics engineers actively hunt for and eliminate single points of failure wherever the mission budget allows, because there is no way to know in advance which specific component will fail, only that something eventually might.
Radiation-hardened components are another direct response to the environmental hazards covered earlier in this course. These parts are specifically designed and manufactured to resist the bit flips and gradual degradation that ordinary consumer-grade electronics suffer under sustained radiation exposure. They're often slower and more expensive than commercial equivalents, which can seem like a strange tradeoff from a purely performance-driven perspective, until you remember that a faster chip which silently corrupts data partway through a multi-year mission is worthless compared to a slower one that keeps computing correctly for the mission's entire duration.