Voyager 1 Survives on Kilobytes: Redundancy Keeps a 1970s Spacecraft Alive

Voyager 1, launched in 1977, still runs on three main computer systems with about 69.63 KB of memory each and continues to receive and execute Earth commands nearly five decades later. The mission’s built‑in redundancy—across the Computer Command Subsystem, Flight Data Subsystem, and Attitude and Articulation Control Subsystem—along with flexible software allowed engineers in 2024 to reroute around a damaged memory chip after a memory corruption event, masking the fault by relocating code to unused memory. Despite aging hardware and the vast 24+ billion-kilometer distance, the craft demonstrates how carefully designed, low-power systems can outlive their original lifespans through redundancy and adaptable software.