Apollo software pioneer Margaret Hamilton dies at 90

Margaret Hamilton, the computer scientist who led the development of software for NASA’s Apollo missions, died September 30 at age 90, the Massachusetts Institute of Technology confirmed. Her team’s work helped guide Apollo spacecraft, including Apollo 11, whose lunar landing continued after an onboard computer alarm. Hamilton joined MIT in 1959 and worked there until the mid-1970s. After MIT received a NASA contract to develop Apollo flight software, she led engineers who designed and tested programs for the spacecraft’s command and lunar modules. The software supported the missions’ onboard operations, and Hamilton became a leading figure in the emerging field of software engineering. During Apollo 11’s 1969 landing, the onboard computer raised an alarm shortly before touchdown. Accounts describe the problem and the software response in different ways, including an overloaded computer and an attempted shift to radar processing. They agree that the software gave priority to essential tasks and that the landing proceeded. Hamilton later said the system detected a hardware-related problem and restored the highest-priority tasks.