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THE MARS rover Opportunity, launched in 2004, was only designed to complete a 90-day mission. But thanks to the efforts of many engineers and scientists, it wasn’t until 2019, 15 years later, that it finally stopped sending updates to NASA. 

The more these scientists worked on the device, the more connected they felt to it, says Janet Vertesi, a sociologist of science and technology at Princeton University whose research included NASA’s rover programs. After all, she said, “you don’t just go to the Genius bar and get another one.”