NASA is trying to diagnose the cause of the Mars Exploration rover Spirit’s recent erratic behavior. On Jan. 25—the 1,800th Martian day of what was originally baselined as a 90-day mission—Spirit failed to respond to its daily driving commands, and did not record its main activities for the day onto its hard drive. The next day, controllers at the Jet Propulsion Laboratory sent a command for Spirit to locate the Sun with its camera, on the hunch that the rover might be disoriented. Spirit ...


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