Spirit investigating ancient rocks NASA

Spirit had a productive week investigating the rock “Tetl.” On sol 277, Spirit attempted a drive to the next rock target, “Uchben,” which means “ancient” in the old Mayan language. Halfway into that drive, Spirit experienced a repeat problem in the steering motor control system that engineers first saw on sol 265. Engineers repeated diagnostic tests for the problem on sol 278. Those tests showed that the electronics relay in question is still functional, but appears to operate intermittently. Spirit is otherwise healthy and is in a safe location.