The term rover refers to a self-contained mobile robot that functions as an electromechanical extension of a remote human operator. The first Mars rover was Sojourner, used in the 1997 Pathfinder mission. An operator, comfortably seated in Mission Control, sees Mars through the eyes of the rover, which are far better than human eyes; they can focus on a grain at the foot of the rover or a distant mountain. ?Sojourner never broke for coffee or complained about the cold nights. Spirit and Opportunity, twin rovers, followed. For a time they seemed almost immortal, but with rovers, as with people, they finally just wore out.
Source: http://feeds.slate.com/click.phdo?i=b2f1220de0459e84563c3f13399502a7
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