A planet inhabited solely by robots might sound like something out of science fiction, but it is all too real and much closer than you might imagine. Our nearest planetary neighbor, Mars, is the only known planet to be entirely inhabited by robots.
Fourteen spacecraft have visited Mars since 1971, leaving a number of artificial objects on its surface. These missions included seven rovers. Two of the rovers, Opportunity and Curiosity, are still operational.
Categories: Astronomy and Space, History, Science, Technology
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