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We're not exactly sure yet. Picture taken by the Viking 1 orbiter in July 1976 from a range of 1873 km. When the 1976 Viking 1 orbiter took pictures of Mars in search of a landing site for Viking 2, it snapped a photograph of a mile-high feature that looked remarkably like a human face. Located in a region called Cydonia , most NASA scientists say the face is a natural formation. Others however, believe that the face was built up by alien life on Mars.