The "Face on Mars" Illusion

A mesa in the Cydonia region of Mars, which, due to specific lighting and resolution, resembled a human face in images captured by NASA's Viking 1 Orbiter in 1976.

Sources

• The Face on Mars: Fact & Fiction - Space
• Geologic 'Face on Mars' Formation - NASA Science
• The 'Face on Mars' - NASA Science
• A face on Mars | The Planetary Society
• The face on Mars, from conspiracy to debunking. How this Martian feature sparked decades of conjecture

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