Great Wall of China Not Visible From Space: Astronauts Debunk 300-Year-Old Myth

• For centuries, textbooks claimed the Great Wall of China was visible from space, a myth dating back to the 18th century.
• Astronauts, including China's first astronaut Yang Liwei, and NASA confirm the Great Wall is not visible to the naked eye from space.
• The wall's narrow width (4-9 meters) and blend with surrounding terrain make it indistinguishable from orbit.
• The clearest man-made objects visible from space are the vast greenhouses in Spain's Almería province, known as the 'Sea of Plastic'.
• This 'Sea of Plastic' spans 30,000-40,000 hectares and its white plastic sheets reflect sunlight, making it highly visible due to high contrast.