What makes the Great Wall of China the only man-made object visible from space?
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What makes the Great Wall of China the only man-made object visible from space?
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more remarkably, it's the only human artifact on Earth visible from the moon. Both are false, say astronauts and remote-sensing specialists. Although the Great Wall spans some 4,500 miles (7,200 kilometers), it's constructed from materials that make it difficult to discern from space.