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1994年,美国登月航天员巴斯·奥尔德林曾在《科学》杂志上澄清,站在40万千米之遥的月球上,是无法用肉眼看到中国的长城的。不仅如此,另一个长期存在的说法也是错误的:长城是太空中唯一可用肉眼观察到的人造物。
In 1994, astronaut Bath Alderlin of the United States once clarified in Science that it is impossible to see the Great Wall of China from the naked eye as it stands on the moon 400,000 kilometers away. Not only that, but also another long-standing assertion that the Great Wall is the only man-made artifact visible in the sky.