Even the Chinese agree with French astronaut Jean-François Clervoy: the great wall of China is NOT visible to the human eye from space, not even from a low orbit. Chinese astronaut Yan Liwei, who orbited the earth fourteen times in a Chinese spaceship, couldn’t see it either.
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Caption 2 [fr]: Lorsqu'on parle de la Grande Muraille de Chine, les chiffres sont astronomiques. Caption 2 [en]: When one talks about the Great Wall of China, the figures are astronomical.