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Is it true that the Great Wall of China can actually be seen from the moon and if not, can any man-made creation be seen from there?
Question
#27606. Asked by Lammel.
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Kainantu
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NASA says: The Apollo astronauts never did see the Great Wall of China from the moon, as had been reported. But it is easily visible with space radar. The two spaceborne radar images at this site, show part of the Great Wall of China as it passes through a desert region in north-central China, about 400 miles west of Beijing. Two walls can be seen right next to each other in the enlarged section. The left wall is newer, built around 600 years ago during the Ming Dynasty. This wall is 16-26 feet high in this area. The right wall is more ragged looking. It was built 1500 years ago during the Sui Dynasty. Parts of it are covered by dirt and blowing sand. Features such as the Great Wall are easily seen with spaceborne imaging radar because the wall's steep, smooth sides strongly reflect the radar beam. The images were taken by the Spaceborne Imaging Radar-C and X-Band Synthetic Aperture Radar (SIR-C/X-SAR) onboard the space shuttle Endeavour on April 10, 1994. SIR-C/X-SAR is a joint mission of the German, Italian, and United States space agencies, and part of NASA's Mission to Planet Earth. http://observe.arc.nasa.gov/nasa/ootw/1996/ootw_960605/ob960605.html
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