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The package with the book arrived here on Friday already.Image above: While the Great Wall of China is very difficult to see or photograph from low Earth orbit, sections of the wall can be seen readily in radar imagery.This image of sections of the wall in a desert about 435 miles west of Beijing was made by the Spaceborne Imaging Radar flown aboard the Space Shuttle Endeavour. Lulla, NASA's chief scientist for Earth observation at Johnson Space Center in Houston, directs observation science activities from the Space Shuttle and the International Space Station. It appears that the right set of conditions must have occurred for this photograph to capture the small segment of the wall." It was a sunny day and a recent snowfall had helped make the wall more visible. The Great Wall of China, frequently billed as the only man-made object visible from space, generally isn't, at least to the unaided eye in low Earth orbit. You can, though, see a lot of other results of human activity.The visible wall theory was shaken after China's own astronaut, Yang Liwei, said he couldn’t see the historic structure.