Great Wall while tens of thousands of, but the average width but 10 meters, and narrow irregular, for the flying height of spacecraft reached 300 kilometers, only 500 meters wide buildings can greeted, 10 meters wide wall clearly enough standard.
And the south, and that’s his NASA’s argument. NASA has told the club’s official website, in writing by other amplification tool circumstances, can actually seen from space, the earth, but many man-made project wall would not be included. Specifically, the Great Wall is not adopted, and the width of the building materials with the color, the color is very close to surrounding scenery.
Nov 25 2009