viernes, 17 de octubre de 2008

The Great Wall from Space

( mercredi 12 mai 2004)
Proba, the polyvalent satellite launched in 2001 by the European Space Agency (ESA), was able to capture images of the Great Wall from space taken at an altitude of 600 km.
China has cherished for decades the idea that the Wall was just about the only manmade object visible to astronauts from space.
According to American astronaut Eugene Cernan, speaking during a visit to Singapore: "In Earth's orbit at a height of 160 to 320 kilometres, the Great Wall of China is indeed visible to the naked eye."
http:/bilingual-library.blogspot.com

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