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CHINA’S WALL LESS GREAT IN VIEW FROM SPACE
The Great Wall of China, for a long time considered the only man-made object recognizable
from space, is in fact invisible, 8.1. _______________ least to the unaided eye in low Earth
orbit.
Recently an orbiting astronaut from China said he couldn’t see the monumental structure. The
Chinese were devastated as the Great Wall is their national treasure. With
a 8.2. _______________ of more than 2,000 years, it is one of the most appealing tourist
attractions.
Whether the Wall is visible from space has often been called into question. It is very difficult
or even impossible to distinguish it in astronaut photography because numerous factors must
be 8.3. _______________ into consideration. Firstly, the material from which it is made is the
same colour and texture as the area surrounding it. 8.4. _______________ from the material,
other factors like the shape of the structure, the resolution of the photo camera, and the condition
of the atmosphere also make images of the area difficult to interpret.