Perhaps most visible from low Earth orbit are cities at night. Of the wall visibility theories, Lulla said: "A lot has been said and written about how visible the wall is.
Cities can be seen during the day too, as can major roadways and bridges, airports, dams and reservoirs. In fact, it is very, very difficult to distinguish the Great Wall of China in astronaut photography, because the materials that were used in the wall are similar in color and texture to the materials of the land surrounding the wall -- the dirt." It's questionable whether you can see it with the unaided eye from space.
If the evidence checks out, it will prove that the oldest humans to arrive and settle in India came almost 15,000 years before the time it is usually believed that they did.
The excavation of these tools can be seen as a pointer of Toba eruption theory.
The red arrows point to other visible sections of the wall. View larger image The issue surfaced again after photos taken by Leroy Chiao from the International Space Station were determined to show small sections of the wall in Inner Mongolia about 200 miles north of Beijing. One was displayed prominently in the nation's newspapers.