The Great Wall stretches from Shanhaiguan in the east, to Lop Lake in the west, along an arc that roughly delineates the
southern edge of Inner Mongolia. A comprehensive archaeological survey, using advanced technologies, has concluded that the
Ming walls measure 5,500 miles! This is made up of 3,889 miles sections of actual wall, 223 miles of trenches and 1,387 miles of
natural defensive barriers such as hills and rivers. Another archaeological survey found that the entire wall with all of its
branches measure out to be 13,171 miles!
Photographs Taken By Molly Rush
Taken during the course of her visit to China with the Enck Family in Summer, 2013.
Janine Made It!
The Great Wall of China is a series of fortifications made of stone, brick, tamped earth, wood, and other materials, generally built along an east-to-west line
across the historical northern borders of China in part to protect the Chinese Empire or its prototypical states against intrusions by various nomadic groups or
military incursions by various warlike peoples or forces. Several walls were being built as early as the 7th century BC; these, later joined together and made
bigger, stronger, and unified are now collectively referred to as the Great Wall. Especially famous is the wall built between 220–206 BC by the first Emperor of
China, Qin Shi Huang. Little of that wall remains. Since then, the Great Wall has on and off been rebuilt, maintained, and enhanced; the majority of the existing
wall was reconstructed during the Ming Dynasty.
Lepin Made It!
The claim the Great Wall is visible has been debunked many times, but is still ingrained in popular culture. The wall is a
maximum 30 feet wide, and is about the same color as the soil surrounding it. Based on the optics of resolving power (distance
versus the width of the iris: a few millimeters for the human eye, meters for large telescopes) only an object of reasonable
contrast to its surroundings which is 70 miles or more in diameter (1 arc-minute) would be visible to the unaided eye from the
Moon, whose average distance from Earth is 238,851 miles. The apparent width of the Great Wall from the Moon is the same as
that of a human hair viewed from 2 miles away. To see the wall from the Moon would require spatial resolution 17,000 times
better than normal (20/20) vision. Unsurprisingly, no lunar astronaut has ever claimed to have seen the Great Wall from the
Lepin & Rachel