Talk:1921: The Moon and the Great Wall

https://www.nasa.gov/vision/space/workinginspace/great_wall.html

gives something like an authoritative explanation togeter with photos taken from the ISS.

Summary: the great wall can't really be seen from space. But you may be able to spot its shape if the conditions are right. Such as light from the right direction (see the shadow), or snow accumulating on one side of the wall but not the other.

Jyrki Lahtonen

"The statement in the comic, however, is actually true." - It might be, but the part about the Great Wall in it is somewhat irrelevant - it is equally true also from anywhere else in the world. 162.158.210.88 09:49, 27 November 2017 (UTC)

Yeah it's simply a reversal of the myth. "The Great Wall of China" could be replaced with "anywhere on Earth". But that would be less funny. Jdluk (talk) 10:27, 27 November 2017 (UTC)

The Great Wall is 13,000+ miles long, but only 35 feet wide. It's the narrowness that make it impossible to see from space. If we use thread (approx 1/100th of an inch wide) as an analogue, the GWC can be represent by a piece of thread 732 ft long (1.5 inches equals one mile), viewed from 5.5 feet away (equivalent to the 100 miles "edge of space"), or 1222 ft (22,000 miles geosynchronious orbit) or 2.5 miles (238,855 miles orbit of the moon) JamesCurran (talk) 15:07, 27 November 2017 (UTC)

That's simply false. The Great Wall of China is another structure on the surface of a celestial body that can be seen with the naked eye from the Great Wall of China. --172.68.54.34 19:05, 27 November 2017 (UTC)

Those merlons are way too small. They are not going to protect Megan & Ponytail from incoming arrows. --172.68.54.34 19:08, 27 November 2017 (UTC)