The post-90s sixth-grade Chinese textbook has a text called "Great Wall Brick", which mentions that an astronaut who once stepped into space can see the Great Wall of China with the naked eye.
The original text is like this
"Truly remarkable!" One astronaut said with great excitement, "I am on a spaceship, observing our planet from beyond the sky, and I can only recognize two projects with the naked eye: one is the Holland sea levee, and the other is the Great Wall of China!"
It is precisely because of this text that in the childhood memories of the post-90s, the fact that the Great Wall can be seen in space is deeply imprinted in the mind.
Later, there was also a saying that the Great Wall could also be seen on the moon, which originated from the Qianlong period of the Qing Dynasty.
A British collector once wrote in 1754 that the Great Wall could be seen on the moon. In 1904, a British writer wrote this statement in the book "People and Politics in the Far East", and since then the great wall can be seen on the moon has been circulated in the last years of the Qing Dynasty.
After all, no one had ever been in space at that time, let alone landed on the moon, so this statement could not be confirmed at that time, and people believed in the majesty of the Great Wall and naturally thought that the Great Wall could be seen on the moon.
Now that China has its own space station, some people suggest that China's three astronauts take a closer look at the ground on the space station in their spare time to verify whether they can see the Great Wall through the naked eye.
In fact, there is no need for astronauts to verify it personally, because the limit of human visual discrimination is to see an object 10 meters away from 36 kilometers away, which is still carried out in the case of excellent air visibility.
The orbital altitude of the Chinese space station is 340 km to 450 km. Even at an altitude of 340 kilometers at the lowest orbit, objects 10 wide cannot be seen. What's more, the maximum width of the foundation of the Great Wall is 6.5 meters, and it is impossible to see at all.
Unless the astronauts of the space station use high-powered telescopes, it is completely impossible for the naked eye to see the Great Wall.
The Great Wall cannot be seen on a 400-kilometer space station, let alone on the moon 380,000 kilometers away.
Seeing the Great Wall on the moon is as difficult as seeing an ant on the ground on an airplane.
Now that China has already carried people into space, have Chinese astronauts personally verified that they can see the Great Wall from space?
Yang Liwei personally verified it
Yang Liwei once wrote: "I once overlooked our capital Beijing, during the day it was a gray-white patch of the Yanshan Mountains, indistinguishable, and at night it was a red halo, where there were my comrades-in-arms and relatives... I tried several times to find the Great Wall, but to no avail. “