According to Xinhua News Agency Beihai165438+1October 23rd, the legend that "astronauts can see the Great Wall in space" was explicitly denied by space hero Yang Liwei. A few days ago, the reporter accidentally saw this sentence in the widely used primary school Chinese textbook. Perhaps this is one of the sources of its widespread circulation.
This sentence was published in Lesson 20, Volume 7, Grade 4, Chinese, a textbook for grade 6 primary school, entitled Bricks of the Great Wall. The author of this essay is Liu Houming.
Can you see the Great Wall in space?
American astronauts can see with the naked eye.
"You can see the Great Wall with naked eyes in space," recalls Jean Cernan, an American astronaut who landed on the moon in 1972. When he went to Singapore last month, he told the Straits Times reporter: "You can really see the Great Wall of Wan Li, China with the naked eye on the orbit from 0/60 km to 320 km from the Earth/KLOC-."
Cernan said: "Whether you can see the Great Wall depends on your eyesight. You should know where to look." He also said that he could even see Singapore from outer space. But the fact is, due to its small size, even on many maps, Singapore can't be seen clearly from space.
Yang Liwei and other experts denied it.
Last year, China's first astronaut, Yang Liwei, overturned the long-held view that the Great Wall of Wan Li in China could be seen from space. In June+10 last year, Yang Liwei, who returned to the ground, said in an interview that the scenery of the earth was very beautiful from space, but he didn't see the Great Wall.
Some experts pointed out that although the Great Wall stretches for tens of thousands of miles, its average width is only 10 meter, and it is narrow and irregular. For a spacecraft flying at a height of 300 kilometers, only buildings with a width of 500 meters can be seen, and the Great Wall with a width of 10 meters is obviously not up to standard.
NASA also wrote on its official website that many man-made projects on earth can be seen from space without other magnifying tools, but the Great Wall is not one of them. (According to Xinhua News Agency)