Is the rumor that 'the Great Wall of China can be seen from space' true?



The

Great Wall of China in China is the ruins of a castle wall registered as a World Heritage Site, and the length of the existing artificial wall is said to exceed 6000 km. There is a theory that such a Great Wall can be seen from space, but on the topic of ``Is the Great Wall really visible from space?Are there other buildings that can be seen from space? I'm here.

What human-made structures can be seen from space?
https://www.livescience.com/human-made-structures-seen-from-space

In order to answer the question 'Are there any structures that can be seen from space?', we first need to define what 'space' is. Based on the Carman line , which is set at 100 km above sea level, Live Science discusses space higher than that as outer space.

First of all, the Great Wall is rumored to be visible from space, but unfortunately the Federal Aeronautics and Space Administration (NASA) has officially reported that it is difficult to see the Great Wall with the naked eye from space. In 2005, Mr. Leroy Chao , who was engaged in a long-term mission for half a year as the commander of the International Space Station (ISS), photographed the Great Wall of China with a digital camera equipped with a telephoto lens from the ISS at an altitude of about 400 km. He said he couldn't see it.



Also,

Chris Hadfield, who was the first Canadian to serve as the captain of the International Space Station, also testified, ``The Great Wall cannot be seen with the naked eye from orbit.It is too narrow and is lost in the contours and colors of nature.'' doing. In fact, although the Great Wall is indeed a very long structure, it is only about 10m wide at maximum, so it is impossible to see it with the naked eye from a distance of more than 100km.



On the other hand, there are also many man-made structures that can be seen with the naked eye from space. For example, the Bingham Canyon mine , located about 32 km southwest of Salt Lake City, Utah, USA, is known as the world's largest open-pit copper mine, with a diameter of 4 km. The Bingham Canyon mine can be seen not only from the space station with the naked eye, but also from the space shuttle flying to an altitude of nearly 500 km.


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Also, according to NASA, the Three Gorges Dam built in the middle reaches of the Yangtze River in China can be seen from space . The Three Gorges Dam also has one of the world's largest hydroelectric power facilities, with a levee height of 185m and a length of more than 2km.



The

Palm Jumeirah , an artificial island built in Dubai in the Middle East, can also be seen from Carman Line.



According to Mr. Chao, the pyramids in Egypt were also visible to the naked eye from the ISS. 'I found the Great Pyramids of Giza with a telephoto lens,' Zhao said. 'And even with the naked eye, in good light and weather conditions, I was able to distinguish the two large pyramids as two smaller dots.' told Live Science.



Also, it seems that `` bridges and long roads across the strait '' can be seen from space depending on the light and conditions, especially roads in barren areas such as deserts are easy to confirm. Looking at the image below taken by Mr. Hadfield in space, you can see the straight line of the road on the left.



'Cities can be seen through windows as blobs of gray,' said former NASA astronaut Clayton Anderson . 'My favorite city, Omaha , Nebraska, first appeared as a big blob of gray. His younger sister, Lincoln , appeared as a not-so-large gray blob.'

When Live Science asked, ``What was the most impressive nature seen from space?'' Anderson said, ``It's a difficult question to answer, but the Sahara Desert was my personal favorite. Each time, especially through the lens of the camera, it always gave me a different impression.'



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