Everyone says the Great Wall of China is the only man-made object visible from space. Astronauts disagree.
What you'll learn:
- The wall stretches over 21,000 kilometers — yet from orbit it nearly disappears.
- NASA says it's not visible from the Moon and nearly impossible to spot from low Earth orbit without a powerful lens: it's only 6 meters wide and built from local stone, so it melts into the landscape.
- China's first astronaut Yang Liwei looked for it in 2003 and couldn't find it; Chris Hadfield said it's too thin, its color like the dirt.
- The things that ARE easy to see from orbit: city lights, highways, airports. Contrast beats size.
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