The Great Wall of China is not visible from space

One of the most persistent myths claims the Great Wall of China is the only human-made structure visible from space or low Earth orbit. This widely repeated claim has been definitively disproven. Astronauts in low Earth orbit have repeatedly stated they cannot see the Great Wall without optical aid. The fundamental issue is scale: the Great Wall's width ranges 15-30 feet, too small for angular subtense resolution from orbital altitude. Satellite imagery confirms the Great Wall blends seamlessly with surrounding terrain, mountains, and vegetation. Many other human structures are visible from space including major cities, highways, airports, and dams, but not the Great Wall due to narrow width and color similarity to landscape. This myth persists because it reinforces human achievement narrative and because people conflate aircraft visibility with space visibility.