Asked by: Chris Tuttle, Edinburgh
No. Even from low Earth orbit the Great Wall of China is extremely hard to spot with the naked eye. It’s a very thin line, almost the same colour as the landscape. Lots of other things are visible though, including cities, airports and dams. From the Moon, no man-made structure is visible.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.
