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Where in space, and how powerful a telescope are you using?

There's an urban legend that you can see the Great Wall of China with the naked eye from the Moon. You can't, not even close. It's difficult bordering on impossible to see it with the naked eye from the International Space Station, which is much much closer to Earth than the Moon is.

What you can see fairly readily if you're as close as the ISS is large straight lines in contrasting colors. The US Interstate Highway system is possible to pick out in places, as are some canals (one astronaut who thought he could see the Great Wall discovered, when he used binoculars, that he was actually seeing an irrigation canal). Large-scale irrigation projects are visible.

From the Moon or further... pretty much bupkis without a telescope.

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14y ago

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