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this post was submitted on 22 Jun 2023
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Why not the Great Wall of china? Like not the exact Great Wall of China but a duplicate of it that is one to one scale. It would be clearly visible when people are looking at Mars with relatively strong telescopes so we would know it was there long before we were there
The great wall isn't visible from Earth orbit. That is a lie that's spread by, well, a lot of people for various reasons.
It would still be something to see if it was on Mars, but you'd have to see it from the surface or with a very powerful orbital telescope.