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  • $\begingroup$ How would underdeveloped civilization be an awe of something they cannot see? $\endgroup$ Commented Nov 1, 2016 at 15:43
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    $\begingroup$ @MatthieuM. Can they see the moon? Yes. Build a structure big enough to be seen from Earth. Give it power, and lots of lights. Nuclear fuel could last millennia if done right. In fact, it wouldn't be that hard seeing as how Terrestrial lights are visible from space and we aren't even trying that hard to do it. With a structure on the moon, it could easily be an intentional beacon or depending on the timeframe... a spatial lighthouse. $\endgroup$ Commented Nov 1, 2016 at 18:21
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    $\begingroup$ If you built the "Great Wall Of Luna", it would be large enough to be seen from earth. Very high structures would also be easy to build, and would glint at local dawn/dusk, being highly visible from earth to anyone looking near the lunar terminator. A magnetic launch accelerator track might be such a structure. $\endgroup$ Commented Nov 2, 2016 at 10:33
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    $\begingroup$ @pjc50 The visibility of the "Great Wall of Luna" would depend on how big you build it. It would have to be many, many times larger (think many tens of miles wide if on the Moon) compared to the Great Wall of China, which contrary to the popular belief of humans who have never been to space, is not visible to the naked eye from space. $\endgroup$ Commented Nov 2, 2016 at 17:07
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    $\begingroup$ No artificial structure on Earth is visible from the moon, or vice versa. snopes.com/science/greatwall.asp $\endgroup$ Commented Nov 3, 2016 at 21:18