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Or we could mark the Earth-facing side of the Moon somehow; that would endure over geological time scales. Maybe not via massive excavations with nuclear charges (sounds like vandalism to me), but, say, hundreds of kilometers long figures/patterns made with aluminium foil sheets hung on poles, or just spread on the regolith (so - easily removable).

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"Dad, what is that symbol on the moon?"

"Our historians say it is the genitalia of a species who lived in ancient times."

;)

No matter how explicit you’d draw the thing, I bet they’d interpret it as „a ritualistic symbol“ :)

"Fertility symbol" :)

Of course. :)

If you just disturb the regolith in patterns, would that be visible? Then all we'd need is a few million roombas.

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