Footprints On Moon
I was just thinking that when they do go back to the Moon, they're going to have to, at some stage, figure out a way of preserving the footprints of the Apollo Program astronauts from being trampled on and erased by future explorers.
Considering that the landing sites are historical monuments, I think the best way to preserve them would be to put domes up over them and have cameras on rails, so you could move them into position above the footprints and the spent landing modules. Have interactive displays in kiosks outside the dome so you could look at the sites.
Either that, or fence them off and do something similar with cameras on cables etc.
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