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I guess plastics would still be around. So they would know we wrapped our food in plastic, but not that we flew all over the globe and went to other planets (unless they found a needle in a haystack and stumbled across pathfinder or something).
Kinda funny if someone responded to the Voyager plaque, only to get here and find nobody's home.
Good point about the geostationary satellites though.
I guess I'm thinking what would be apparent to a cursory glance rather than things like ground penetrating radar. I don't think we've even gotten to that point on Mars yet, have we?
I thought that was interesting about the pyramids. I hadn't heard that, but when I went to look it up, it seemed that perhaps that was not the case after all. The Sphinx used to buried up to the shoulders, but apparently not not the pyramids? The pyramids are not in an excavation pit and they couldn't have removed a layer of sand 140m deep over the entire Gaza plateau so it seems probably not. But it wouldn't surprise me if they are degrading with acidification of rainwater owing to increased carbon in the atmosphere.
Markus
Cheers
Markus
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