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Comment by 8bitsrule | Hacker News Reader

Enormous piles of very skillfully worked massive stone blocks. Artifacts made of common, long-lived matter so precisely crafted that we could barely duplicate them today.

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You mean like pyramids? Heh look at what few thousands of years caused to them, and its not even very challenging environment (very low humidity, mostly sand abrasion). In fact, go to mountains and actually try to look around a bit from geological perspective - they are constantly being weathered, all types of rock, by mostly rain and elements. Elements cut through stone like through butter.

Just because something doesn't visibly keep disappearing in front of your eyes doesn't mean its some ultra stable form to last for a billion years.

Also, one proper earthquake and your fine stone structure is a big pile of rubble. Now do it 100x.

From a geological perspective, several types of rock will last more than long enough. Maybe you're thinking too long-term, heh.

During the last 2.6M years - and man's been around -at least- that long - there've been a dozen or two ice-ages. Between them were interglacials, some of which lasted 2 or 3 times longer than our 10,000-year holocene. More than enough time and resources for an earlier (even wiser or saner) humanity. Or three.

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).

"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“ :)

Of course. :)

"Fertility symbol" :)

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

Stone blocks will be quarried, weathered, ground by glaciers and then subducted beneath the crust. Small artifacts disappear even faster and are harder to find.

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