|
|
|
|
|
|
by xenadu02
1625 days ago
|
|
|
We can be reasonably certain there were no such civilizations on Earth prior to modern human history, otherwise we'd see evidence in the archeological record or even fossil record. I don't mean finding silicon chips in a fossil or anything so advanced. I mean very simple things like ceramic chips or bits of worked glass that would survive for millions of years. The only way a civilization at least as advanced as bronze-age humans existed 100k+ years ago is if it was visitors from a parent civilization on another world that died out. That's the only way you get advanced technology on a small enough scale that we wouldn't be able to find any clues because the clues would be localized to a tiny area we just haven't stumbled across yet (to be clear I don't think any such civilization ever existed). |
|
|
The Earth may (I think it likely) have been tectonically active for long enough to destroy any such traces of an advanced civilization arising during its first couple eons (oldest macro-fossil: 800m years; Earth: 4.5b years).
Better disproof is perhaps the absence of evidence in the geologic/atmospheric record. One imagines that a geologist in the deep future could detect a long-forgotten humanity via the record's abrupt spike in CO2 output, just as present geologists know of the Great Oxidation Event.