Why would any self respecting alien come to this obscure planet in this obscure solar system in this obscure galaxy when there are so many others to go to?
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Because they never left? Consider our known history’s origins are very murky. Where did the Sumerians learn to count base 60? And so many more unknown origins of basic things. Not to mention all the cities and structures drowned under 100s of feet of sea water.
What if there were many prior Earthly civilizations whose ‘tech’ we cannot recognize as such left due to impending catastrophes, like the one which caused real climate change from 10600-9600BC wiping out all of the mega-fauna and burning off 4% of the Earth’s vegetation?
If we knew of some inevitable meteor or comet strike which would cause an ELE in 100 years for instance, would not every effort be made to flee the Earth before the disaster?
So saying these ‘craft’ are aliens may be a stretch too far, as it make more sense they are our ancestors gone to space (the Heavens).
What if there were many prior Earthly civilizations whose ‘tech’...
***The battle of the ‘what ifs’. What if there WEREN’T prior civilizations with the technology to fly? That seems far, far more likely, given the archaeological evidence.
If we knew of some inevitable meteor or comet strike...
***Uhh, we’d knock it off its course. Duhh. A civilization that could send its elite to the stars would have enough technology to deflect a meteor.