I think the aliens came, saw and left!
The more time I spend around certain individuals from certain places, the more I believe in ancient aliens.
There is no way these people could have ever figured out how to stack blocks to make those pyramids in a certain Central American area.
Do the labor, yes. But put two and two together to design it, no.
That’s what I think too.
Look at it this way. There are billions and billions of planets that can hold life by the Drake equation. (not that that is the be-all, end-all of the discussion, but its a good starting point for my purposes)
But even billions is a tiny fraction when you take an almost infinite universe/ divided by billions.
Compare that to the Erf.
A comparable tiny fraction of the earth would be minuscule. But let’s say it’s one square meter.
If you zoom in on one square meter of the earth from space most of the time it will be empty. The top of Mount Everest is almost always empty. The middle of the ocean, etc etc.
But we have gone to the top of Mt Everest and will will go there again.
It’s like that. There may be places in the universe teaming with life and we’re on the fringe.
Aliens might have been to this tiny fraction of the universe and could be back. I think there is ample evidence of it, and the 10,000 years or so we know about is nothing compared to the millions of years this planets has been here.
Erosion takes a huge toll. If you look at places that we KNOW once had thriving civilizations we have to sift through dirt to find traces. Civilizations from millions of years ago would be harder.
But we have found iron pots embedded in coal. metal pieces have been found in rocks millions of years old.