Who hasn't heard of people claiming to have been abducted by aliens who then had terrible things done to them? Or how they were abducted by aliens who are secretly studying us to see if we are worthy of true knowledge?
Yet, has any of us heard of any proof -- independently verifiabe evidence -- that the aliens in fact were extraterrestrial aliens?
Consider that during Columbus's fourth voyage to the New World he and crew came ashore on what is now Jamaica. They were in desperate need of supplies.
Columbus told the inland's inhabitants that he would on a very particular day make the moon disappear thereby showing the locals that if they did not give Columbus the supplies he needed he had the power to make the sun go away.
Sure enough, on the appointed day the moon was eclipsed and the locals gave Columbus whatever supplies he needed.
Why don't the aliens give the abductees independently verifiable proof of their
extraterrestrial origins and possession of advanced knowledge?
I say we should prepare people for the next abduction. You known, come up with a few questions for the aliens, a few pointed demands that they give us some real reason to believe they are from another planet in another solar system.
Now, they will have to tell us something that we don't already know, and it will have to be something that we can independently verify in a reasonable period of time -- something that is an extrapolation of knowledge we already possess but have not yet developed into that particluar insight into Nature.
Something like the exact mass and diameter of the largest Kuiper Belt object.
What should we ask the aliens that would prove they are space travelers possessing more advanced knowledge than us Earthers?