Well, it's been about a month since my last visit.

Thank you, ER. I do get what you write, but alien just don't quite cut it for me. At all, and for a different reason.

There is absolutely NO concrete evidence of extraterrestrial visitations to terra at all, ever since time began. None. As well, absolutely no evidence for other life existing, advanced or otherwise, anywhere in the entire Universe. These being facts, that would have to leave terrestrial, be it a human-engineered product or some as yet to be exposed natural phenomenon (spooky action close-up) to be the only plausible answers. Alien sightings have been reported ever since Aurora, Colorado (c. 1897), with no solid evidence left behind, ever (very clean alien invaders -- Vulcans?).

Reactions of sighted craft are abrupt, very polaristic (often mirroring maneuvers of an observer's craft), and include the phenomenon of vanishing from physical sight. It all looks very spooky, very quantum.

There is always the possibility of an alien theme for these visitations, but not very likely. The polarity of these objects seems to create a distance barrier. We get too close, and then it either takes off at incredible velocity or vanishes from sight. Does that mean our approach forces the closing of some interstellar/trans-temporal doorway? We don't know. If this is an incredibly advanced technology, how are we able to sneak up on them so often with big, noisy jets?

Quantum entanglements with the properties of dark energy and dark matter?

Nature does strange things, often more bizarre than anything of which humanity is capable. We have no idea what any of this is, but I find it all self-demanding for research.