First off, no person can really know when the end times will come. If I remember correctly, it's a sin to even try and guess it. I remember a friend saying that that's a dumb rule, but then you have that one weird evangelist years back essentially scaring people to the point where they sell their houses and all that because something about him using MATH in Exodus and predicting the end times? MATH in the Bible. As a Catholic, ya' don't do that. It also prevents people like the Pope or Priests from pulling stunts like that.
Second, while I really don't know what's going on... I think the obvious would be the government testing technology on their own men? At least, that's MY guess. But seriously, don't underestimate the Military Industrial Complex. Our country is currently making a space laser.... A SPACE... LASER. We've essentially made Regan's Death Star Program into a REALITY. China plans on making their own "Captain Americas" while also making a statement that they will begin cloning. They also went straight up Suicide Squad and said, no joke, "We'll be putting bombs in our soldiers' helmets so they can comply".
Also... OUR ROBOTS CAN DO THIS NOW.
We also have cloaking technology btw using mirrors in air crafts (China specifically). If I'm not mistaken, the most recent "space ship" happened after China's balloons were shot down. HmmmmmmmmmmMMMMMMMMMMMMM.
Then again, I do remember watching a historical account following UFO reports before the 1800's in different countries so what do I know.
All we can do now is keep an open mind that maybe there CAN be aliens while also being skeptical about whatever weird project the Government has cooking I dunno. I can say with confidence that the Bible says nothing about little green men though.