If aliens have visited us through UFOs, the gov would never tell us if they found anything. Too many issues along with it. Religion would especially take a hit, they aren't going to risk messing with that political cash cow

indeed, or humans from a future version of earth in the said alternate reality/ universe. 

The joke here is that even if any government had found anything they would most likely not be the only ones. If there is any kind of proof it would've showed up somewhere out of any government's control. Also, no one would ever be able to keep such a secret over such a long time with so many people involved.

Alien tech designed to do like TVs when they blurry the face to conceive identity... so every single Alien and Alien ship have pre-installed, so any attempt to record then turns up very bad taping.

They don't keep secret, they try to tell us, but we are just to skeptical =p /jk if not obvious.

Aliens are real and they are already here, of course. Please let me explain. An ancient alien civilization that has existed for billions of years and has technology far beyond ours has already spread throughout the entire universe via self replicating drones. These drones monitor developments throughout the universe and report back information, that the aliens can act upon if necessary. These surveillance drones are what the pilots saw. Right now earth is still much too primitive to be of any interest, but at some point a delegation if aliens will arrive to make contact or possibly just destroy the planet outright.

Jeez, that's not an alien... It obviously is an Artificial Intelligent Robot Demon from the twilight zone. Which means it's still from Earth, just from another dimension and possibly from another timeline. Come on people, educate yourselves.

That sounds like something humanity would do.... wouldnt put it past other speices to do the same.

We got to deport those damn illegal aliens

Gotta catch them first...... and when their easily outrunning F-18's....