Things like alien contact fasciante me, though i have my problems with the faster-than-light travel virtually required for that to happen at all.
Well, like what I said earlier, the 5th dimension would get around this without actually breaking the speed barrier. Rather than moving, they would be somewhat teleporting. This is where quantum physics comes into its weirdness.
Perhaps there is something we don't understand yet that could make it a reality, like creating artifical wormholes between points in space as we see fit. These would require the existence of an additional dimension, but that is something very difficult to (dis)prove.
I think it will become a necessity to challenge this hypothesis in the future, as much of our technology and science will depend on it.
It could also involve something like time travel which would be even weirder, but i don't want to exclude things just because they seem weird or counterintuitive - in all honestly i find our current knowledge of quantum mechanics confusing sometimes already.
Technically this is what we would be doing by 'teleporting' to one point to another, as the 5th is another temporal dimension. Although without the so called 'travel'
Personally i do not believe aliens have visited earth at the moment, but i don't exclude that they might at some point in, well, time. Just that statement would make the time travel hypothesis problematic, since they could pop up yesterday and i would not be aware of that in the current timeline
This no one can say for definite, but I do get an eerie feeling that we they may of done. I also like the thought of hiding in plain sight. Humans are amazingly blind when distracted.
I propose we be scientific about it all and just collect data, both personal observations and from camera's, sensors and such.
To some degree we should be glad for the lack of alien contact i presume. There is a realsitic chance that aliens would see us humans as a good source of burger meat than as conversation partners, like we do cows