I dont know.....But one really interesting thing that always comes to mind when we talk about this stuff is:
In a painting by leonardo davinci he has a scene of a small city with people shopping, and boats sailing in the water and small houses and apple stands and fish stuff...But what really is interesting is that in the painting there is a small silver saucer in the sky. And there are a few people in the painting looking up at it and pointing to it.
This was painted by davinci who as we know was long before our time and the whole aliens thing.
Question is why does he paint that silver ufo and why are people looking and pointing at it if we have never been visited by aliens?
PS- when most people see lights at night and ufo type objects it is remote control helicopters. We used to attach the glow sticks, or lights to our RC compters and fly them at night in unison or on our own effing with people making them think they were UFOs or stuff. We would hover, take off fast, back up, whatever we wanted...Sooooo funny.