UFO doesn't mean aliens, it means something unidentifiable. Could be millitary craft that is top secret.
But if it was a space ship, then thats cool.
I once saw some strange things going on in the sky. Very fast moving orbs of light that streaked across the sky and then faded away. My attentin was brought to it by a friend who was just gazing into the sky as we were talking about stuff while sitting on a small dam.
From what I have heard about aliens from the numbers things that I have watched and read is this, Reptilian ones come from a system near the constellation Draco, Greys were enslaved by the Reptilians and then genetically engineered by them to be slaves. That is why they are trying to make hybrids because of cloning their dna has become weak and they are unable to reproduce sexually. Then there are the Nordics as mentioned above that look more like blond haired people who are very tall. Supposedly they are nicer. I have also heard that sometimes ones that look like greys are Reptilians in space suits and the dark eyes is to protect from the suns light.
Also, apparently, the greys can not grab things with their hands, and use telepathy to paralyze and control people, and reptilian hands are more like snakes where there isn't really bone definition but more of a muscle thing.
Sounds like an Overactive Imagination. The craziest thing i read was about how to make brain shields to prevent them from paralyzing you. Pretty funny.