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It must be close to 100 years now since people apparently started seeing, photographing and reporting UFO sightings. Yet in all this time we still have no firm proof of their existence. I personally find it very hard to believe in them.
Don't get me wrong, I'm not saying that we are the only inhabited planet in all of space. When you think that you could take all of our universe and scale it down to the size of a pin head, and yet still it would be surrounded by infinite space filled with infinite galaxies, then it makes it difficult to suppose that we are the only ones here.
No, it's not the existence of other beings that I doubt, it's just whether or not they have visited us that I question. I try thinking of it the other way around. If we had the capability of traveling vast distances to other worlds, then when we got there we discovered they were less advanced than us, would we spend 100 years just zipping to and fro in their air space every now and then. I think not. I think we would land in their equivalent of Central Park and announce ourselves. Yet some people obviously believe that aliens have been stealthily creeping around our skies for that long. Perhaps they're vastly intelligent but extremely shy & timid.
There's also the distance factor to consider. Our nearest stellar system is Alpha Centauri. It's 4.35 light years away. So if you lived in that system and could travel at the speed of light, it would take you 4.35 years just to get here. And for what? To shadow a Cessna across the Pacific then head home again. "See you guys, just popping over to Earth. Be back in 9 years, provided my lightdrive doesn't play up."
On top of that, we're pretty sure there's no advance life in that system anyway, so the surreptitious aliens would have to have come from much further away than 4.35 ly. Way too far for a joy ride. Face it, we have not been visited & there is a very good chance we never will be.
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