To clarify, I didnt mean to sound like everyone making a claim that aliens exist are wrong, mistaken, lying or have alternate motives, just that human behavior will dictate that that is the case for many of them. As you said though, only one of them needs to be right, which is entirely possible.
I also definitely agree that aliens exist in our universe. It almost seems silly not to think that, given the size of the universe. It's also possible that life exists within an older galaxy and that they had more time to evolve then we did and are more advanced.
For me personally though I'm not convinced yet that another life form has visited our planet. Regular space travel just seems implausible to me at the moment given that traveling at the speed of light would still take an alien decades to centuries to reach many of the closer stars within our galaxy. There are some stars that are only 4-5 light years away from us but the chances that life exists on a close planet becomes statistically less probable. Traveling to other galaxies would of course take millions of light years so that's out of the question especially given that our universe is still expanding. We are constantly moving away from other galaxies.
So that leaves other travel methods like worm holes or something else entirely. I like the idea of figuring out a way to dematerialize in one location and then rematerialize in another. If there is a more advanced life form then perhaps they have come up with other methods that we ourselves are decades or centuries away from discovering. That could be possible as well.
I obviously dont have the answers regarding any of this. Not even whether or not they have made contact with our planet. It's a fun topic to ponder though. Maybe you are right and they have not only visited us but have been doing so for as long as their have been humans on the planet. Who knows?
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Understood. I was sort of just saying that regardless as I don't know your total beliefs and didn't necessarily mean to infer such upon you either.
I think thinking about space travel limitations considering what current unclassified known human technology displays is perhaps not the best way and there was a time when many people thought humans would never be able to fly, it wasn't that long ago really in the grand scheme and I think someone or some group of humans may have even already developed technology that is far more advanced. Some say the secret technology is usually like 30-40 years in advance of what the public gets and in some cases maybe it's even much more than that, and maybe some never gets released at all.
All the stuff we see could certainly be human tech or time travelers or something else human caused, though I think it's highly likely we've had visitors from elsewhere already and going back thousands of years if not longer, maybe even millions according to what some ancient traditions and belief systems propose.