Why Aliens Have Never Visited Earth (that we know of)
New Theory based on the Fermi Paradox: The contradiction between the immense age of the universe and the lack of evidence that extraterrestrials exist.
Personally, I have never seen a UFO let alone an alien; however, given the jaw dropping size of our galaxy, I do not discount the existence of aliens and whatever form they may take, it does not necessarily have to be anything that we are familiar with on earth.
I imagine that any aliens that would be capable of inter-galactic travel would probably have managed the creation of an energy source that is beyond our imagination and comprehension.
There is the possibility that alien life is already present on earth and may be so inconspicuous we do not even know of it’s existence .Humans were not even aware mites were living and reproducing at prodigious rates on their own faces until 1841.
Good point .A life form literally right under our nose undetected and unnoticed coexisting with us through out our evolutionary history.
I think about that sometimes. A worm crawling on the ground has absolutely no idea that we exist. It is possible that some other life form exists in the same space, or a different dimension of the same space.
When alien existence is pondered it is usually based on life that is only recognizable from a narrowly limited human frame of reference.Life may exist that is so removed and diverse from our perspective that it does not in any way conform to or require any parameters we could possibly imagine for its existence .Also with the theoretical possibility of the existence of Bubble universes (multiverse) that may each be comprised of a different law of physics this further opens up the possibilities of life forms so infinitely remote from ours it is not even fathomable .
That's exact;ly what I was thinking, but you put it well!
I've had a big problem with the Fermi Paradox for a long time, even the "conservatives" assume that we can build a compact, efficient fusion reactor that can operate for decades at a minimum. I think fusion is likely but it will be optimized for deuterium/ tritium (the easiest route) and like other large power sources will be large stationary plants with limited service lives. Interstellar travel will always be so slow, difficult and resource expensive that anything beyond limited research probes will never be worthwhile.
@Garban If they've ever watched any of our science fiction movies they would see that we're not necessarily alien-friendly, and just ignore us as the insane asylum of the universe.