I don't think time travel is possible because the past doesn't exist anymore.
In an old folks home the past is all that matters.
Any system far enough advanced for interstellar travel or time travel could probably solve genetic issues without coming to Earth in recent times. I'm skeptical of most ET claims about their reason for coming here.
I agree, in fact that awful Bruce Willis movie about those aliens that came to earth with that kid who kept leaving glasses of water everywhere... and it turns out the aliens can be killed by water... which makes you wonder why they bothered coming to a planet that is 2/3rds water, to prey on a life form that is 3/4ths water...
I doubt it. Some reported entities are quite humanlike others reptilian or insectoid. I think most aren't naturally evolved but just part of an alien show.
Well if they can travel across galaxies then perhaps we see what they want us to see... who knows what they might actually look like... like that tiny little alien in MIB that drives the human around like a vehicle.
Right as Stent once wrote progress doesn't go on forever but likely stops so another world could be millions of years older but only a few centuries or even decades ahead of us in terms of basic knowledge.
But look at our own history... tens of thousands of years with different technologies being developed and wars destroying cultures... some technologies might have been destroyed because the culture that they were developed within was destroyed.
It is mind boggling to think that within the life span of one human being when they were born... powered heavier than air flight was invented and before they died man lands on the moon, or goes in to space... that is rapid technological progress, which brings communication and information storage capacity that makes even more rapid progress possible.
Before writing things were handed down by word of mouth, now you can look on the internet and a wealth of information... and bullshit.... is available.
The only way we can explain these events, are that human thoughts travel through time.
But then there are 7 billion people on this planet and probably more than half of them dream most nights... some several different dreams per night that they might not remember. Is it subconscious mind reaching out, or is it just random so when someone dreams of something and it happens that is a coincidence.
I had a neighbour who lost her key at the beach, she had been looking for hours and finally raised her head and spoke to god... she had never been a religious person and said she needed the key and she would become Christian if she could find the key. She said she looked down at the ground and there it was. The question is, if she had said a 7th day adventist, or mormon, or jew, or muslim, or really really drunk... would the key have still been there?
I suggest to you that it would.
One of the most common dreams is the feeling of flying, but when you are asleep there is a part of your brain that automatically disconnects itself from your body, so you think you are walking or running or climbing or jumping, or just floating but your body does not move.
I remember waking suddenly from a particularly vivid dream and I was halfway through kicking a ball... that moment of dread when I felt my leg powerfully follow through with the kick and kick the cabinet beside my bed... my big toe split open and it took about three days for the nail to turn black and fall off... damn brain.
Reptilian humanoids could have evolved on many other planets in different star systems & developed highly advanced civilizations Ks & Ms of years ago; some could've visited our Earth.
I think we really need to keep an open mind... just the variety of life on earth is a tiny sample... add different chemical compositions, different air pressures, different gravity levels, different temperature variations... what we see around us is only a tiny fraction of the different life forms that have evolved and lived on just this planet... with a thicker atmosphere more things could fly for instance.