CAUTION: There are so many unanswered questions. Let's be polite, patient when mixing science & spirituality. Let's be truth seekers not concluders when we don't have enough data to conclude, LOL! Hence our Sanatan values tell theists, atheists, agnostics to be tolerant to eachother.
> From scientific PoV, Drake equation, etc, there are definitely E.T. but 1st few questions - how they can get here, in how much shortest time, what technology, etc.
> There are more than 1 million documented species & many yet to be documented. But only us humans have so much intelligence, 1 out of 1 million, i can't digest this. In my belief we are definitely created or rehabilitated.
> Since milleniums, our Puranic culture already mentions Vimans, Asurs, Loks (realms or planets), etc. Earth is called Bhu-Lok/Dharti-Lok, Moon is called Chandr-Lok, Mars is called Mangal-Lok, etc. The Purans mention at least 7 higher or better Loks/realms/planets & 7 lower or worse Loks/realms/planets, Earth is in middle. So Heaven is actually far better planet like Utopia imagined & Hell is/are far worse planet(s). So there could be multiple heavens & hells.
The movie series of Marvel, DC comics, Star Wars, Star Trek, etc are just modern recreations with excellent animation making things more believable. They earn lots of money from it but disrespect our Puranic culture.
> But there are many foreigners also who have studied & respected our culture like Carl Sagan, etc.
> Like we see in fiction movies- in far future if we found a planet to populate somehow then we may want to observe the live species naturally over time. Our tech would always be far ahead so even if they evolved & developed WMD, we could counter them any time.
> I don't think Area-51 has any UFOs bcoz the E.T.s can retake it any time. An advanced race would send a big mothership & then scout ships down. They could have their own version of AI, robots, etc & program their space-craft for self-destruction in case of emergency.
> As per our culture why our gods & godesses are not interfering when so many innocents are dying due to hunger, desease, war, etc? Bcoz all this has may have happened like a cycle many times. Intelligence comes with responsibility, it all depends on our upbringing. As per Sanatan values 95% of human population is misbehaving & everytime we fail to comply. Earth is not the only planet, so the E.T.s for gods are just another species, it doesn't matter to them whether humans kill eachother, humans kill other animal species or humans Vs ETs.
> Some ETs could be living among us, avoiding X-ray, MRI machines, medical checkups. The easy & only way perhaps is to live rural/remote/isolated/renunciated kind of life.