Well we are in a conversation entertaining the theory of humans having alien corpses as is the point of the article
We can assume hypothetically we are at a stage where they exist. If we assume they don’t then your point that they appear to humanoid holds no further argument. That they would be here on earth would means either one of two things. They have the tech to travel huge distances or they have where already here.
There allot of ideas of how alien live could look and how a cross species encounter would look like. One that regularly pops up is that a species capable of traveling beyond the speed of light will also be advanced enough to create bio engineered bodies.
If aliens suddenly appear on earth the chance that they would be a bioengineered body build part with earth/human dna so to be able to breath and move on our planet while controlled from a safe distance is not much more far fetched then the premises that aliens exist and are on earth under any other scenario.
Uap are being studied by scientists all over the world. Its not limited to what the US talks about. The fact is that they are unknown phenomenon till they are not. There is no proven conclusion in any direction.
That is just a lot of conjecture regarding what aliens can or cannot do. It is parsimonious to assume that each leap in technology is extremely hard, as it is for us.
Spaceflight is something humans can do to some extent and it is not too far fetched that humans could build stuff like generation ships within few generations if we put our minds to it. There is currently no known or proven way to do faster than light travel and it is highly likely that it is impossible from our current understanding of physics. So why do we assume aliens can break physics just by existing?
Same goes for biology and changing your body shape via genetics or creating complex life. We can’t do it and it does not seem like it will be possible, especially to an extent that would be necessary for this scenario. And even if possible, why? Why change into some weird body instead of the one you adapted to use and augment that with technology which is certainly possible, even humans can do that to an extent that allows us to survive in almost any environment.
The most likely thing by far would be alien generation ships or extremely long lived species with somewhat more advanced space travel and other technology. Anything else is basically science fiction/magic without basis in actual science. So why would we assume that aliens do all of that by merit of being aliens? Expecting omnipotent visitors is usually the domain of religion.
This applies to UAPs as well. As long as you can think of any explanation , no matter how contrived, based in our current understanding of physics it is extremely preferable to physics breaking aliens.
I would disagree on the creating complex life. Science has shown very capable but is limited by law as genetic engineering is quite controversial.
I simply find the idea that some exotic far more advanced life has figured out how to build biological remote controlled drones designed to function in their work environment while they themselves stay home sounds more plausible then a huge nomad ship that works entire generations to get somewhere. The first sounds like an eventual phase of any advanced society i can think off. The second sounds like space refugees in a dire situation.
Theres no way to break physics, you can only understand them well enough to apply them in seemingly magical ways.
Genetic engineering can do a lot. However, all laws be damned (which they almost are for many non vertebrate life forms) we are nowhere near creating anything resembling biological drones, or even sure that it’s possible to a useful extent. Also why use biological drones for a long journey instead of mechanical ones that are well suited to long hibernations and high radios environments? Also they can do stuff like send radio signals or take photos which would be useful for exploration. Same as physics, why do aliens get a free pass on what is basically biology magic?
Regarding physics, we have a very good and extensive understanding of the laws of physics. Thermodynamics and other rules of motion, speed and energy are very well studied and I don’t think there have been big surprises in a long time. So if aliens are doing what people are claiming the UAPs are doing, they are clearly breaking the laws of physics as we know them, so other explanations are most likely to be true (see the video linked in my other comment).
Saying stuff like “advanced physics is indistinguishable from magic” may be true if we’re talking about the knowledge of the average person and special little magic tricks (superconductors levitating magnets for example), but dismissing fundamental principles like that is just handwaving away any basis of our current understanding of reality and opening the door to wishful thinking and alien magic.
