exactly, it isn't "magic", its just something that is so advanced and strange that humans will take centuries to decipherSupernatural explanations are irrational and superstitious by definition. There's a natural, rational, physical explanation for everything. The march of progress is defined by the expanding sphere of our understanding.
its a incomplete theory! to complete it we need to meet the thing itselfWhat's the origin of this "extradimensional ultraterrestrial" that you assume exists? Where does it reside? What's it's physical nature? How long has it been around, and why don't we see evidence of its evolution on Earth within the geological or archaeological records?
as for the last question, its clearly not life as we know it, i doubt it would evolve
yet they somehow radiate heat into nothing-ness, have artificial gravity and a lot of others problems (not going to mention FTL and CE3 problems because you alreday have biased answers to both)In fact it's far harder to try to answer any of those questions, than it is to simply posit that we're being visited by very advanced species that originated in other star systems, which by virtue of their more advanced technology and civilizations, are in some ways perplexing to us.
you are talking about 19nth century science, nowdays academia has only one function: $And only people who don't understand academic science attack it as "corrupt." The adversarial nature of the scientific process and the peer review process serves as the best refereeing mechanism that humans have ever devised