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I mean, I get where you are coming from, but the main objection to interstellar travel isn't energy (you could do it with Voyager 1 amounts of energy) it's just time. Which humans have very anthropocentric ideas about that may not generalize to any other entities out there.
Most of the barriers on interstellar travel are barriers on human interstellar travel, that vanish if you have a relatively long time horizon and are fine sending GPT as your ambassador instead of a human. We could almost certainly send a (very small) spacecraft to another star in my lifetime via a starwisp if we really wanted to (and maybe we will!) Relatively fast nuclear-powered travel is also theoretically possible (it should be within the laws of physics, but obviously that's a huge engineering challenge!)
With slightly more advanced technology than we have now, it should be possible to send some sort of a small constructor (not grey goo, or anything crazy like that) that could construct larger devices. Iterate to even more advanced technology, and it could even construct lifeforms ("biologics") in artificial wombs, or, even if not from scratch, from frozen embryos.
Thus you could have a situation where there are little green/grey men crashing spaceships in New Mexico like all the most far-out theories claim without breaking any physical laws, or really any novel technology that humans haven't already considered and mathematically sketched out since the early Cold War.
Frankly, I think the weird reported behavior of some of the objects (e.g. instantaneous acceleration) is much more of a problem from a physics/materialist view in my mind than the problem of interstellar travel. And of course ironically is that we have much better reasons to believe there is something out there engaging in eye-wateringly fast acceleration within Earth's atmosphere than we do that it came here from Over There. So while I'm sympathetic to the "it makes more sense for it to be supernatural" approach, I really don't think interstellar travel is the barrier that some seem to think it is. It's just that interstellar travel might not look like Star Wars.
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