If that happens, that civilization will be so far away and subject to the physical laws that we are bound by that communication and contact will be nearly impossible.
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All of that verbiage assumes we now know all of the laws of physics and that there is no set of knowledge which supersedes what we call science.
The truth of the matter simply requires forgetting who influenced Einstein, and who and what Tesla was trying to achieve. The rewriting of 4 or 200 ‘quaternions’ formulated by James Clerk Maxwell by the self-educated, momma’s boy Oliver Heaviside, from the original field equations (because “field equations are abominations”) into vector equations, resulted in giving us all we know of the electromagnetic spectrum.
The original field equations (’quaternions’) postulated a totally different Universe that the one we now pursue - one attributes claimed is the nullification of distance, making far away peoples next door neighbors.
All ya got to do is prove it…make antigravity, open a door to the multiverse, anything that shows other dimensions or other aspects to physics that we don’t already know.
Then study those quaternions and come out with the mathematical proof yourself. Easy peasy, done deal, right?