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Time is a circle
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this post was submitted on 07 Nov 2024
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They're physically possible, just massive engineering challenges. Read Orion's Arm's overview, it's largely based on current known physics.
For space elevators, to the best of my knowledge, there is no known material that can withstand the forces involved. Not even CFNTs.
For wormholes, we're getting so deep into speculation that the conversation doesn't even really matter.