I mean, currently both space elevators and wormholes (as transportation) seem physically impossible.
If we’re not sticking to the realm of our current understanding of physics, then that opens the doors for techbros too, because we’re in the realm of speculative fiction and things can be however we say they are.
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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.
