On a more serious side note, rifts in space-time are extremely hypothetical and could be caused by black holes (probably not, but honestly no one has any idea what goes on in there),
infinitely long spinning cylinders (yes, someone did the math for this and you could fly in specific patterns around it and go forward/backwards in time), and wormholes (also highly hypothetical and would probably require tons of repulsive/stabilizing energy to keep it open) @Kuroi pls convince em I'm not insane
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