in back to the future, ya know when the car has to go 60mph in order to go into a future dimension. ok, that makes sense, but what i don't understand is how the car can still be going 60mph when it reaches the other dimension. theoretically, the car should be at 0mph once it enters the future world, so it would just do a massive burnout instead of truckin along at 60mph. these are the thoughts that keep me up at night.
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well a wormhole is just a shortcut through the fabric of space-time from one place to another. it can be from the past to the future, or between two places in space. you'd be effectively still travelling forward even while going through the wormhole. it's the equivalent of folding a sheet of paper and drawing a line from one point to another when normally the line would need to be much longer. you still keep your pen moving, even though you take a different path. I think that you are thinking of wormholes as sometimes portrayed by science fiction and not current theoretical physics wormholes.