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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What makes peope think that time is preserved in a way we can 'go back' to it anyway? In the first episode. I've always thought, that when marty sees himself using the car to escape from libyans the marty in the car should be able to see himself on the banking. This would in turn mean that we have no control over our lives and that everything just plays out. Not to mention any time travel into the past would inevitably cause an endless loop. If say you went back and saw yourself, you would endlessly do the same thing. This shows that the future exists now, and is shaped as the present world changes. (yes I love BTTF, Great Film)