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Originally Posted by Bring_Back_Shantz
Well that's not really debunking back to the future, it's just debunking time travel in general. I was really hoping for something back to the future specific.
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There are multiple means of travelling through time. Time Travel through Time Displacement is the most fantastic and is what is demonstrated through movies like Back to the Future, Terminator, Star Trek etc. One could also theoretically travel through time by means of physics, through wormholes or singularities (provided they survive the experience), or by simply beingplaced in a state of hibernation and woken up years later. The latter is technically possible, but not true time travel in the essence of the term.
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That being said (and I can't believe I'm about to do this), you haven't debunked back to the future. The whole point of the movies is that changing things in the past crates a new timeline, meaning that no one knows that anything has been changed from the point of view of the time traveler, meaning evidence of the time traveler does not exist, or exaclty the opposite of what you're saying. How would I know if someone went back in time and changed it so that Napolean lost at Waterloo?
Besides, like the axiom goes "Absence of evidence, does not equate to evidence of absence".
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Doc and Marty were not the only ones aware that something had changed. Older Biff became aware, and it was his discovery that brought the whole changing-the-past dynamic into a crucial problem that made the crux of the second film. Fact is, evidence that time travel was possible existed, and was evident in objects like the DeLorean itself, which had to be concealed when in the past, and The Sports Almanac. Older Biff's idea of taking the Sports Almanac from the future and giving it to his younger self -- though originally Marty's idea -- is evidence of Humanity's flawed nature just as much as it is an ingenious idea from the perspective of personal financial gain via knowledge of the future's outcome. It is inconceivable to think that if time travel were real and possible, that someone somewhere would not have used it -- and their knowledge of the future -- to their own selfish ends.