Quote:
Originally Posted by DARKMITE8 
So if you travel into the future, future events you see may have happened due to you time travelling to the future, then going back into the past and effecting things, settings things in motion that you have already witnessed in the future? That means the future is already set in stone and cannot be changed.
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Well my theory is this...the future is interpolated from whatever data the universe has at the time you left...and it's not entirely accurate. Like when Marty and Jen went to 2015, Jen snuck in her future house, witnessed Marty being fired, and
playing the guitar badly because he broke his hand. The universe is "guessing" what the future would be like based on what it knows about you
the instant you leave the present and to go to the future (like, it knew Marty would race Needles and get into an accident and break his hand, based on his attitudes at the time...and it knew Needles would try and race Marty and egg him on based on the way Needles is, etc).
Seeing yourself proves you eventually return to the past, but when you do return, you may have seen things in the future you didn't like, start doing things differently. Like Marty refusing to race Needles, and therefore never getting into the accident where he breaks his hand, and so on and so forth.
So the future, if you travel to it, becomes kind of like an incredibly complex illusion, or (Star Trek) holodeck. It's not "real" because it hasn't happened yet. But since you somehow managed to find a way to cheat time and go into the future, the universe has no choice but to show you something.