Titanium: Hold on there, this is now a fact? It was said by one guy that was raising money for his theoretical time machine, and gave no proof whatsoever.
Ummm.. Sure it's true ! Just give me a lot of money so I can build the time machine ASAP :3.
Titanium: The only reason that you can't go back into the past, if you
had a "working" time machine, is that you could create a time paradox
This is a really narrowed down argument that suggests that as long as you DON'T create a paradox, things would be fine.
They wouldn't. If the past is truly THE past, that means you've already been there. The chronological order wouldn't match the subjective one. What's more - if you moved into a time where YOU already existed - WHO the hell would be "you" ? Two minds, two bodies, same person ? You could build an army o "yous".
What about free will ? If you travel to the past - why the hell SHOULD people make the same decisions ? Is the world truly a big clockwork machine ? Even if so - EVERY change, even the smallest, sends ripples through the entire world.
It's nonsense.
Titanium: In that way, your "future" would not exist, or making an alternate universe.
I always sounded so megalomaniac to me, to think that we can MAKE an entire UNIVERSE by simply doing something. Wouldn't it be simpler to "just" assume that there exists an infinety number of alternative universes ? For example - "stillshots" of EVERYTHING at a moment. This would mean that we are, in fact, going through all these stillshots and "time" is a name we give to travelling between these worlds, i.e.: "change".