Time, Infinity and the Universe

[namooP]

Ok, bare with me on this one. I know a lot of its bullshit and the rest is a patchwork of the most basic understanding of some complex theories, but it was fun to think about.

I couldnt sleep last night, and I got to thinking about the universe, and the fact that it has limits, since it started from a point and got bigger. Then I figured, if the universe isnt infinite, then nothing that physically exists inside it can be (on a side note, I figured that the only this that exists in infinity is nothingness, which only exists outside the universe). But because time can be manipulated (by speed and gravity), it exists in the universe, so cant be infinite.
I was pretty pleased with my self after this, but it kinda fell down on analysis.

Of course time isnt infinite, it only existed since (duh) the beginning to time (big bang) until now, and it will continue expanding with the expansion of the universe forever. Looks like my theory fell to shit. Oh well.

Still couldnt sleep though, so I kept going. I remembered the idea that the universe might eventually start to collapse in on itself. Heres where it got interesting. If time progresses forwards as the universe expands, wouldnt it rewind as the universe collapses?

(Another important side note. We can never tell if time is flowing backwards or forwards. Because we only ever exist for an instant at a time, everything would seem normal for that instant, until we regressed another instant and everything would seem normal then. Give me a break, this is hard to explain.)

That was pretty interesting, but I ran with it. Lets start at the start. Theres the Big Bang, the universe expands, Earth forms and cools, youre born, you die, the universe continues to expand until it begins to collapse. Then everything rewinds. Your death, your birth, earth forms and cools, the universe shrinks back into it pre-Big Band singularity.

But what then? Youre at year dot. Second dot. Instant dot....... and it explodes again. The Big Bang, the universe expands, Earth forms and cools, youre born, you die, the universe continues to expand........ until it begins to collapse.
Because time rewound to the big bang, everything will be EXACTLY the same as it was before our big bang. So everything should progress the exact same way it did this time. And that should happen the next time, and the next time and the next time............

Which leads to questions about fate, choice and reality that I havent worked out yet.

Comments?