No reply button for you. I think after nesting replies more than 5 times it disappears.

Yes, multi-verse theory. Except that in contrast to the idea that the universe simply exists in a bubble that is adjacent to other bubbles with their own universe inside them, the future would simply be a combination of all of those universes existing on top of one another, and is funneled down to one determined outcome when that present moment arrives to make it happen before it becomes a permanent fixture in what would be called the past. This is partly why I don't think time travel can ever be possible if reality is constructed this way. The past is the past - it can't be changed. It's in stone, essentially. And the future - well...if the future contains all possible outcomes, where are you going to travel to? Any future you go to, you can't really say anything about it when you come back to the present to tell anyone because there's no guarantee that where you went is going to be where we actually end up. In fact, the simple fact that you traveled to the future could be what determines which future you arrive at. So it's fruitless.