Quote:
Originally Posted by KnifeMissile
The idea here is that you cannot create paradoxes by travelling to the past because, by definition, the past has already happened. If you were to travel back in time then you have already done so and we are, thus, already experiencing the consequences of such activity. Consequently, if you had travelled back in time then you will time travel to the past because that has already happened, so obviously nothing will stop you from doing so in the future. A lot of people don't like this theory of time travel because it doesn't allow people to change things using time travel but I think it's a really cool idea and, perhaps more importantly, makes the most sense of any time travelling theory I have ever seen...
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One speculation that I find interesting and strange is that when you go back in time an alternate universe is born and another time line begins. Also there are an infinite number of universes available.