Time Travel

I think time travel is possible, and I also think there are many people from the future trying to get into the past, i.e. present (for us). One can argue that if time travel was really possible, could we have not met at least one such person, and quite rightly, the argument is valid, I guess. But think about this, what if time travel is a precision mechanism? What if the scientists need to calculate the precise location of the earth in the space and time in order to time travel. We are not talking about time travel where the earth is prime or center of everything, I mean, think about it, just like we have co-ordinates to find geographical locations on earth, what if there is co-ordinate in space as well (of course there is co-ordinate, in fact there is co-ordinate for everything, just like there always was gravity, we just don't know the measurements). Also, if the Big Bang is true, our universe is constantly expanding, which means, the co-ordinate changes constantly, we don't have that hyper advanced technology to track that kind of measurement. So, there might be people who have time traveled but because of inaccurate calculations, they are just lost in space, and died or burst or whatever in open space.

But then again, there is another concept, the multiverse. What if there IS in fact a multiverse? In that case, time traveler may not necessarily go back to this universe, but into other universe, hence the reason we have not come across with any time traveler from the future. Or, what if there is an abyss of empty space, and our universe is in it. What if every time someone time travels back into the past, a parallel universe is created, to avoid the paradox. This, of course, is pretty much impossible, how can anything be created just like that, out of nothing, but then again, wasn't the universe we live in created out of nothing?