Time travel as portrayed in movies is not science fiction; it's science fantasy.
There are many reasons I make this claim. The first has to deal with the actual science as we understand it- but I'll skip that for now.
The reason that intrigues me the most, and prompts this post, is spacial displacement. The earth is not the center of the universe; even if it were it rotates on its own axis. The earth moves around the sun which rotates around the center of our galaxy which is also moving through space. AND space itself is expanding.
Because everything is moving all the time ANY time travel would result in an arrival somewhere other than the desired location. Marty McFly wouldn't have ended up in Hill Valley of 1955; he would have ended up breathing vacuum in the Oort cloud.
This, of course answers Stephen Hawking's question "if time travel is possible where are the time travelers?" They're floating in space somewhere FAR FAR away.
On a plus side: unless you are able (and want to) do some SERIOUS math you can always answer "Do you know how fast you were going?" with an honest "No, Officer, I do not."
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