Marty's mother would have married his father even without Marty'sheroic efforts to make sure it that it happened.Is time travel the stuff of legend? Actually (and rather pleasingly), contemporary philosophers take the possibility much more seriously than you might think. Since it is generally considered that modern physics doesn’t conclusively rule out the possibility of time travel, room has opened up for philosophical speculation about what the possibility of time travel would mean for us as human beings. If time travel is possible after all, much of what we ordinarily assume about free will, causation, and time itself will turn out to be false.Could you go back in time and, if you were so inclined, kill your own grandfather?

read more: Time travel and the grandfather paradox