Time travel is impossible, because it is impossible to change destiny; contrary to what some believe. Destiny is absoltue, but the roads leading to desinty are infinite. Death is the destiny of every human being. Some where in time you have died. Can you ever travel to that point in time to prevent it, of course not. The fact of the matter is that you are dead some where in time. It is not a matter of will it happen, it has happened, but how you got to that point no one knows. But it can not be changed, that's destiny.