Near light speed travel, and time dilation, can be a form of time travel. However, I don't think that is what Janna has in mind. <br /><br />Like it says in the other thread about time travel, there are several paradoxes that arise with going into the past. Personally, I think it is impossible to go into the future, because it hasn't happened yet. Unless you want to argue that the entire existence of the universe is already predetermined, and our future has already been decided. Otherwise, it is most likely only possible to travel into the past.<br /><br />The grandfather paradox can be solved in two ways. One, is that when you leave this exact time, you leave this universe and enter into a parallel universe. So, when you kill your parents, or destroy the world in the other universe, it won't have any affect on this universe. You can happily travel back to this exact time with no consequences. The other way of solving the grandfather paradox has come fairly recently I believe, through models of quantum mechanics. Some physicists believe that the past is impossible to change, since it has already happened. If you are 100% positive that your father is alive and well in present day, it will be impossible for you to go back and kill him, something in some way will prevent you from killing him. So, this means that we could only go back in time to observe the past, not change it. <br /><br />I believe that time travel is possible, I just don't know how or when. Although, I am not sure what we can really benefit from it. Yes it would be cool to have the power to time travel, but what happens if we were to off set the balance and alter the fate of the universe?!? <div class="Discussion_UserSignature"> <p> </p><p><strong><font color="#ff0000">Techies: We do it in the dark. </font></strong></p><p><font color="#0000ff"><strong>"Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That's relativity.</strong><strong>" -Albert Einstein </strong></font></p> </div>