If you are going fast enough, time will be slowed down. I have two questions about it: 1. If someone takes a videocamera in a spaceship and let him filming while sending the film with lightsignal, will the video be slowed down or will you see it at the same speed as the man who is filming it? 2. If you will see it on the same speed as the man who is filming it, than you can see in future. Now you kill the man who is filming it. That means that there are 2 almost the same worlds. And why it isn't one world: if you go back in time and kill yourself, than you have never been back in time so it can't be right.