KAmiKaZiGRuNT wrote If you think it is impossible for forward time travel, then how do you explain the fact that the faster you go, the more time slows down for you. Lets say you are traveling to the nearest star to earth. It is about 4 light years away. You are traveling at light speed. By the time you get back, decades have past for us on earth but only 8 years for you...

Wow everyone already explained that. lol

You can't travel at light speed. The fastest way to get there would be to travel at a constant speed, just under the speed of light. That way, you are not trying to exceed the speed of light so therefore, time-space will not slow you down.