Astro Boy

No it's not possible to travel in time since there is no future and no past just present and even the mathematical side of it it's will never be a reality since infinite amount of energy is required to accelerate something at the speed of light that will help to slow down time on traveller's side thus allowing him to technically travel in future since the rest of the universe will continue running at it's normal speed. Time travel will stay in Holywood studios and in people imagination forever.