Yes and no . Traveling at the speed of light is impossible for anything with mass . If you were to actually travel at the speed of light time would be 0 for you and you would reach your destination the exact same time you left , even if you traveled billions of light yearsbut that would require an infinite amount of energy . But , if you were to travel very close to the speed of light , say , 99 . 99999 % SoL time would slow down you could travel millions of light years in only a few years for you . Millions of years will have passed for everyone back on earth watching you leave , but it would only feel like maybe 10 years have gone by on your spaceship . It ' s called time dilation and was prediction by Einsteins general theory of relativity , and turns out to be very real .