im not trying to be a total geek and shit, but first off, matter cant be turned to light, or the other way around. also, the whole thing about if you go as fast as the speed of light thing, number one, nothing made of matter can travel at the speed of light because things made of matter respond to gravitational forces, which includes all stars and planets, thus making anything with mass and therefore being matter unable to reach the speed or light, which has no mass. finaly, even with the speed of light, a destination would not be reached immidiatley, and time would not stop for you. light has a speed, it takes around 8 minutes for light to come from the sun to earth, also, stars that are light years away are the distance that light travels in a year from us. this shows that light does not get from point A to point B immediatly, it travels the distance at the speed of light.
the wormhole thing is a real theory
AS my closing statement, i would like to say that im mad at my self for typing this much about time travel and light physics over a picture of an exercise machine