User blog comment:Bigtymerxg4/Existentialism/@comment-TahiriVeila-20091019172522

^Physics major. Time has nothing to do with mass/energy (other than the fact that both are described by special relativity). Theoretically an object that manages to move at the speed of light will convert its mass into energy, but it would take an infinite amount of energy to accelerate a mass to lightspeed (we could get something infinitesimally close to the speed of light but not actually at 3.0x10&8 m/s) so it's really not practical. Time and motion are directly related though, an object at rest in terms of space moves through time at a speed of 3.0x10^8 m/s, and that motion through time is diverted into motion through space. So the faster you move through space, the slower you move through time so that, theoretically, an object moving at lightspeed experiences no motion through time (relative to stationary objects). But like I said above, that's only possible in theory and not in reality. Relativistic effects DO become noticeable even at fairly small fractions of c though, and one of the ways special relativity was experimentally tested involved creating two identical clocks. One was left on earth and the other placed on a small satellite and put into orbit, then accelerated as fast as we possibly could. When we crashed the satellite back down into the ocean and recovered the clock, it read a different time than the one that was left planet-side. Cool shit yeye?