text: will it ever be posible for men to travel at the speed of light?   yes.  though it depends on what you mean by "moving"  if you mean getting from one place to another as fast or faster than light, it is possible though not currently provable.  there are a few "workarounds" for the light speed barrier.  my personal favorite was cooked up by miguel alcubierre in 1994.  it is called the alcubierre metric, or sometimes the alcubierre drive.  it relies on stretching space time in a wave that would carry a potential vessel faster than light, relative to an outside observer.  it works because relative to the space within the wave, the vessel isn't moving at all.  it also avoids the other problems with light speed travel, time dilation and such.  the problem is no one knows how to build one, but mankind has overcome every obstacle in its way thus far, i think the light speed barrier will be the same.  those saying something is impossible are usually interrupted by other people doing it.  more on the alcubierre metric here:  http://en.wikipedia.org/wiki/alcubierre_drive  - cai