At one time when contemplating time travel and the effects of light speed on matter, I came up with as most do when thinking about this kind of thing, the light-year long pole hypothesis.
The postulation goes something like this.
If you were to build a pole of immense strength, of the densest of materials you could make an object from. Then if you were to make this pole very very long, say from here to say one light year away.
What would happen if you pushed one end of the pole, in your mind’s eye the other end of the pole would also move as you pushed, this way you could send information faster than light….
The reason this doesn’t work is due to the fact that information in the traditional sense does not travel faster than light. So when you push at one end of the pole, the information has to travel down the pole and you get something called a compression wave down the pole, if you like when you push the pole what you are doing is sending a wave down the pole to the other end.
The following youtube clip using a slinky demonstrates this very very well. Notice how the slinky appears to be completely stationary at the end with nothing to keep it up…. That is because it has not yet received the information that it is falling.