I have been curious about this one for a while, if you push one end of a metal rod, doesn't the other end move at the same time? cause if you have a light-year long rod don't you just need to push it to send signals that are faster than light..... is there some kind of light speed wave that runs through the rod when you push on an end? Please Register or Log in to view the hidden image! I got another question too for ya: you've got a rocket ship that can travel as fast as light, you take off near a huge clock, you also have the greatest telescope in the world pointed out of the back of you r ship, you blast off at the speed of light, you look back at the clock and time has stopped, a book I read said this is a good example of time traveling, but if you go back to the clock at a regular pace don't you just come back to the time you were at before and not time travel at all???