I will explain why lisper's explanation of light speed is wrong. The fundamental problem is that it violates the premise of relativity and is a classic example of appealing to an absolute frame.
Velocities are only measured relative to other objects. The explanation given by lisper requires an absolute reference frame. Otherwise, you have no way to figure out how much you're actually moving through space, and thus, through time because you can never figure out your "true" speed.
Relativity tells me that no matter what speed I travel at, I will experience time at the same rate. From my frame of reference, I will perceive things to happen in other reference frames at different rates. When we calculate time dilation and length contraction, we're determining that if something took time "t_a" in Frame A, it will appear to have taken time "t_b" to an observer in Frame B.
Furthermore, it's impossible under relativity to have a frame of reference that moves at the speed of light in any other frame.
Velocities are only measured relative to other objects. The explanation given by lisper requires an absolute reference frame. Otherwise, you have no way to figure out how much you're actually moving through space, and thus, through time because you can never figure out your "true" speed.
Relativity tells me that no matter what speed I travel at, I will experience time at the same rate. From my frame of reference, I will perceive things to happen in other reference frames at different rates. When we calculate time dilation and length contraction, we're determining that if something took time "t_a" in Frame A, it will appear to have taken time "t_b" to an observer in Frame B.
Furthermore, it's impossible under relativity to have a frame of reference that moves at the speed of light in any other frame.