I have been reading up on time dilation a bit this morning, and for the first time, I think it really clicked. Its raised some questions that I haven't seen answered anywhere, so I was hoping someone here could help. As I understand it, and please correct me if I am wrong, the only thing that affects time is our speed relative to other objects. This is why a man traveling much faster will age less from his point of view than he will to others. This is also why you can't exceed the speed of light - because if you get close to it, time slows down for you. You would appear to be traveling near the speed of light to an earthly observer, but would be traveling "slower" than you perceive yourself to be traveling. This is where I see tons of problems, and I assume its because I don't grasp the concept. If we cannot ever reach the speed of light, then isn't the speed of light faster than infinite speed? If I have the means to move some mass as fast as I wanted, time would only keep passing slower and slower, and the SOL would always be faster. This means a particle with mass can move infinitely fast, but still be outrun by light, doesn't it? How can someone 'approach the speed of light'? If a man moving 99% SOL, according to an observer on Earth, really would age more (and I know this has been proven), then less time really would pass for the traveler. This means that the traveler could, in principal, know that he is traveling slower than his observer on Earth measures. Well, if we use the traveler as the stationary frame of reference, couldn't this exact same effect happen if someone on his rocket built a new rocket, and launched off of it going the same direction, with a velocity proportional to the first rocket leaving Earth? Could this go on forever, with each new rocket observing his own speed to be the same as the first rocket observed his to be? Would any of these velocities be any closer to the speed of light than the other? If not, then how is it that we give the SOL a value at all? Or is the SOL that we perceive the same SOL that a person moving 100,000,000 km/h would perceive? If that's the case, then I think I get it. But, this would mean that it isn't really a constant, just a constant relative to every possible observer. Wait a minute.. is that sort of the point of relativity?