I was sitting in my bed thinking about how time can be relative after i heard about those experiments with atomic clocks slowing down on moving objects. My idea is: Since it is meant to be impossible to go faster then the speed of light, then as something moves faster, it should become progressively harder to continue speeding up as you get closer and closer to the speed of light. So if you put a clock, or a person on a train that is moving at half the speed of light. then it means all the molecules of the clock are already moving at half the speed of light, and so any other movement (such as the all the inner workings of the clocks molecules) , would necessarily have to slow down meaning the time measured by the clock or object would slow down proportionally to its velocity relative to the speed of light. So the equation for the rate that an object experiences time would be something like: rate of time experienced by object = (c - v) / c where c = speed of light and v = velocity of object. So as v increases, your experience of time decreases. If v = speed of light then c-v/c = 0 so the object moving at the speed of light wouldn't experience time at all. Can anyone who knows more about physics confirm if any of this actually makes sense please and tell me what to look up if its been written about before or if its just plain wrong lol.