Does Time Exist at the Speed of Light??? I do not want to "speculate" but to me, if Light has a frequency and frequency is defined as 1/s or Hertz, then how can time not exist at c, when it is used to define a property of the only phenomena we know to move at c (light)? I hope this is a legitimate question and someone can explain this one to me. Simply put - How can light have frequency if time doesn't exist at c? ----- Consider this speculation if you must.... Some "Accepted" Physical theories just are not based on sound reasoning. Is the Only thing constant - the speed of light OR is "Change" the Only thing Constant? I cant imagine measuring light or any motion or frequency without Time, However i can measure time without light. I know this can't be answered with current theory - i just want ya'll to surpass current limitations - they only exist by your definitions!!!