text: does the equation for time dilation show dilation occuring for all speeds, whether slow or fast? explain?   thats like asking do cars have feathers  time dilation is because of mass , speed is the affect  of the cause ie mass, time dilation is a perception  ,a theory ,fast and slow are not equal to stopping and reversal as would be nessitated for time travel to have relivance  appart from that remove mass there is no time ,time is not relitive in the spirit world ,because mass is non egsistant