Tres Juicy, on 22 December 2011 - 08:30 AM, said:
I think what he means is that it is impossible for the observer to notice any difference in time within his local frame
Makes sense. The time will never change for the observer within his local frame but only against a reference point based on the speed at which the subject travels.
The "Twin Paradox" resultant from Einstein's special relativity theory answers these questions rather well.
URAIN, on 20 December 2011 - 06:26 AM, said:
Time dilationpostulate says faster an object is moving, the slower time progresses for thatobject in relation to a stationary observer.
Assume a person travelingat the speed of light.
Then does it say there is no time?
Assume a person travelingat the speed of light.
Then does it say there is no time?
Time would still exist for the person as the subject travelling does not notice the effects of time dilation, these are only noticeable when compared to a stationary reference point. Although in reality for someone to travel at the speed of light would break many laws of physics as we know them.
As for the validity of time dilation, to put it quite simply, if time dilation was not taken into account; the current GPS systems would never work because due to the satellite's speed time is "slower" for the satellite.

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