RE: Travelling at the speed of light?[Question]
October 20, 2015 at 8:45 am
(This post was last modified: October 20, 2015 at 8:50 am by Alex K.)
(October 20, 2015 at 8:41 am)robvalue Wrote: @Alex: ThanksYes, so, the time as measured on a spaceship is shortened by the factor sqrt(1-v^2/c^2) with respect to the time measured on earth and the destination.That sounds similar to something else I heard, that light doesn't actually take X years to travel X light years, because of some weird effect like that. Assuming I heard that right.
In the extreme case of light, there is no concept of how much time passes "for" the light itself. This isn't a defined physical quantity because light has no rest frame in which one could define it...
Edit: oops I had it the wrong way around

The fool hath said in his heart, There is a God. They are corrupt, they have done abominable works, there is none that doeth good.
Psalm 14, KJV revised edition