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Travelling at the speed of light?[Question]
#26
RE: Travelling at the speed of light?[Question]
(October 20, 2015 at 8:41 am)robvalue Wrote: @Alex: Thanks Smile 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.
Yes, 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.

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 Smile
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

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Messages In This Thread
Travelling at the speed of light?[Question] - by Heat - October 20, 2015 at 12:30 am
RE: Travelling at the speed of light?[Question] - by Aoi Magi - October 20, 2015 at 12:42 am
RE: Travelling at the speed of light?[Question] - by Heat - October 20, 2015 at 12:50 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 1:10 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 4:45 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 4:38 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 5:09 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 8:55 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 2:43 pm
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 7:15 am
RE: Travelling at the speed of light?[Question] - by Aoi Magi - October 20, 2015 at 10:17 am
RE: Travelling at the speed of light?[Question] - by Aoi Magi - October 20, 2015 at 10:45 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 8:45 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 9:34 am
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 10:54 am
RE: Travelling at the speed of light?[Question] - by Aoi Magi - October 20, 2015 at 12:20 pm
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 1:33 pm
RE: Travelling at the speed of light?[Question] - by Alex K - October 20, 2015 at 7:13 pm
RE: Travelling at the speed of light?[Question] - by Heat - October 20, 2015 at 6:48 pm
RE: Travelling at the speed of light?[Question] - by robvalue - October 21, 2015 at 10:00 am
RE: Travelling at the speed of light?[Question] - by Heat - October 21, 2015 at 7:42 pm
RE: Travelling at the speed of light?[Question] - by Heat - October 21, 2015 at 8:38 pm
RE: Travelling at the speed of light?[Question] - by Alex K - October 22, 2015 at 2:14 am
RE: Travelling at the speed of light?[Question] - by IATIA - October 21, 2015 at 9:21 pm
RE: Travelling at the speed of light?[Question] - by Heat - October 21, 2015 at 9:40 pm
RE: Travelling at the speed of light?[Question] - by Alex K - October 22, 2015 at 5:53 am

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