SR time dilation on remote objects ?

vonroach wrote:
On Wed, 07 Jul 2004 09:56:04 +0200, Bjoern Feuerbacher
wrote:


vonroach wrote:

On Tue, 06 Jul 2004 14:34:51 +0200, Bjoern Feuerbacher
wrote:



And this is still irrelevant for cosmology.


Can a galaxy moving through the cosmos at 1/2 the speed of another
galaxy claim to be older?

Speed relative to what?


The other galaxy as I read the interrogatory.

Sorry, but "a galaxy moving through the cosmos at 1/2 the speed of
another galaxy relative to the other galaxy" makes no sense.


You can use either rotation or translation.

From the context, translation was meant.


(`1/2 the speed of another' is a comparison
of one relative to the other speed?)

I didn't want a comparison of the magnitudes of the speeds. I wanted
to know relative to what the velocity is.


Bye,
Bjoern