Martin Hogbin wrote:
> "Hayek" <hayektt@nospam.xs4all.nl> wrote in message
> news:441b6f5b$0$11063$e4fe514c@news.xs4all.nl...
> 
>> 
>> 
>> We have the earth move at 0.6 c through our
>> galaxy, more precisely the earth moves at 0.6 c
>> wrt the average mass distribution of the
>> universe.
> 
> 
> If only life were so easy.  But let us assume that
> it is inertial motion anyway.
> 
> 
> 
>> Galaxus, one of the twins, is launched in a
>> rocket, and accelerates away from Earth till he
>> reaches immoblility wrt to the galaxy, more
>> precisely : immobile wrt the average mass
>> distribution of the universe.
>> 
>> That's it.
>> 
>> According to your viewpoint, will the Galaxus's
>> clock run :
> 
> 
>> 1 - slower than the Earth's clocks 2 - faster
>> than the Earth's clocks
> 
> 
> It depends on whether I am on Earth or with
> Galaxus. The two are in relative motion.  You
> should know by now that Galaxus will measure the
> Earth's clocks to be running slow and observers on
> the Earth will measure Galaxus' clocks to be
> running slow.

We are not observing : we bet on future results, after
inventing FTL radio, for instance.