RussellMc wrote:
>> But relativity says that it could have been the Earth to orbit
>> very quickly around my spaceship, or my spaceship around it..
>> as all is relative and NO ETHER (fixed space coordinates) EXISTS!
>>
>> To me this sounds very contradictory!
>>    =20
>
> 1. Some guy you know more or less cleared that up in something he
> wrote about 96 years ago.
>
> 2. But a key relevant difference is that you were subject to
> acceleration forces to achieve the velocity difference and the world
> wasn't.
>
> 3. Also, fwiw, you will need to travel in a non orbital path to
> achieve useful relativistic speeds,
>
> 4. and if you did find an object that you  could orbit at usefully
> relativistic speeds you would be being subject to continual
> acceleration which may be relevant to outcomes.
>
>  =20
>>  nor asks me to have faith in something?
>>    =20
>
> 5. **Everything** requires faith in something.
>
>
>           Russell
>  =20

So, I take off in a space ship and make 1 circumnavigation of the=20
galaxy, accelerating at 1G for the first half of the trip and=20
decelerating at 1G for the second half.  Meanwhile, my evil twin stays=20
here in his 1G  field.  When I get back, who is old?

Kerry

--=20
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