RussellMc wrote:
>> So, I take off in a space ship and make 1 circumnavigation of the
>> galaxy, accelerating at 1G for the first half of the trip and
>> decelerating at 1G for the second half.  Meanwhile, my evil twin stays
>> here in his 1G  field.  When I get back, who is old?
>>    =20
>
> Unless we have input from a person skilled in the art of relatavistic
> playing we rapidly get into rubbish answers here. I've done enough
> dabbling to know that I can produce figures that are probably wrong,
> but
>
>  =20
Does such a person exist?  I've never run in to one.
> - At a steady 1 G relative to the non-existent ether you reach C in 1
> year, or slightly less [tm] if you don't have infinite propellant,
> thereafter you travel at about C.
>
> - Your evil twin is scattered molecules millenia ago. Deep-ending on
> how close to C you managed, you are youngish.
>
>
>
>     R
>  =20
At the halfway point, just about the time I switch between accelerating=20
and decelerating, I pass close by another Earth-like planet.  I see an=20
astronomer on that planet observing me as I pass.  I show him my clock=20
and he shows me his.

When I compare my clock to his, is his running faster, slower, or at the=20
same speed?
When he compares my clock to his, is mine running faster, slower, or at=20
the same speed?

Kerry



--=20
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