> 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. =A0Meanwhile, my evil twin stays
> here in his 1G =A0field. =A0When I get back, who is old?

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

- 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

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