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CSfilm, the thing that has always bothered me about the twins paradox is not that the stationary one gets older. I've done enough physics to see that, and I'm quite comfortable with time dilation.
The thing is, it seems to assume that the Earth is an inertial FoR. I don't see why the twin in the spaceship doesn't see the earth accelerate away from him, then fly around a bit and come back. From his FoR, shouldn't the Earth twin be 49 years younger?
For a more intuitive scenario (in that it doesn't appeal to our intuition that the Earth is an inertial FoR), what if the twins were both in rockets, and they both flew away from each other and back? What if one flew off and the other didn't?
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Strewth
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