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Stella traveling an immense semi-circle at the tangential speed of 0.8c, and returning to earth.--
We admit that the rocket can withstand these terrible accelerations,
and Terrence observes that the U-turn takes place in 40 hours.
For Stella, the clean time is shorter, only 24 hours.
The effect is absolute.
Once this is understood, we see that it all fits together very well, and that there is no need to imagine useless unicorns.
But what happens during this U-turn for Terrence?
He ages by 40 hours, and observes that his sister ages by 24 hours between the moment she begins the U-turn, and the moment she completes her U-turn.
FOR Stella, it's exactly the same thing, when she begins her U-turn, her clock marks 9 years, and she sees over there (direct-live) Terrence's clock marks three years.
When she finishes her U-turn, she has aged 24 hours, and she sees the earth clock which still marks three years (plus 40 hours).
Nothing special happens.
And those who say that something is happening (like gap-time) are morons who don't understand the theory.
Being an idiot who doesn't understand doesn't matter, personally I remained an idiot for decades before I got the hang of it and was able to write an SR of perfect logic and perfect beauty.
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