Then the rocket accelerates so that it is heading at the same speed back to Earth. This acceleration causes Earth to jump from 9 years to 41 years from the rockets point of view.
I've always taken it that GR would be used to show this "jump". Is that correct?
The phrase "causes Earth to jump from ..." seems to be waving a wand here. If is possible to add just a little explanation? If it is a GR calculation how does the time taken to change direction (and therefor the magnitude of the accelerations) enter into it?
Thanks
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