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phymath7

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- TL;DR Summary
- Einstein' twin paradox offers a solution when one of the reference frame is non-inertial.What if both are inertial?

In Einstein's twin paradox,the solution comes like this: The twin on the spaceship de-accelerates his spaceship first and then accelerates in the reverse direction.This means his reference frame is not inertial hence he doesn't measure greater time interval as the other twin does. 1.If the reference frame of the twin on the spaceship is non-inertial to the other,then isn't the reverse also true?(meaning both reference frame is non-inertial to each other) In that case how do we conclude who measures greater time interval?(seems like a new paradox to me ) 2.If I am wrong,(means only one of the reference frame is non-inertial) then is it necessary for the twin on the spaceship to return back to see who is older?What if he doesn't de-accelerate and then accelerate in the reverse diretion(rather he sends some light signal to the other twin)?

**This implies his reference frame isn't non-inertial .**Then how do we get the solution ? 3.If it's not possible to know their time interval by sending signal and if the twin on the spaceship doesn't change speed hence velocity,then is it that we can't actually say for sure that who is older? Will that remain unknown to us forever unless they meet?
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