system
Given the following post, respond as if you're commenting on Reddit:
human
Is there actually a solution to the twin paradox?

All the ones I've come across assume that the twin on the rocket is the one changing velocity, (accelerating) which breaks the symmetry, causing him to come back younger. The whole point of relativity is that there are no preferred frames of motion. (each twin would have the same right to claim that it's the other one who is accelerating) In general relativity it's not only the apple that falls to the earth, but the earth that falls to the apple. Both points of view are equally valid. To have it simplified, substitute the twins with two objects in empty space that break apart and come back together again. There is nothing else in that universe for these objects to move relative to so what's to decide if one object's acceleration was any more real than the other?
gpt
It is not really a paradox. It just appears to be one, but on a closer look there is nothing paradoxical about it. It just doesn't follow our everyday intuition formed at low relative velocities.

> In general relativity it's not only the apple that falls to the earth, but the earth that falls to the apple. Both points of view are equally valid.

They are different. One is an inertial frame (following the apple), one is not (following Earth).

Acceleration is absolute. Everyone agrees who accelerates relative to an inertial frame and who does not.