Reverse Twins paradox ???

Austin0

This may have come up before but I havent seen it and dont know the answer.

What if the twins started out in two ships moving together at relativistically significant velocity relative to earth. One of the twins then simply goes to earth and back while the other maintains unform motion.

In this situation who ends up older????

MeJennifer

The one that changed direction and accelerated four times.

vizart

for the worldlines of two observers who meet up at two different events, the one which has a longer Euclidean length between these two events, will have a shorter Lorentzian length, thereby a shorter proper time and consequently the corresponding observer remains younger. draw a diagram.

MeJennifer

Oops, I mean to say that the one that changed direction and accelerated four times is the younger not the older one. My apologies.