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- Conversely, some might argue that since the traveling twin was moving at near-light speeds, they should be less aged, and thus younger.
This apparent contradiction is the essence of the paradox—so, which one is right?
Neither Is Wrong: The Resolution Lies in Non-Inertial Motion
The key insight is that the paradox hinges on understanding the nature of the twins’ motions. The twin on Earth remains an inertial observer, meaning their motion is uniform—simply stationary or moving at constant speed in a single direction.