B The twin paradox and black holes

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The twin paradox can apply in the context of black holes, but the specifics of the scenario matter greatly. When two particles fall together, if one accelerates away and later returns, their experienced time can differ due to their paths through spacetime. Observers can compare clock readings at the same event, but their relative velocities can affect perceived time rates. The twin that travels on a non-geodesic path will experience less proper time than the twin that remains in free fall along a geodesic. Thus, the twin paradox remains valid even in strong gravitational fields, such as those near black holes.
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