Observer A and B are at the same "depth" in a gravity well. Observer B then descends into the well.

Jamir Melendez

Jamir Melendez

Answered question

2022-05-10

Observer A and B are at the same "depth" in a gravity well. Observer B then descends into the well. A will observe B's time as going slower than their own. B will observe A's time as going faster than their own.
What happens if B were to ascend the well back to A's depth, would B's local time speed back up to the same rate as A's, but B would be younger (relative to A)?
What about the paradox caused by relative motion (ignoring gravity)? If A is moving relative to B, A and B will both observe the other's time as going slower. If A and B were together initially, then B moves away and returns, do their clocks agree?

Answer & Explanation

Blaine Andrews

Blaine Andrews

Beginner2022-05-11Added 20 answers

Calculations show that younger will be the observer who suffered accelerations/decelerations.
Derick Richard

Derick Richard

Beginner2022-05-12Added 4 answers

Answer to the first question: yes, B will be younger than A.

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