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If you were on one of those planets orbiting a super massive black hole (ala Interstellar), where time is moving more slowly, would you time astronomical events differently or even the age of the universe?

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Time dilation is related to differences in gravitational potential in General Relativity.

Observing a clock situated deep in a potential well, a distant observer would see it running slow. Vice-versa, an observer looking outwards from within a deep potential well would see distant clocks running faster.

The situation is complicated by orbital motion. This results in a time dilation that would be predicted by Special Relativity. Any relative motion will make a moving clock appear to run slower to an observer in a stationary frame.

To keep things simple, a stationary observer at a radial coordinate $r$ around a non-spinning black hole, would observe events far away from the black hole speed up by a factor $(1 - r_s/r)^{-1/2}$, where $r_s$ is the Schwarzschild radius (and is the smallest radius at which a stationary observer could possibly exist).

However, you would only make incorrect estimates of durations and ages (by using times on your own clock) if you didn't understand General Relativity.

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