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he_who_floats_amogus t1_irhfd1g wrote

Great distance will greatly exacerbate the effects, because the entire universe is expanding. The reason why there's a limit to how far we can see is that there is an event horizon beyond which objects are moving away from us FTL. Relative velocity is proportional to distance.

We've confirmed this experimentally by observing distant cosmological events of known types. At a vast distance, we can observe events that literally function as a cosmological clocks, and can verify that they adhere to the expected time dilation. At a distance that results in relative velocity of 50% speed of light, you'll see events take 15% longer.

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