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From our point of view in our Galaxy, his center, Sagittarius A, is a super massive black hole. At event horizon of this singularity, gravity stop time. Is there any reason why time would not run in reverse, on the other side?

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    See the upper left spacetime diagram in MTW, Fig. 32.1, we do already have a bunch of postings on that subject. – Yukterez Jul 19 '23 at 02:59
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    It is not gravity which stops time, it's rather mass which expands time. To think in term of flow of time or speed of time is a human perception bias, an illusion. In which dimension a speed of time would be measured? – dan Jul 19 '23 at 06:04

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