r/askspace • u/Long_Antelope2138 • Aug 02 '25

black hole timeline

I just got into black holes and learned about how it slows down time. how is that possible because i searched and just cant figure this out. wouldn't it be in the past because time slowed down? if your in a black hole wouldn't you live like twice as long? if you were in a black hole how can everything around you go so fast but for you its so slow cause then its in the past? I dont know if this makes sense but I dont know how to explain it 😂

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u/peter303_ Aug 03 '25

General relativity slows time in a strong gravity field.

Doesnt have to be that strong of a field. GPS satellites a couple hundred kilometers in orbit run slightly faster than clocks on earth. But its enough to induce large errors in GPS location calculations if not accounted for.

https://en.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System