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If time is relative, how can we say the known universe is 13 billion years old. Wouldn’t different parts of the universe been in existence for more or less time? Is this relative to us? Or an average? (self.askscience)

submitted 10 months ago by SuckMyWang to c/[email protected]

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[–] SuckMyWang 1 points 10 months ago

I’m probably missing something you explained in your reply but if I were sitting on the edge of an event horizon and was holding a stopwatch and I was watching someone outside of the event horizon holding a stopwatch, and we synchronized our start times, I would see their stop watch go for example 10x faster - theirs would say 1 minute and mine would say 6 seconds. Wouldn’t that make my relative/actual? time much slower making my universe only 1.4 billion years old and theirs 13.7billion years old. I think I’m having trouble understanding the difference between relative and actual