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1 vote
2 answers
143 views

Do black holes have "age" when they form?

I was thinking about black holes, and I know that they form by the death of massive stars. I was wondering, though, do they technically have an "age" when they're born? Do they begin at 0 ...
AdiBak's user avatar
  • 655
11 votes
2 answers
521 views

Could a star closely orbit a black hole long enough for the star to have lost 0.5B+ years to time dilation?

I was wondering how stable a close star-black hole system could plausibly be, and thus how much time a star could plausibly miss out on (from an outside observer's perspective) due to being in an ...
Jacob C.'s user avatar
  • 387
8 votes
2 answers
3k views

Age of a black hole

Is there a way to determine the age of a black hole. Suppose 100 Billion years from now, if two black holes have exactly the same mass(say 30 M☉). One of them formed 10 Billion years from now and ...
Knu8's user avatar
  • 528