Since the latest season hasn’t concluded yet, let’s only look at plot holes from 1990 and before.
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IIRC, they’re too big to have formed in one of the ways we know and then continuously lost matter at the the rate they should have.
So one or more of the assumptions about how they could have formed or how they lost matter over time is wrong, right?
Nope. Older than the universe. Can’t weasel your way out of this one science boy
Or we have the age of the universe wrong.