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Is There a Pristine Black Hole?
Some people think many of the observations that you're describing could be described by a primordial black hole. We can't, in fact, our calculations tell you nothing other than the orbit and the mass. But five Earth masses is big enough to not have evaporated. One idea is that Planet 9 is not a planet and instead it is a five Earth mass black hole. And that's why it's hard to find.