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There was a recent paper that showed it is possible planet 9 is a primordial black hole - would that work?

https://phys.org/news/2019-09-planet-primodial-black-hole.ht...

No, that paper says "What if Planet 9 is a Primordial Black Hole?" and then works out some consequences and finds them to be not ruled out. It doesn't start from observations and arrive at the PBH in any natural way.

To judge for yourself hour serious the authors are in proposing a primordial black hole to explain the anomalies in the outer asteroid belt, I refer you to figure 1 in their paper: https://arxiv.org/pdf/1909.11090.pdf

Would you pass an opportunity to include illustration of an astronomical object at a scale of 1:1?

I stared at that figure for about a minute and wondered at how friggin' satisfied they have to have been about it.

It was and is really neat, even if the likelihood of its reality is low.

Right - that's why I worded my sentence "it is possible planet 9 is a primordial black hole"

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