[adolph]

If the gravitational effects leading to inferences of a large extra-neptunian object were a “primordial black hole” would it still count as a planet?

But if not a planet, then what? Scholtz suspects it could be something even more exotic: a primordial black hole, one forged in the big bang.

https://www.newscientist.com/article/mg24933280-100-is-there...

https://en.wikipedia.org/wiki/Micro_black_hole