"Planet Nine" believed to possibly be a primordial black hole?

WTF? That's one I haven't heard before.

Scientists propose plan to determine if Planet Nine is a primordial black hole
1 day ago

Harvard-Smithsonian Center for Astrophysics


Scientists at Harvard University and the Black Hole Initiative (BHI) have developed a new method to find black holes in the outer solar system, and along with it, determine once-and-for-all the true nature of the hypothesized Planet Nine. The paper, accepted to The Astrophysical Journal Letters, highlights the ability of the future Legacy Survey of Space and Time (LSST) mission to observe accretion flares, the presence of which could prove or rule out Planet Nine as a black hole.
[link to phys.org (secure)]