Bhuvnesh Jain of the School of Arts and Sciences commented on a new theory that Planet 9 may actually be a tiny, primordial black hole: “From a theoretical standpoint, it’s exciting even if its plausibility right now is early to judge.”
https://www.nbcnews.com/mach/science/our-solar-system-s-mysterious-planet-9-may-actually-be-ncna1061516 NBC News