- Event Horizon
The mystery of planet nine deepens as a new theory from Amir Siraj and Avi Loeb of Harvard attempts to explain what exactly might be hiding in the oort cloud. A primordial black hole? Or. The suns lost twin? Was the Sun a binary twin and is that twin our planet nine?
The Case for an Early Solar Binary Companion https://arxiv.org/pdf/2007.10339.pdf
Amir Siraj website and twitter: https://scholar.harvard.edu/siraj