What is Planet Nine? with Harvard’s Amir Siraj

• 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?
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  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

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