Planet Nine could be a cricket ball sized Black Hole

Venusian Broon

Defending the SF genre with terminal intensity
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Here's a lovely video discussing the topic, from someone with his proper science boots on, rather than chasing daft dragons. I.e. we've got a long way to go before we can get definitively excited about primordial black holes orbiting us. (TL;DR best bet is that it's just a planet) :

 
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