More likely there is a primordial black hole out there casuing the observed gravitional anomalies. If there was a large planet or brown dwarf it would have been spotted by now. This idea started catching on institutionally last year.
But what if this mass is like a translucent hologram and doesn't show up til its right up on us.
Pretty close to the description of a black hole. If a jupiter mass primordial black hole was out there it wouldn't be much bigger than a beach ball.
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