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'Planet Nine' Can't Hide Much Longer, Scientists Say

At the "next one of these [DPS-EPSC meetings], we'll be talking about finding Planet Nine instead of just looking for it," added Brown, who's based at the California Institute of Technology (Caltech) in Pasadena.


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I remember when Pluto was Planet Nine.

10x the mass of Earth. 


What a fascinating concept. Amazing that something so big is so difficult to find. 

Conspiracy theorists have been talking about Planet X, as in 10 (or "Niburu"), for a long time.  But they're going to be robbed of victory by this Pluto thing. 

What specifically in the Pluto thing?

It not being a planet anymore. 

I feel like the concept of planet is arbitrary. Plenty of bodies orbit the sun.