[ExI] new ninth?

[Anders Sandberg]

On 2016-01-20 22:36, spike wrote:
>
> OK so we slew one of our planets.  Perhaps we can get a replacement:
>
> http://www.sciencemag.org/news/2016/01/feature-astronomers-say-neptune-sized-planet-lurks-unseen-solar-system
>
>

Would it actually count as a planet? I seem to recall that the 
Pluto-killing definition includes "has cleared its orbit of planetesimals".

The authors also estimate that it might be hard to find: the peak 
probability region for where it currently is is in the direction of the 
galactic center.

-- 
Dr Anders Sandberg
Future of Humanity Institute
Oxford Martin School
Oxford University

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