Planet Nine
The current scientific search for a large planet far beyond Neptune.
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Planet Nine and the Six Orbits That Point the Same Way
Planet Nine is the giant planet Konstantin Batygin and Michael Brown of Caltech proposed in the Astronomical Journal in January 2016, from six distant objects whose orbits all point the same way. This investigation lays out their evidence and what has been added since, sets the survey-bias account beside it, and follows the search to the new Rubin Observatory.